427 vs 454
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Heel & Toe
Joined: Sep 2008
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427 vs 454
Is there any way to tell the difference visually between a 69 427 and a 70 454 engine without removing the cylinder heads or the oil pan? The block casting numbers can be the same. Thanks for any help.
that's going to be the only external clue. Look at the backside of the balancer- a 454 will have a really obvious lump on the inner diameter.
Team Owner
Joined: Jan 2006
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From: Crossville TN
Casting date code on the block will be different. I don't know the effective date for the switch-over from 427 block to 454 block production, but after a specific production date, all such castings would be intended for 454 use or for spare block production for either engine. There may have been some minor casting revisions done at that time [or not], but the blocks for those engines are essentially the same. As far as 'legitimacy' for a specific vehicle, the casting date for the block would have to be 'correct' for when the car...meaning some weeks prior to vehicle assembly.
Last edited by 7T1vette; Oct 10, 2009 at 09:22 AM.
