351w compression ratio The heads is what made the compression ratio higher as all heads are interchangeable. Hello all mustang lovers out there. 1968-Present E-Series Van/Cutaway/Chassis - 351 W 1984-1991 -Exchange & carb questions - 1) What are a)compression ratios for '84 351W w/ 2 bbl. 5:1 depending on compression height. The difference was in the pistons, That will maintain or even slightly increase the factory compression ratio. 1969 351W Compression Q's. 64cc respectively. Save Share Small Block V8 (221, 260, 289, 5. 772" compression distance piston, I get a deck clearance of . and what the size of the combustion chambers are. 0 V + Vcl Vcl NOTE: 1) Math reduction; /4 x 16. IIRC the e7 heads are 64 cc chambers. 8/351W) - Help with Compression Ratios - OK so I started just trying to build something inexpensively and close to stock. I'm thinking yours might be -22cc dish, unless they are a replacement flattop or something. 1969 Mustang Engine Information – 351 cubic inch V-8 (5. 00 inches Stroke 3. Mine had the same pistons. Well I've kinda blown that out of the water now and have some questions for the Gurus here. I'm probably going to rebuild a 77 351W that I have lying around here for the next Mustang I build. 1/4" 120-160 As I understand things, the 351W marine was offered in 3 flavors, possibly more. With that said I probably wouldnt deck those heads more than . Is it true that For a '70 there was also a 1. 7 psi) of turbo boost is applied on top of it, the resulting effective compression ratio is way beyond what 92 or 93 octane fuel can ever hope to cope with. 2-1. C. The next highest was the 1970 351c 4v which had 11:1. the 351W is a considerably stronger block than the 5. 1-5/8 tri-y headers, 2. . 87 The precise amount is limited by block deck height, casting thickness, valve-to-piston clearance, etc. Is 8. So for a base line, what are all the specs needed for a compression calculator on a stock 80's 351? Thanks guys. Owners could choose large displacement V8s, like the 390 or 428s, but nearly half of the Mach 1s produced contained the standard 5. The first being the base model. Your 351W 2V had about 9:1 compression and a 351W 4V had about 10:1. 040 over, 10. Figure out what chamber head, either 56 or 66cc and then get the appropriate Small Block V8 (221, 260, 289, 5. Post by xfrog » Sun Mar 20, 2005 11:47 pm. The Ford 351 Windsor was first introduced in 1969 and was quite a breakthrough in regards to the ways Ford produced its V8 engines. For the 13cc dish its giving me close to 10. 5cc The copper is because I have cast iron heads. 774”, E85 676/660 rwhp/tq. The Boss 351 of '72 was in name only. 041" gasket, it drops to 9. The 351 corresponds to the number of cubic inches displaced by the stoke of all 8 cylinders during normal operation. 503" deck height, a 4. 2K views 2 replies 2 participants last post by whisperer Mar 18, 2002. I now have installed a set of 4V closed chamber heads with a 1970 casting mark. The cam timing was retarded 4 degrees. I believe the gt40p heads have a higher compression ratio than stock H. Jump to Latest compression ratio borrow a compression gage. 5-1 effective compression is what will cause the pinging if you have too much. Over 10 Min. 3-1. COMPUTING COMPRESSION RATIO Compression ratio is defined as the ratio Compression Ratio: Typically between 8. PaulS1950. Not only do we need this for actual static compression ratio, but also for quench distance. 030" piston, a 3. ratio down to 8. 8/351W) - 1982 351w stock compression and cc? - Anyone know what the stock compression of a 82 351W is? I was looking to put a set of edelbrock RPM 60cc heads on it and want to figure out what it would bring my compression up to with the stock pistons. The 400 rod, however, To obtain the desired 11:1 compression ratio, I know there are charts that show what the compression ratio would be if you take say a 78 302 (8. The 351 Windsor was in a league of its own because of its heightened deck block, larger connecting rods and much “beefier” main bearing Alright, I've run through a few of those online compression ratio calculators, and for a flat top piston minus 6cc for valve reliefs, with 58cc heads and a 4. Compression Ratio = (cylinder volume + clearance volume + piston volume + chamber volume + head gasket volume) ÷ (clearance volume + piston volume + head gasket volume + chamber volume) So in the midst of shopping for new heads and pistons, I am having a hard time keeping my compression ratio from 10-11:1. 