390 t0 427?
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Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
390 t0 427?
The original owner and bulider of the engine in my 66
f350 just informed me that he had the block board a stroked to 427. Said he will locate the build sheets and show them to me. I wander is this possable. Or is he full of it. all I know is this truck will burn the possie duels of at a rolling start in 3rd. and will put on a smoke show in 4th gear. It is a 390 by the numbers. can ya bore them that far?
f350 just informed me that he had the block board a stroked to 427. Said he will locate the build sheets and show them to me. I wander is this possable. Or is he full of it. all I know is this truck will burn the possie duels of at a rolling start in 3rd. and will put on a smoke show in 4th gear. It is a 390 by the numbers. can ya bore them that far?
Last edited by arctic y block; Nov 4, 2006 at 10:00 PM.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Not likely. The number of 390 blocks (4.05" bore) that have enough meat in the cylinder walls to bore them .180" to the 427 (4.23" bore) are next to nil. The stroke is the same so you don't stroke a 390 to make it a 427. You might bore and stroke a 390 to 428 (4.13" bore, and 3.98" stroke, done that), but not 427. Me thinks someone does not know much about FE motors and is trying to smoke you. Also just cause he has a piece of paper that says it was done, doesn't mean it was done to that motor or any motor for that matter.
Last edited by Bear 45/70; Nov 4, 2006 at 10:43 PM.
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Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
Ya that's what I thought. Could well be 428. Said they done a lot of mach. work to the block. said he used a 427 or 428 crank and pistons. but cold'nt remember for sure. Said that he was supprized it was still running as it would keep brakeing the hi lift cams in two at the back of the block. I put a stock 390 cam in it and have had no problems. I will move it up to the shop in the next day or so and get the numbers off the block and heads.
Thanks bear
Thanks bear
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