Quench question for engine builders
07-19-2010, 03:34 PM
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Quench question for engine builders LS engine quench question-
Putting together a 416cid LS3 engine. This is a hyd roller, pump gas street engine. It has a ported stock LS3 intake manifold and we were shooting for around 11.2:1 compression.
The pistons have ended up .005 below the deck. I know many LS engines like to be zero deck or even above the deck. How critical do you think this is, and how what are we giving up if we run it like this? We're trying to decide if we should get it milled to zero the deck or not.
Thanks for any advise you can offer.
Putting together a 416cid LS3 engine. This is a hyd roller, pump gas street engine. It has a ported stock LS3 intake manifold and we were shooting for around 11.2:1 compression.
The pistons have ended up .005 below the deck. I know many LS engines like to be zero deck or even above the deck. How critical do you think this is, and how what are we giving up if we run it like this? We're trying to decide if we should get it milled to zero the deck or not.
Thanks for any advise you can offer.
07-20-2010, 03:39 AM
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I would cc the heads and do a compression ratio calculation to see where you are with the pistons in the hole using different head gasket thicknesses. You may be pretty far off your target CR and the motor won't run the way you expect it should. BBC pistons are usually domed because of the huge combustion chambers on big block heads and need to be "down the hole" but you need to verify what your engine needs.
