400 block bore
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New User
Joined: Jan 2004
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Wow, thanks for all the help. I will stick with the original plan of a .030 overbore. I think I will run the timing staight up, unless it is recomended otherwise. Im hoping to have the truck running in 2 or 3 months, if my budget allows. Ill keep you posted on it.
Post Fiend
Joined: Jan 2003
Posts: 10,323
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From: Montana Territory
I'd recommend .040" over. Why? a very respected engine builder that I know, he says so. HE says so because that will get you truly straight bores. .030" is usually all it takes to clean up, but that last little bit will fix the factory defects. It'll cost you the same for any bore, but call around and get a shop that will torque plate your block. this is very improtant, you are spending a lot of money, they shoudl do it right the first time.
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
In another thread the 427P pistons were listed with 1.63 Compression Height. That brings the Static CR down to about 9.65:1, with 59cc heads and no milling or decking. This in turn will reduce the Dynamic CR to about 7.8:1 with 63.5 degree ABDC IVC. That should give you plenty of cushion to increase the bore or do some milling if required, but I wouldn't do anything that wasn't necessary.
Senior User
Joined: Mar 2004
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That is correct, Danlee, 1.63 compression height on the Federal Mogul 427P:
Pistons: Federal Mogul 427P .030 over (Bore 4.030 / Stroke 4.0)
Data on these pistons:
COMP: (2)1.98mm OIL: (1)4.76mm
COMP DIST: 1.630"; PIN DIA: .9751"
7.9:1 COMP RATIO
RECESSED HEAD .145" DEEP x 3.000" DIA w/2 VALVE POCKETS
Seems to be a good match for the Aussie heads...but I'll know for sure in a week. Will post results. Obviously that 7.9:1 listed above is assuming using factory 400 heads and not considering decking / milling, etc...so I don't confuse anyone.
Pistons: Federal Mogul 427P .030 over (Bore 4.030 / Stroke 4.0)
Data on these pistons:
COMP: (2)1.98mm OIL: (1)4.76mm
COMP DIST: 1.630"; PIN DIA: .9751"
7.9:1 COMP RATIO
RECESSED HEAD .145" DEEP x 3.000" DIA w/2 VALVE POCKETS
Seems to be a good match for the Aussie heads...but I'll know for sure in a week. Will post results. Obviously that 7.9:1 listed above is assuming using factory 400 heads and not considering decking / milling, etc...so I don't confuse anyone.
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