CasperCasper

Hi all,

Building an LQ4 with L92 heads. I just measured my piston/deck clearance and find most pistons are .005-.009 above the deck. I have purchased FelPro 1027 gaskets as per this hotrod build :

http://www.hotrod.com/how-to/engine/...ylinder-heads/

The compressed gasket thickness is .039in which means I will have a minimum of .030 quench height between piston and head. This number seems a bit tight for my liking but I couldn't see professional engine builders in hot rod selecting a gasket with too tight a quench height. What do you guys think ? Is .030 quench too tight ? I will also be getting the heads milled (which will effect PTV clearance some). It is of course possible that my measurements are off a few thousands on the HIGH side, none of the measurements are larger then .009. The .009 measurement could be minus .001, plus 0.

Cheers

KCS

iTrader: (20)

I wouldn't run that tight. I'd would have just used a GM MLS gasket.

1989GTA

I would not run a quench that tight. The tightest I have ever run is .036".

KW Baraka

iTrader: (7)

.030" is a bit tight for a street car....but not TOO tight. Race cars run tighter than that but they are built to very exacting tolerances.

If you're gonna run .030" the you'd betty be using 'top-shelf' parts and it needs to be built by someone who REALLY knows what they're doing!

Out of curiosity.....why the need to mill the heads.....what CR are you trying to achieve?

KW

dogsballs

On the tight side, but some n/a gurus say 35thou is spot on