Author Topic: When is a numbers matching W72 400 block considered scrap?  (Read 1122 times)

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Offline 1973Formula

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When is a numbers matching W72 400 block considered scrap?
« on: June 29, 2008, 03:26:36 PM »
I am looking at a couple of cars.  One of them has a cracked block that may be repairable.  The other has been bored once, but I don't know how much.  Can you repair a crack on the intake side of the block?  Can you sleeve the cylinders on a 400?  Numbers match on both cars.

Thanks,

Offline brian c

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Re: When is a numbers matching W72 400 block considered scrap?
« Reply #1 on: June 29, 2008, 05:04:26 PM »
Yes you can sleeve cylinders in a block. My 455 has (2) now - if memory serves. As for a crack on the block...where is the crack exactly?? The 400 block I bought off a member here has (2) small cracks where the windage tray bolts go into the block. I've talked with a couple different engine builders - Spotts Performance for one - who said that's a very normal spot for these to go. His suggestion for fixing that is using some threaded rod and cinch it down with a nut (I'll go the extra step and use some loctite on the nut to make sure it doesn't move).

Pics would help at this stage...

1978 Y88, '70 455 HO block bored 0.060, TH350, 3.42:1 gears...Oct '08 Fbodywarehouse Calendar - Woot!
1980 Firebird - no engine/tranny... to be pacecar clone