Originally Posted by red65mustang
you can buy a oem approx 3/8" thick 4 hole insulating carb gasket at your local parts store for about $10?....
the Edelbrock 3/8" insulator 4 hole gasket is about $14?
Maybe I overlooked those, but at the time I believe the thinnest,in phenolic I could find was 1/2". 4150 style. The purpose for the spacer was for heat soak, not tuning. But I believe,except for upper rpm's, the four hole insulator/spacer would be preferable for street. Although with a 4-sp, I can work with the rpm's to overcome the low rpm glitch.