Head Gasket Recommendation
05-19-2018, 03:44 PM
#1
Head Gasket Recommendation
Just freshened up my motor (rings, bearings, etc) and believe I have a head gasket leak. Motor is a 440, .030 over, 11:1 compression, pushing 450 to 500 hp. I've always used FelPro P/N 1009 gaskets in this motor, but am looking for a recommendation for something different. Motor holds cranking pressure, but when running is leaking pressure into the cooling system. No migration of other fluids. Anyone have a recommendation for a different head gasket. Looking for approx .039" compressed thickness to maintain the current quench clearance. Thanks.
Update:
I think I figured out why I am having a leak. The last trip to the machine shop for a cleanup hone on this block I had them put a very small chamfer at the top of the bores to aid with ring installation. At .030" over and with the small chamfer I am figuring that the equivalent bore at the deck is about 4.475". The Fel Pro 1009 gasket is only good for a 4.410" bore. It's sealing but not well at firing pressures. That being said I still need to come up with a different gasket since Fel Pro doesn't make one with a bore bigger than 4.410". Any one have any experience with Cometic or Trick Flow head gaskets?
Update:
I think I figured out why I am having a leak. The last trip to the machine shop for a cleanup hone on this block I had them put a very small chamfer at the top of the bores to aid with ring installation. At .030" over and with the small chamfer I am figuring that the equivalent bore at the deck is about 4.475". The Fel Pro 1009 gasket is only good for a 4.410" bore. It's sealing but not well at firing pressures. That being said I still need to come up with a different gasket since Fel Pro doesn't make one with a bore bigger than 4.410". Any one have any experience with Cometic or Trick Flow head gaskets?
Last edited by RBLowbucks; 05-19-2018 at 09:21 PM. Reason: update
05-20-2018, 06:47 AM
#3
Super Moderator
Cometic
05-25-2018, 11:06 PM
#6
Update. I pulled both heads and as I suspected the compression ring on the FelPro's just barely overhangs the chamfer at the top of the bores. I've always used FelPros but this time I'm trying the Cometics. FelPro doesn't make a gasket with the combination of bore size and compressed thickness that I need.
09-07-2018, 12:12 PM
#8
Super Moderator
Update. I pulled both heads and as I suspected the compression ring on the FelPro's just barely overhangs the chamfer at the top of the bores. I've always used FelPros but this time I'm trying the Cometics. FelPro doesn't make a gasket with the combination of bore size and compressed thickness that I need.
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