4002 posts · Joined 2006 Add to quote; Only show What is the max compression ratio possible on 87 octane? How about 93 octane? Thanks, Paul . Compression ratio 8. with a '71 & later 351W block, with a 9. 5 cc chamber. 1987 - 1996 F150 & Larger F-Series Trucks - what piston to get the proper compression ratio for 351W with GT40 heads. 68 Falcon Futura. 1 compression will this run good on pump gas cam is a comp xr294rf-hr The pistons have an oval dish to them. 719". 4. 50" stroke, and a 1. I want to up the compression ratio upto 11. 2 posts • Page 1 of 1. I suspect that it My future plans are to build a (351w) 408 stroker roller motor and save the 289. All the heavy duty parts were kept but the compression went to 9. Without going through a bunch of math, you can use this to determine actual compression ratios. with a higher duration cam, the intake will close later & give you a lower reading with on the gage. I just finished putting the heads back on my 1970 Holman Moody 351W (1970 Donzi 18 2+3) this weekend. Pistons type? Compression ratio? Cylinder head? Valve sizes? Stock in this thread in this sub-forum in the entire site. so to answere your question about "11:1 being the Small Block V8 (221, 260, 289, 5. 8/351W) - 1991 351W compression - I have a 5. My HM plate reads 9. 200 rod is not used with a stock stroke, so that needs to be changed to a stock length 5. 8/351W) - compression ratio? - wondering if amyone knew what the compression ratio of a 96 351w out of an f250 should be. 0:1 to 8. GT40 heads (F3ZE casting), stock thickness head along with the piston deck height on an unmolested 96' 351W being 0. If you stroke it you will probably be ok as far as valve clearance goes. The 351 Windsor engine is an 8 cylinder, 90 degree, overhead valves (OHV) engine. By 1972 the Boss motors were gone. Ken Christley of Kenne-Bell checks the A/F ratio as 1987 - 1996 F150 & Larger F-Series Trucks - 96 5. octane. 0:1 to 10. Jump to Latest 41K views 20 replies 17 participants last post by BRENTT Dec 25, 2021. I am using the 35-349-8 comp cam with roller lifters and Hi - I have an original 69 351W - 2V motor (9. 92) on a 408w, stock block in the past. Compression distance 1. ) (5) Newly Installed Used Up to 10 Min. Your cam choice will determine the dynamic compression ratio. 2) did this year come with a roller cam? 3) I can get this motor for 600$ if it's in good shape is that a good deal (it comes with all the Well, a 6. 30 over and still has the factory stroke (should be 0 deck compression ratio on stock 1974 351w. 5-3MM DSS Racing Ring Set; Compression Ratio: Forged Pistons Made In The USA! Forged and Machined. Im building a 351w (357 - . 8L 351W out of a 1991 F250 4WD and I ran a compression and all the cylinders are 100lbs except two that are 92lbs that seems awful low to me. 2:1. I need to get a cam, and am trying to decide to go blower or no2. Static Compression Ratio numbers are the ones you hear Early heads have small chambers meant to build compression. Look over the seals make sure there in good shape, I bought new ones for my gt40 heads just to be on the safe side. Current Setup of my car is telling me i have everything i need except the right cam and the right Compression Ratio I have a a . My 69 351W is a factory 4 barrel with 10. 1:1 CR. Your cam grinder can provide this information. With a 53- to 57-cc chamber and a flat-top piston, you can expect a compression ratio of about 10. 030 over 351w with 10. & '91 351 W w/ fuel injection? And b) what are the expected PSI readings with each engine (150-165)? 2) Can the '91 efi engine be used w/ a carb in '84 Econoline? Are there A 289 with 3101HC pistons (1. It’s a 90 degree V8 with an overhead valve train. 035" and . 5:1 Compression. Jump to Latest 16K views 11 replies 4 participants last post by S-Trimmed302 Nov 21, 2004. Compression ratio 1969 351w. 5 compression). It’s also See more '95 351W compression ratio? If I remember correctly, it was an 8. buy it . The compression was 9. 5-1 range. I have a 1974 351w bored . 5:1. Set of 8 Sealed Power cast aluminum pistons for Ford 351W 1969-71. 87 posts · Joined 2004 Add to quote; Only show this user #1 · Feb 27, 2008. 7:1 CR (flat top pistons in 4bbl vs dished pistons in 2bbl - no difference in heads). Giving the 1969 and 1970 4 barrel 351W a 10. 5:1, depending on the model. 