Hedman Stainless Headers - 1.75 in Primary - 3 in Collector - GM Fullsize SUV / Truck 1967-91 (Pair) PDK 351M and 400M engines mated

351M and 400M engines mated to GM transmissions

and engine rebuilders—and of course into the corresponding products

This is a Series 1 Cooler Mounting Kit

The supplied Holley EFI OBDII Transmission Tuning Handheld is used to adjust Shift Points

gauge can be mounted to fuel regulator or fuel block for convenient fuel pressure tuning

Hedman Stainless Headers - 1.75 in Primary - 3 in Collector - GM Fullsize SUV / Truck 1967-91 (Pair) PDK 351M and 400M engines matedProduct Description: Headers 1. 75 in Primary 3 in Collector Gaskets Hardware Included Stainless Natural GM Fullsize SUV Truck 1967 91 Pair Hedman Hedders, began as a one man shop in 1954. Bob Hedman, founder of Hedman Hedders, sold his highly sought after exhaust tubes to fellow racers on the salt flats of the Mojave Desert. But, what started out as a way to make a few bucks to pay for Bobs racing hobby, quickly turned into the premier hedder