LQ9243 heads gasket question
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Teching In
Joined: Sep 2012
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LQ9243 heads gasket question Hi all I am swapping an LQ9 into my RX7 soon since the LS1 bit the dust. I'm using 243 heads and my cam specs are as follows:
Cam 230/234 .600/.602 111 LSA
I was wondering if I can use .040 cometic gaskets to increase the compression? Or will I have PTV clearance issue? The car will be a daily driver and an occasional track car.
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Cam 230/234 .600/.602 111 LSA
I was wondering if I can use .040 cometic gaskets to increase the compression? Or will I have PTV clearance issue? The car will be a daily driver and an occasional track car.
Modify message
Depends really on how much your heads have been milled
The 230 intake lobe usually clears true flat tops with the .051” GM gaskets and the .040” will clip away at those clearances a bit
IMO if those heads are milled more than .010”-.015” it’ll get pretty close.
Best bet is to measure
The 230 intake lobe usually clears true flat tops with the .051” GM gaskets and the .040” will clip away at those clearances a bit
IMO if those heads are milled more than .010”-.015” it’ll get pretty close.
Best bet is to measure
Thread Starter
Teching In
Joined: Sep 2012
Posts: 23
Likes: 0
Depends really on how much your heads have been milled
The 230 intake lobe usually clears true flat tops with the .051” GM gaskets and the .040” will clip away at those clearances a bit
IMO if those heads are milled more than .010”-.015” it’ll get pretty close.
Best bet is to measure
The 230 intake lobe usually clears true flat tops with the .051” GM gaskets and the .040” will clip away at those clearances a bit
IMO if those heads are milled more than .010”-.015” it’ll get pretty close.
Best bet is to measure
I'm running a 6.0/370/LQ9 with true flat top pistons, 799 heads that have been milled .020", and Cometic .041" head gaskets. My cam only has .558 lift though. No clearance issues at all. You had better check PTV though with your increased valve lift. If for no other reason than piece of mind.
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Joined: Aug 2005
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From: Monroe,NY
I'm running a 6.0/370/LQ9 with true flat top pistons, 799 heads that have been milled .020", and Cometic .041" head gaskets. My cam only has .558 lift though. No clearance issues at all. You had better check PTV though with your increased valve lift. If for no other reason than piece of mind.
Trending Topics
Valve Drop Measurement ? Hi Rex, provide your Valve Drop Measurement, I will use EAP modeling for an EXACT measurement of the distance (PTV)
I would like you to set the camshaft at Split Overlap for the best, largest, PTV.
My choice would be a thin gasket good for better Squish.
Lance
I would like you to set the camshaft at Split Overlap for the best, largest, PTV.
My choice would be a thin gasket good for better Squish.
Lance
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