Does anybody know what the stock deck height is on a 9.5:1 L98?

Also the gasket thickness compressed on the stock gaskets.

Thanks!

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1985 Iroc-z, 14 second 305, new engine in the works.

 

9.025" from crank centerline to deck

If you're talking about deck clearance which is what it looks like you want to know about, it's .025" ± .005". Stock gaskets are about .039" thick.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Pulled apart an '87 L-98 a few months back and the gaskets were old-style steel shim gaskets. Those are usually very thin- .018" or so.

If you run the numbers (just did it myself) you will hit a compression ratio of about 9.45:1 with a .025" deck clearance, stock 12cc dished L-98 pistons, 64cc combustion chambers and the afore mentioned .018" head gaskets. That's very close to advertised compression on this motor. Put .039" head gaskets on the same combo you get 9:1 which is very far from advertised.

 

Piston to deck

sorry for confusions.

Dang, so GM didn't screw around with tight clearances...

Spose I'll be deck'n the block

thanks!

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1985 Iroc-z, 14 second 305, new engine in the works.

 

Damon! thanks a ton, very helpfull!!!

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1985 Iroc-z, 14 second 305, new engine in the works.

 

My bad... didn't realize they used shim gaskets in those, most factory motors I've pulled apart have had red Victorcore gaskets.

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"So many Mustangs, so little time..."
ICON Motorsports

 

No bad, all is appreciated.

Ok, say that in building/blue printing an engine the gasket thickness is a variable, are there any considerations with gasket sizes? (not talking compression/quench) Like do thicker gaskets blow? thinner ones? materials they're made of stronger/ weaker?

Give me some gasketology

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1985 Iroc-z, 14 second 305, new engine in the works.

 

Thinner gaskets are usually just a thin piece of metal and have alot more tendency to leak. If you deck the block and cut the heads though, there should not be any sealing problems.

 

Is compression height how I would find my deck clearance with a new set of pistons?

If not, how so?

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1985 Iroc-z, 14 second 305, new engine in the works.

[This message has been edited by tpi_roc (edited December 07, 2001).]

 

Nevermind

figured it out

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1985 Iroc-z, 14 second 305, new engine in the works.