A Anonymous Guest Jan 14, 2005 #1 What year did Ford start putting in the larger intake and exhaust valves? I've got a '77 with 1.75 and 1.5" dia. valves. -Chris
What year did Ford start putting in the larger intake and exhaust valves? I've got a '77 with 1.75 and 1.5" dia. valves. -Chris
C CZLN6 2K+ VIP Jan 14, 2005 #2 Howdy Chris: The D7XX heads were the 1st to use 1.75" intakes, up from 1.69" previously. The exhaust remained at 1.38" since the C5XX castings. If you have 1.5" exhaust valves they are not stock OEM. Adois, David
Howdy Chris: The D7XX heads were the 1st to use 1.75" intakes, up from 1.69" previously. The exhaust remained at 1.38" since the C5XX castings. If you have 1.5" exhaust valves they are not stock OEM. Adois, David
