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ChevLoRay · 12-30-2003, 05:07 PM

Back in the day, Corvair valve covers were so prone to leakage that GM crafted special "keepers (I don't know what to call 'em) that spread the clamping force out about 1 inch on each side of the bolt. If you will recall, the V-8's had smaller ones that extended about 1/2 inch.

These guys are telling you right about the holes for the bolts. Overtightening them over time causes them to compress the gasket, toward the head. This dimple prevents the cover from getting tight, in spife of the torque that you put on the bolts.

Oh yeah....be careful that you don't break one of those bolts off in the head. They're a b!tch to get out.

Go with the aluminum. It is much better.

Gotta remember that one.

12-30-2003, 05:07 PM	#9
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Back in the day, Corvair valve covers were so prone to leakage that GM crafted special "keepers (I don't know what to call 'em) that spread the clamping force out about 1 inch on each side of the bolt. If you will recall, the V-8's had smaller ones that extended about 1/2 inch. These guys are telling you right about the holes for the bolts. Overtightening them over time causes them to compress the gasket, toward the head. This dimple prevents the cover from getting tight, in spife of the torque that you put on the bolts. Oh yeah....be careful that you don't break one of those bolts off in the head. They're a b!tch to get out. Go with the aluminum. It is much better. Gotta remember that one. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.