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Author Topic:   Ford Compression Ratio
brabbit75
Dirt Full Roller

Total posts: 28
posted September 28, 2005 02:52 PM  
I am running a pretty much stock 351 windsor. I have 1969 windsor heads, no milling, heads freshly rebuilt, stock measurements. The block is a 72 model, decked to zero. I am running Federal Mogul hyper. flattop pistons, with 4 valve relief. stock felpro head gasket. Does anyone have any idea what the CR will be? Thanks in advance for your help.

mike9
Dirt Full Roller

Total posts: 72
posted September 28, 2005 07:57 PM  
the stock 69 windsor with flat tops and the 58 /60 cc heads were rated at 10.7 to one with yours at zero deck i would say 11.0 to 1 or maybe 11.2 to 1

oldfordmod
Dirt Full Roller

Total posts: 46
posted September 28, 2005 11:20 PM  
My compression ratio program gives 10.52 assuming .030 bore, 3.5 stroke, 60 cc heads, .010 deck height and -6 cc valve reliefs with a standard fel-pro gasket. If you have something different, post it and i'll adjust the program.

brabbit75
Dirt Full Roller

Total posts: 28
posted September 29, 2005 06:26 AM  
The bore is 60 over, deck height is zero, otherwise it is the same, I just don't know what the cc is on flat top reliefs of the pistons. Thanks again

mike9
Dirt Full Roller

Total posts: 72
posted September 29, 2005 06:56 AM  
will be very close to 11 to 1

oldfordmod
Dirt Full Roller

Total posts: 46
posted September 29, 2005 08:55 AM  
Mike9 is very close, With those changes the program gives 10.933.

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