Technical > Matt Shaff's Engine Shop

girdle vs 4 bolt caps on iron hemi block

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noslin:
dealing with iron block on say 331, 354, 392 hemi block.  when do you go to 4 bolt caps or what is better the caps or girdle.   what hp run the girdles to or can you do both?   would be blown, prob 354 but looking for 392... shooting for 7.0 pro.   so 1000, 1100 hp guessing .  i dont know anything about this so looking for insight.

ty
dean

Frontenginedragsters:
Dean:
 The old "Whale" engine was always the foundation of blown fuel racing.
I have a 354 engine block at my shop and there is not a lot of material outside of the main bolt area to add bolts.
I think the girdle is the way to go but lets see what some of the older guys say.
Lots of west coast whale engine guys and years of experience from this group.
I will look into this more and post additional info.

Matt

dreracecar:
There is a company that is making a new 392 block. Added material for the 4 bolt caps, added material on the decks and cylinder walls, all weak spots on a 60 year old block intended for racing. I haven't seen a side bolt girdle that was made for a iron block, only for the Donovan alu block

Paul New:
I had 3 392's and wanted to build an open alky combe to run 6.90-7.0's and Gene Adams told me then lock will not last. He informed me that injected nitro would last at those E.T's

coupemerc:
A buddy of mine is building a dual engine FED with blown alcohol 392s. His engines have 2 bolt mains with girdles.

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