how do I identify the block type of a 425 / 455 ?

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Nov 18, 2007 | 03:20 AM

Aussie67Delta88Custom

Thread Starter

Registered User

Joined: Mar 2007

Posts: 100

From: Hallam, Victoria, Australia

how do I identify the block type of a 425 / 455 ?

And are any better than others ?

My engine rebuilder says the first 455 I gave him is stuffed, but before I let him scrap it I thought I had better ask

Gary T
Oldsmobile club of Australia.

Nov 18, 2007 | 01:25 PM

Oldsguy

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Joined: May 2004

Posts: 10,358

From: Rural Waxahachie Texas

Quote:

Originally Posted by Aussie67Delta88Custom

My engine rebuilder says the first 455 I gave him is stuffed,

Did he say how? Is is not worth repair or not repairable at all? There should be some guys on here that can help you ID an engine if you provide some data for them to go with.

Nov 18, 2007 | 02:51 PM

Redog

Registered User

Joined: Aug 2006

Posts: 3,145

From: Far Northeast Philadelphia, PA

If the motor is stock to the car, I don't think it's a 455. I have no info on a 455 before 1968.

But I could tell you what block you have, if you believe it's a 1967. The only info I have on big blocks in 67 are as follows

1966-67 [390925 block]

1966-67 [389244 block]

1967 [390925 block w/.375 drill spot]

1967 [389244 block w/.203 drill spot]

1967 [389244 block w/.375 drill spot]