11-06-2004, 09:33 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
427 bore/stroke/piston issues.
4.250 bore on a 427 is actually a .017 over bore. Due to the thin wall casting of a 427 it's pretty common to bore in .003 increments. 4.250 pistons can be purchased via the web, no special order required, in various dome/dish configurations to allow for various compression ratios. Typcial 428 crank in a 427 block (stroke 3.980) requires a piston with a non stock pin height, also readily available via the web.
4.25 bore/3.980 stroke = about 454 cubes.
Nice motor!
NOT saying THIS motor is stroked, just a typcial application found in a lot of 427's.
Last edited by Excaliber; 11-06-2004 at 09:37 AM..
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