LITTLE KNOWN FACTS ABOUT 454SS SEATS.

The 1st important update to the Chevrolet 7.4L major block motor came in 1987 Using the switch to EFI. These engines were dubbed the L19 and were in a number of Chevy and GMC C/K trucks.A Cloyes timing chain guarantees appropriate rotation even though CNC ported LS3 heads proceed to maintain the pavement stomping aluminum mill respiration properly.