Larger Dia BBC Thin Shim Head Gaskets? - Team Camaro Tech
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post #1 of 14 (permalink) Old Apr 11th, 08, 06:50 PM Thread Starter
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Ron
 
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Larger Dia BBC Thin Shim Head Gaskets?

This is more or less a follow up from my previous thread re "Chip on Lip of Cylinder Bore" discussed here: https://www.camaros.net/forums/showthread.php?t=131421

One viable solution was to install a larger Diameter Head Gasket; but this FIX was not feasible because there does not seem to be any .018" to .022" thick BBC head gaskets that are bigger the 4.370".

So, I'm wondering if anybody knows if Larger Dia BBC Thin Shim Head Gaskets exist or where they might be purchased?

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post #2 of 14 (permalink) Old Apr 11th, 08, 07:22 PM
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Re: Larger Dia BBC Thin Shim Head Gaskets?

This is getting tough, I found a GM gasket # 88961561 for the 572 motor, .030 thick. Still .008 away huh? This is a preflattened wire gasket for cast or alloy heads.
I know this is the extream, but I have heard of guys using a thicker babbit rod bearing on lower end of the rod cap and thinner on the other, thus moving piston up cly , few thousands resulting in More compression?
Other than the gasket company Tim recommend, thats all I know. Over and out.

Don
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post #3 of 14 (permalink) Old Apr 11th, 08, 09:52 PM Thread Starter
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Re: Larger Dia BBC Thin Shim Head Gaskets?

CHUCKLE ))

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post #4 of 14 (permalink) Old Apr 11th, 08, 10:50 PM
 
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Re: Larger Dia BBC Thin Shim Head Gaskets?

I have stacked two .020" thick steel shim 11.5 to 1 CR., 409 "W" engine headgaskets fine as well as hand fit Mr. Gasket's 4.00" bore, .020" thick steel shims for my 406 SB USING good old fashioned Permatex "Indianhead Shelllac Gasket Cement" both time's.

So therefore head gasket fitment issues don't bother me ALL that much!

But I am almost anal about this b/c I retorque them at least three time's over as many days driving back and forth to work and all has worked fine for me!!

pdq67



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post #5 of 14 (permalink) Old Apr 11th, 08, 11:02 PM Thread Starter
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Re: Larger Dia BBC Thin Shim Head Gaskets?

EH-HUMM! - A "W" 409 - You're giving your age away - LOL

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post #6 of 14 (permalink) Old Apr 11th, 08, 11:13 PM
 
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Ron,

My hopped up 409 "W" engine fit down in there like it came from GM on my SB stuff!

Stick and all.

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post #7 of 14 (permalink) Old Apr 11th, 08, 11:26 PM Thread Starter
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Them "W" Engines sure had a sweet looking cylinder head - too bad they never had a combustion chamber - LOL

A buddy, a concision over, and I managed to installed a 430cu w/auto out of his sisters wrecked Monarch convertible into his 57 Ford. Believe me it just did not
Quote:
fit down in there like it came from
Ford on his SB Stuff ))

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post #8 of 14 (permalink) Old Apr 12th, 08, 05:43 AM
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Quote:
Originally Posted by Z15CAM View Post
Them "W" Engines sure had a sweet looking cylinder head - too bad they never had a combustion chamber - LOL

A buddy, a concision over, and I managed to installed a 430cu w/auto out of his sisters wrecked Monarch convertible into his 57 Ford. Believe me it just did not Ford on his SB Stuff ))
430 was a Lincoln motor, , it was big for its day. Did not share anything with a 429.

Don
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post #9 of 14 (permalink) Old Apr 12th, 08, 06:42 AM Thread Starter
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Don:

I don't think this thread is going to get much of a response because I don't believe the item exists; however, I must say - I do enjoy our chats ))

I guess Mfgr's of Head Gasket products assume that you will ZERO deck by milling off .025" then use their .039" composite gaskets as quench in which case Chipping the Lip of a Cylinder Bore would even be more precarious.

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post #10 of 14 (permalink) Old Apr 12th, 08, 08:54 AM
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Quote:
Originally Posted by pdq67 View Post
I have stacked two .020" thick steel shim 11.5 to 1 CR., 409 "W" engine headgaskets fine as well as hand fit Mr. Gasket's 4.00" bore, .020" thick steel shims for my 406 SB USING good old fashioned Permatex "Indianhead Shelllac Gasket Cement" both time's.

So therefore head gasket fitment issues don't bother me ALL that much!

But I am almost anal about this b/c I retorque them at least three time's over as many days driving back and forth to work and all has worked fine for me!!

pdq67
pdq67 you ought to know better than that. I am surprised to see engineering like that from you.

Anyway, You can use a thicker gasket arrangement to fix the chip problem, maybe. But, it will screw up your quench area, lower compression, and not be as strong. I would have the deck milled to make up for the chip. Check the clearances, but the closer you can get on the quench area the better.
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post #11 of 14 (permalink) Old Apr 12th, 08, 08:54 AM
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Quote:
Originally Posted by pdq67 View Post
I have stacked two .020" thick steel shim 11.5 to 1 CR., 409 "W" engine headgaskets fine as well as hand fit Mr. Gasket's 4.00" bore, .020" thick steel shims for my 406 SB USING good old fashioned Permatex "Indianhead Shelllac Gasket Cement" both time's.

So therefore head gasket fitment issues don't bother me ALL that much!

But I am almost anal about this b/c I retorque them at least three time's over as many days driving back and forth to work and all has worked fine for me!!

pdq67
pdq67 you ought to know better than that. I am surprised to see engineering like that from you.

Anyway, You can use a thicker gasket arrangement to fix the chip problem, maybe. But, it will screw up your quench area, lower compression, and not be as strong. I would have the deck milled to make up for the chip. Check the clearances, but the closer you can get on the quench area the better.
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post #12 of 14 (permalink) Old Apr 12th, 08, 09:37 AM
 
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Smile Re: Larger Dia BBC Thin Shim Head Gaskets?

lluciano77,I think GM did it stock back then is why I did it and it worked fine at 11.5 to 1 CR.As for Ford's 383/410/430/462 MEL engines, they were Ford's version of our 348/409/427 “W” engines!And notice the 462 Lincoln here!! BIG SUCKER ta say the least!GM's “W” had a 16 degree head to block/piston top slant and the Ford MEL's a 10 degree slant and both heads had almost NO recesses in them for chambers. Both engines chambers were formed by the wedge that is formed when the piston is slanted.Now, bttt, imho, a chip at the top of a bore is fine as long as it doesn't go down far enough to hit the top ring travel. I'd use a daub of good old Permatex, “Indianhead Shellac Gasket Cement” right there on both sides of the gasket and go IF you don't want to use the darn messy stuff on them everywhere.I say this b/c BB's have deck valve scallops ground in them to help breathing. And they only go down like an 1/8" to maybe 3/16” stock. And I know our BB headgaskets are contoured to miss the scallops.pdq67



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post #13 of 14 (permalink) Old Apr 12th, 08, 09:43 AM
 
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Re: Larger Dia BBC Thin Shim Head Gaskets?

Sorry about that, my 'puter's not working right???

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post #14 of 14 (permalink) Old Apr 12th, 08, 10:07 AM Thread Starter
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Re: Larger Dia BBC Thin Shim Head Gaskets?

It's all in the stew now - lol

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