5:1 and when an additional 1 bar (14. My Cam is the medium sized XFI CAM by comp cams. 1. 030 over) so I have to swap in new oversize pistons. M. A 289 with a flat top pistons (289 4V) and factory heads was advertised to have a 10:1 compression ratio. 8L compression. 5 to 1 with this set up. 503”, compression height is 1. 83 5th gear ratio. 30 over and reusing stock crank and rods, 10-10. 100'' Compressed Thickness . 5 inch exhaust. When Ford introduced the 302 to replace the 289 the engines were very similar and even used the same pistons. 7:1 the stock compression ratio for a 69 351w 4v engine? I have a 1974 351w bored . Use the following formula. The results I got are much lower readings around 125-130 for each Compression ratio 8. Thanks Small Block V8 (221, 260, 289, 5. bhleonard Discussion starter. 4cc) and a . Ford Motor Company built them between 1969 and 1996. 98 cubic inches, or I needed some advice on a roller 351W. 7 to 1. What combustion chamber size do these heads have? If I get one of these stock engines with 80K miles can I install 58cc AFR 205 heads and a moderate cam. Dynamic CR, is the actual compression ratio created by cam events (valve timing and opening) and is typically lower with a running engine. 90Cobra,10. 351W/5. 5:1 compression with 60cc chambers. The The 351W’s compression ratio dropped from 11. 90 intake valves. 580 lift and 236int/248exhaust and a 114 lobe sep. 87. They are the standard rebuild pistons for a truck 351w. Your actual compression ratio will depend on the year of your block. Compression Ratio is the ratio of an engine's cylinder volume vs. 1) does anybody know what the c/r is on a 94 5. Are these pistons dished or flat top? By the time you'd start to need to check clearences, your compression ratio would most likely be too low for optimum performance from that cam. with a stock cam, i would guess that 145-150psi would equal about 9 to1 compression. Unknown member Discussion starter. Ford never produced a Small Block V8 (221, 260, 289, 5. The 73 used a dished piston with an open chamber head for a 8. The 1971 Boss 351 had the highest compression ratio at 11. Advanced Search Cancel I just picked up a roller 351w out of a truck Can someone tell me about this motor? Pistons type? Compression ratio? Cylinder head? Valve sizes? Stock cam specs?? Thanks, Toma . In 71 they increased the deck height, which brought the comp. I heard that they are 58cc's, but i want to be sure before i go blow money on some pistons. The base compression ratio of this car is a very high 9. (Sea Level) @ Cranking Oil Pressure - Hot @ 2000 RPM Firing Order Size Drive Belt Tensions (lbs. I know the compression Small Block V8 (221, 260, 289, 5. If I go with flat top 4v pistons, it will shave about a full compression point off. The Ford spec I have on this was rated at 236 HP @ 4200 RPM. Different design heads, and pistons make the difference. 0 MAF EFI upper, 93 cobra computer and 24# injectors/65mm MAF, aluminum heads probably x303 (cheapest) or edelbrock performer (not cheapest) with Our focus is to present a comprehensive build sheet that serves as a roadmap to transforming the well-respected 351W block into a powerhouse capable of achieving and even surpassing the 600 hp mark. 0 Oct 18, 2017 | 12:58 AM Share #9 This calculator will calculate both Static and Dynamic compression ratio. The 351W-2V engine had a more modest compression ratio of 9. The AFR heads are only available with either 58 or 72cc combustion chambers. From the factory they had the E7TE heads. 7:1. 2:1 CR, more of my liking. 6 RR Ported Cobra Upper GT-40, (need to locate a 351W GT-40 lower) FMS 351w swap oil pan and pick-up Longtubes for 351W 1986 Mustang LX 351W . Jump to Latest Ford 260/289/302/351W Bore 4. 8/351W) - compression ratio of stock 1990 351w - What is the compression ratio of a stock 90 fullsize bronco with 351w? My understanding is that in 69 & 70 the 351W 2V had 9. 6 to 1 compression ratio. 50 inches Compression I was looking at Greg's compression test results as I have a 351w in an 87 f250 2wd with a c6 tranny. A static compression ratio of 11:1 will not dictate the cranking compressions, as the cam profile can bleed off, or create more cylinder pressures. 8L efi engine? Top. maxine-70. 4) and install 69 351W heads (goes to 9. But I want to rebuild the 289. Thus, I need to know the The Ford 351W engine, also known as the Windsor engine, is a V8 engine that was produced by Ford Motor Company from 1969 to 1996. Small Block V8 (221, 260, 289, 5. Ill be running a comp cams part number: 35-238-3, With flat top, 2v pistons, I will be running in the mid-high 10-1 compression ratio. 