Precision laser cut from 3/8" thick mild steel, our header flanges are manufactured in the U.S. These header flanges are specifically made for the GM 3.5L L52 (Vortec 3500) and 3.7L LLR (Vortec3700) I5 engines. This flange has oval port dimensions of 1.715" and 1.175" at its widest points.
Port Size: 1.522"
We carry over 250 different header flange designs, so if you don't see the flange your looking for, talk with one of our tech reps about custom header flange cutting.
Flanges Sold Separately
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