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bluebird
Cochise

USA
292 Posts

Posted - 05 Oct 2017 :  7:40:42 PM  Show Profile  Reply with Quote
So I recently had a 455 zero decked. It has forged rods and pistons. When it was done there were different distances to deck from each piston. Some under by -.001 some over by + .001. I plan on running Edelbrock performer RPM heads. What would be a good compressed head gasket thickness for this build?

"Experience is the best teacher, unfortunately, it's the costliest!"

Steve C.
Crazy Horse

1675 Posts

Posted - 05 Oct 2017 :  8:11:14 PM  Show Profile  Reply with Quote
Interesting subject,Deck height variations between cylinders.

Here is one conversation on the subject, might be of interest...

http://www.hotrodders.com/forum/deck-height-variations-between-cylinders-206872.html

On my previous engine they were all out of the hole just a hair.Not enough to be concerned.

There are various opinions on how to make everything come out 'right'. Some square up the block corner-to-corner first. Then measure and order custom pistons with the appropriate wrist pin compression distance to work out with the actual measured stroke and measured rod length.

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bluebird
Cochise

USA
292 Posts

Posted - 05 Oct 2017 :  8:18:43 PM  Show Profile  Reply with Quote
Thanks Steve, I will probably go with a .043" compressed gasket.

"Experience is the best teacher, unfortunately, it's the costliest!"
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Steve C.
Crazy Horse

1675 Posts

Posted - 05 Oct 2017 :  8:20:03 PM  Show Profile  Reply with Quote
Butler Performance Inc. - Head Gasket

Manufactured exclusively for BP from the original Fitzgerald dies used for GM in the 1960's and 1970's.

These head gaskets will crush to approximately .045.

A very popular and very good gasket. A rhetorical question of sorts..... if used would it make much difference. I'm not an engine builder so maybe those in the know will comment.

.
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bluebird
Cochise

USA
292 Posts

Posted - 05 Oct 2017 :  8:20:21 PM  Show Profile  Reply with Quote
As far as the machining, he told me something similar but I just gave him the block with rods and icon pistons, I had already ordered.

"Experience is the best teacher, unfortunately, it's the costliest!"
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Steve C.
Crazy Horse

1675 Posts

Posted - 05 Oct 2017 :  8:44:19 PM  Show Profile  Reply with Quote
A similar situation. Many would be very surprised to find if accurately measured the actual installed height for the valves on a cylinder head delivered will not be the same. And you would be very surprised that a few of the touted venders have been off considerably !


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Edited by - Steve C. on 05 Oct 2017 8:45:10 PM
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 06 Oct 2017 :  11:16:03 AM  Show Profile  Reply with Quote
I'm using the Butler gaskets. They did take a re-torque after two heat cycles.
Been a couple years since install. No problems found.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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