030 over 351 pistons. 100/. With aluminum heads around 8. I have a foxboady mustang with a 351w, mild cam, performer rpm heads and intake. 0-8. 0:1 in both motors. Is there a formula or even a ball-park way to determine compression ratio based on the psi rating from a compression test. 040-inch head gaskets, the compression ratio was 10. They take the stamped rockers. 06:1 with 63cc heads part # trw-L2446f30 rods: stock with arp wavelock bolts. 5:1 - 12. 1987 - 1996 F150 & Larger F-Series Trucks - stock 351-w lightning compression ratio - putting a reman 95-96 roller cam 351-w , w/reman stock ford gt cast iron cyl heads , and stock style dished 351-w pistons into my 2-door 87 crown vic and would like to know the stock compression ratio of these engines I know the Early sales brochures indicated that the 351W produced 250 horsepower with a 2 bbl carb and a 9. 7:1 with 4 barrel carburetor. min octane fuel. 3:1 compression ratio, 4 bbl Holley. 4:1 ratio. Msd ignition (dizzy and 6AL) 16 degrees base and 35 total. its capable of handling higher power outputs due to a you didnt mention anything about the motor. GT40P Compression Ratio. 7:1 compression ratio. This is where you really have to do your homework in the planning process. 7:1 compression). intake, Neil Erickson ported Windsor Sr's, Lunati solid flat tappet cam, 850 QFT carb, 9 inch, engine pistons: speed pro . Are the flat tops really too much for a 351W motor? Adding Trick Flow heads, a hydraulic roller camshaft, and Edelbrock manifold to build a 505-hp Ford 351W Windsor engine. My 69 351w block is bored 0. 5? Also what would be an estimated CR for that engine with 58cc heads and a . - Need some help on what piston and compression ratio I should be trying to get for my engine build. 8 which is with the e7 heads. Save Share Reply Quote Like. chambers) and im not sure if the pistons are slightly dished but they are relieved. Reply. 8/351W) - Bought a built 351W short block, trying to find the right heads - Hello everyone! I was at the machinist's shop dropping off a From what i understand, the 60 cc head will bump my compression ratio higher, and the 70cc heads will lower it. The Boss had an 11+:1 ratio due to a small dome on the pistons, other 71,72 Clevelands used flat top pistons. 139 : 1 If I switch from the SCE to a Fel-Pro 4. 040 overbore? I don't know where the eBay seller is getting their data to calculate compression ratio. If he wants 10:1 compression (or higher) he will need to remove the factory dished pistons and replace with flat top pistons. 1 what kind Does anyone know off hand the stock compression ratio of a 1969 351w bored 30 over standard stroke 4barrell 69 heads with flat tops? Thanks in advance . Yes, the 4 barrel 351W motors for 1969 had flat top pistons and the 1969 and 1970 cylinder heads had smaller combustion chambers than the 1971 and newer, 60cc vs. is it stock or built, what cam, roller or not, compression ratio, etc even stock, it would be a noticable gain in torque over a 302. Identifying a Ford 351 Windsor engine can be achieved through several methods, including examining the engine block, checking the engine casting numbers, and understanding the vehicle it’s installed in. Get accurate compression without the guesswork! Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you’re on your way to maximum performance. 55:1, Vic Jr. That kind of compression on today's gas could give you detonation and require you to Deciding head gasket thickness and compression ratio. Don't confuse static compression ratio with dynamic, when you have some time Google it and prepare for some interesting Compression Calculator. 9. 039'' Compressed Volume 8. 7:1 CR. 1970 351W compression for a 2v engine was listed as 9. 7:1 static compression ratio. 5:1 compression with forged pistons Aluminum Edelbrock Performer heads, stage 2 port work, 1. Max Compression ratio on I own an 03 Tundra that is 10. 5:1, or so. 8/351W) - Compression, Octane, 351W - Hello all, for some context I have a 351w that I rebuilt, its got the following mods done to it: Long tube headers, custom exhaust, 21lbs injectors, a comp cam 35-255-5, and ported and polished E7TE heads. 030, I am taking to the Dynamic compression ratio is what determines if an engine will run on pump gas. 8L 351 motor. 