the Pontiac exhaust duration question is a misconception- Pontiac factory cams had more exhaust duration since day one 1955, all the way until the last 400 V8 was made in 1979. Mac McKellar found extra exhaust duration made more power, because the Pontiac head has a severely turned down bent port, to accept under car exhaust manifolds, right from the factory. extra camming on the exhaust is 70 year old idea, John Deloran, Mac McKellar, Bunkie Knudsen. look it up. the lift on intake/exhaust on almost ALL Pontiac cams was the same for both valves.
Wish Darin would write a book already, and save me taking notes every time I watch a video with him in it… There more to this conversation? I wanted to hear about the Harley head, as it might be relevant to a current project.
I missed both of the Daren Morgan live, I'll try to make sure I don't let that happen again. When are you going to take your car to the track, nobody would miss that.
Darin,…. 20,000 lbs to open a top fuel valve?? I think That would rip the stem out of the head in 30 seconds or less. 4500 lbs on a pro mod? Im pretty sure its One two many zeros on both those numbers from what i know.
I see, i have to pass, I’ve worked on both of those engines plus more that run those times. None of ours or any friends/competition was those numbers. The rocker, alum head and valve train would be ruined in seconds with 20,000lbs. Think about how heavy that is. Cheers
