Quote:
Originally Posted by art leong
After a few of minutes at idle the intake runners were 105 degrees the head next to the intake manifold was 108. As the head got hotter the runners the runners got hotter to.
I didn't have the temp gun before but I think the runners stayed cooler longer, till they eventually heat soaked.
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It may be too thin; the spacer looks more for a street/OEM application and it may need to be thicker for your application.
Just make your own heat spacer from a thick sheet of Black Nylon 66.