vortec heads- which head gasket? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC 3 · 03-21-2003, 05:58 PM

1970 block, 1997 vortec heads. do I use the earlier gasket or a 96 up head gasket?

thank you

72MARIO · 03-21-2003, 06:25 PM

I have heard you should use the GM steel ones for vortec heads.

rin68 · 03-21-2003, 06:56 PM

i'm using fel-pro 1003, give me .041" quench distance (0 decked block)

Blue68 · 03-21-2003, 07:13 PM

I got all my parts from www.Sallee-Chevrolet.com and would trust them to get you an accurate answer. I do remember they are fel-pro parts.

crazy longhorn · 03-21-2003, 07:25 PM

If the decks of the block havent been cut, the tin shim gasket will give you a better quench distance.......however, if you arent sure if the decks are real flat GM puts out a .o28 thick composition gasket that would be better for sealing, & still keep the quench distance "liveable". ideallly, the quench should be in the .040-.o45 range, but in the real world ,you can live with a little more. anything over .060 on the quench will give you fits, but on a 9-9.5 comp ratio, you can live with .050-.055. good luck,crazyL

03-21-2003, 05:58 PM	#1
GMC 3 Registered User Join Date: Dec 2001 Location: Philadelphia, pa. U.S.A. Posts: 87	vortec heads- which head gasket? 1970 block, 1997 vortec heads. do I use the earlier gasket or a 96 up head gasket? thank you

03-21-2003, 06:25 PM	#2
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	I have heard you should use the GM steel ones for vortec heads. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

03-21-2003, 06:56 PM	#3
rin68 Senior Member Join Date: Mar 2000 Location: East Peoria, IL Posts: 600	i'm using fel-pro 1003, give me .041" quench distance (0 decked block) __________________ 1968 C10 - 383, non-stop project 1969 Camaro - 327, bone stock family heirloom...soon to be LS/T56, Ridetech, all the goodies

03-21-2003, 07:13 PM	#4
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	I got all my parts from www.Sallee-Chevrolet.com and would trust them to get you an accurate answer. I do remember they are fel-pro parts. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.

03-21-2003, 07:25 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	If the decks of the block havent been cut, the tin shim gasket will give you a better quench distance.......however, if you arent sure if the decks are real flat GM puts out a .o28 thick composition gasket that would be better for sealing, & still keep the quench distance "liveable". ideallly, the quench should be in the .040-.o45 range, but in the real world ,you can live with a little more. anything over .060 on the quench will give you fits, but on a 9-9.5 comp ratio, you can live with .050-.055. good luck,crazyL



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