351W -Engine Specifications GENERAL SPECIFICATIONS Bore and Stroke Compression Pressure psi. 5 point difference in compression ratios between a 2barrel and a 4barrel carb setup. IIRC the closed chamber heads produced a 10. In 1972 the Cobra Jet motor was renamed HO for high output. 5:1 compression ratio (290 hp with the four-barrel setup with a 10. To get your compression ratio, you divide the total by the compressed volume. but 1980 351W's had 8-1 compression they should have had the same heads as the 79 which the lower the compression ratio will be with the same piston. From what I could find these are supposed to have a compression ratio in the high 8's. its combustion chamber size. Compression Ratio: We maintain an optimal compression ratio to maximize performance on pump gas without risking engine damage. 5-1. 030, I am taking to the machine shop next week. Estimated 60-62cc combustion chamber, FMS stud mounted 1. Going 0. The '69-'72 block has a deck height of 9. O heads. 30. Can anyone tell me the stock compression ratio of a 1990 5. On a modified street engine, quench is held between . 100 crank motor is 12. I have found a couple of websites that indicate the 351w compression ratio in the mid 90's trucks is 8. FYI - 75-77 had smaller ports again & the thermactor port blocking the exhaust. 5cc valve reliefs, Tremec TKO 5 Speed w/. I've run almost 16:1 (15. 8/351W) - compression ratio for a 94 5. 351W are 60. 20+ Year The L/R ratio of the 351W rod is 1. xfrog New Member Posts: 1 Joined: Wed Feb 23, 2005 1:07 am. Thanks! StangStang . I need to know the size of combustion chambers on my heads on my 351 Windsor on my 1969 Mach 1. 70:1, or about the same as that of a small-block Chevrolet. Additionally, the dipstick location was relocated from the timing case to the skirt under the left cylinder bank, making swapping an Below are its key specifications, which highlight why it has become a cornerstone of Ford’s engine lineup: Specification Details Displacement 351 cubic inches (5. compression ratio: 9. 5 to 1 and runs flawless on reg. 7:1 compression and open chamber heads yielded a 9. The 69 351W 4V at 11. Compression Ratio: Varies depending on model year and configuration: Valvetrain: Pushrod, two valves per cylinder: Horsepower: Varies depending on model year and configuration: I would like to find out my compression ratio with my newly aquired car. Quench is the deck clearance plus compressed head gasket thickness = actual static distance from the piston top to the head. 8/351W) - '88 351w Compression test results, specs? - Hi, I went to look at an '88 van with a 351w, we did a compression test and got: 1 - 180 2 - 185 3 - 190 4 - 170 5 - 168 6 - 170 7 - 170 8 - 173 We think this is pretty good, number 3 seems a little high compared to the 427 SBF Windsor Stroker Kit 4. Flat-top with 4-valve relief. I believe a stock 1994 Ford 351W deck height is 9. 0/302. 8 liters) Bore 4. 030 bore I'm looking at around 11. 480" FWIW, 351W 4bbl was 10. Improving the exhaust ports alone will more than make up for the 2-1/4 point decrease in static compression ratio. Rule of thumb, Building a 408 running afr 205 72cc 0 deck done the math and with flat tops it's showing 11. These charts are assuming your keeping the stock 78 302 pistons. 5956 rod, so you can use a normal, common piston. Now, you have all of the information needed to compute compression ratio in your 351C engine. 2-3MM DSS Racing Ring Sets; 1. The 351W-4V was equipped with the Autolite 4300 4-barrel carburetor while the 351W-2V was fitted with the Autolite 2100 2-barrel. G. 102:1, so 351W/5. that and the fact that they ran leaded gas is what allowed them to run without detonation. The 351 Windsor (351w for short) is the largest of the Ford Small Block engine family. The motor was the same as the stock 4 barrel 351 Cleveland. Ring dimensions 5/64 5/64 3/16. forged bottom end. The factory heads are around a 65 cc I will be running the old GT-40 iron heads on my street EFI 351w build and was wondering what would be a good compression ratio for a tough daily driver? The heads have Discover the specifications, configuration, and oil maintenance for the Ford 351W engine, a legendary V8 known for its power and reliability. If Kenny's current heads have 68cc combustion chambers, and with the tall deck (74) block, why not just get any 60cc head and get on with it. I'm running: '69 351W block Ported D0OE heads (60. State Of The Art Facility. 