It's one of the reasons the TFS heads have been so popular for building up stock piston combinations. They could have been flat-top pistons and gotten away with this particular heads/cam combo. When we clayed my TFS heads on my 331 using the B41 blower cam, we didn't touch the TFS relief. There is no relief for the TFS exhaust valve due to the unique angle. In contrast, look in the upper right corner and see the small relief designed for the TFS intake valve with cams over. You can see the rather deep valve reliefs for the regular style, large valve heads. Gateway Classic Cars - Tampa Showroom Ruskin, FL Get a Free Vehicle History Report 1986 Ford Thunderbird Turbo 2dr Coupe 9,495 14,000 165 /mo 106,893 miles Engine: 2. This is a Probe dual purpose piston, designed for heads like the Edelbrock/AFR's, etc. 1986 Ford Thunderbird 14,500 252 /mo 26,535 miles Engine: 3.8L V6 Drivetrain: RWD Price 5,500 below avg. To get an idea of the difference between a TFS head w/ angled valves, and a large valve Edelbrock Performer w/ 2.02 intake valves, take a look at the picture below.
Decent CR for a fun NA combo, and low enough to run a few lb's of boost. I wonder what the compression ratio is on a TFS headed 86 motor?With a stock 86 block w/ flat top pistons and the 61cc TFS heads, you're looking at approximately 9.5:1 with a 0.041 compressed gasket like the motorsport graphites. I found a few threads addressing the issue.
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