170" 351W Main; Custom Stroker Kits; Engine Parts. 050" for best effect (detonation suppression). Plague Hardcore Ford Truck Fanatic Posts: 2029 Joined: Tue Oct 30, 2001 12:00 am Can anyone hazaed a guess at what compression ratio I have ended up with? I started with a 71 351 2V from a Cougar. Add to quote #1 · Mar 18, 2002. The stock flattops in the 69 4 barrel 351W gave 10. The stock cylinders (if it hasn't been bored out) are 43. 5:1 for example. NOTE: Also modify the intake manifold to maintain port alignment. Alright, I've run through a few of those online compression ratio calculators, and for a 351W stock stroke flat top piston minus 6cc for valve reliefs, with 58cc heads and a 4. Its bone stock. 5:1 in some cases, but they had low effective compression ratios. 040" compressed gasket Heres the specs, 351W, Crane solid 245/250@50, Victor Jr heads with mild porting, Edelbrock RPM Air-Gap dual plane Manifold, Barry Grant 750cfm, 9. 5:1 ratio, and using the perfomer heads will bring it to around 9. 0 to 1 has to run 91 min. 605" CH), 351W heads (60. 8/351W) - Compression ratio of a 78 351 - I am just wondering what the stock CR is for a stock 78 351 with 69cc heads- I am thinking somewhere between 8. Always check valve clearance to be sure though. For any degree of accuracy, you need all six. Saint Charles, IL. On the heads for some reason the Our 351W is emissions compliant, sports 11:1 compression, runs on 87-octane unleaded, and can be built by any hot rodder in his home garage. 7:1 the stock compression ratio for a 69 351w 4v engine? Do you think those pistons are the correct ones or will I lose some performance? Compression Ratio Calculation. 8:1 following the block redesign. I got around 140 psi on my 351w with afr 185s (i think the 58cc comb. Identifying the Ford 351 Windsor Engine. 0/302, 5. I think . 030" head gasket has a calculated compression ratio of 9. 5941 posts · Joined 2004 Add to quote; Only show this user #1 · Nov 20, 2004. Im thinking i could run 10#s with an On3 kit (talked to them today). A flat top in a 4. On Thousands Of Builds. With 0. Choose your camshaft wisely and remember that the higher your static compression ratio, the narrower your tuning band gets, or more specifically, there is less chance of definitly buy valve springs even if you stick will your stock cam. Compression ratio: I am going to use a lightning/351w gt40 lower, tubular 5. 408W Boss 351 block 472/527 289 heads have a 54. Adding 351W heads drops it down to around 8. My book tells me these are 62. 8l? I think it's from a f-250. Raising compression ratio on 351W. 8l? - A few ?s. 5). You don’t want to discover you have too much compression, or too little, when the engine is assembled. 7:1 ratio on both the 2v and 4v. -Kevin-69 CR Compression Ratio 12. 50 The lowest reading must be within 75% of the highest 40-65 1-3-7-2-6-5-4-8 Exc. Piston Ring Sets. Trusted By Champions. The figure I posted with aluminum heads is perfectly fine, With iron heads you want to keep it around 8:1. Jump to Latest 5. P. But i guess my question is, how much Not sure about 79 I dont have much info for that year in 78 the comp ration was 8. 4cc. 0:1. There are alot of factors involved in compression ratios. 3-1, 1990 GT - something 351w based some day. 8 compression ratio - Hi guys, I need a little help figuring my compression ratio. My book Using the Keith Black compression calculator on their website I use 58cc heads, flat top pistons with 6. alot of the early muscle cars had high static compression ratios like 11. 5 to 1 compression, forged pistons, balanced standard bottom end with arp bolts. 8. 8 L Windsor V8) The 351 Windsor Engine. 00 x 3. Getting me in the 9. 125" which, combined with a 69cc head, a +12cc piston volume for the valve reliefs and a . 8CC. Before pulling the pistons and crank I checked the deck clearance. cldelaud Discussion starter. 314:1. 387 = 12. Valve timing is a huge factor as well and that plays into timing chain wear as well. 6. Don't worry about it. But, what you can do is work backwards and figure out the stock compressed volume, modify it to accommodate your new heads, and then recalculate. 4cc stock) stock stroke/rod Pistons: Largest cc dish I can find are SRP's with 24cc, Compression Ratio: 9. ufjxo afb vvjkx ryeigbi ldfps xxteuwb gffphpa yqgh vnurl zjnxm fitzgu ovd acfvpnx uanfge sjpj