Trick Flow small block heads
These heads did 685 at about 86-8700 on 345 inches. That was with a fully welded Pro Dominator. At that time, I was using an UD cam that was 288/296 and .640/.640 on a 109, so it was way short on lift, and with that much cam timing it wanted to shift past 9k. So I installed it at 100 and made it a bit better. This was also on alcohol.
That's what cross section it took to get there. No doubt, I made mistakes with these castings. That's why I've kept them. They made 310 on my flow bench with a 2.100 valve.
When I went to the W5 head, I could reduce the at .050 timing all the way down to 274/278 and the only reason for the 4 degree split was alcohol. Had it been on gas it would have been 274/274. The lift was .758/.735 on a 109 LSA in at 105.
The W5 head was far and away better. I even used a 55 degree seat on that. The chamber sucks big ***. The steeper seat helped. Any time you can get away from stock architecture, the better off you'll be.
These heads did 685 at about 86-8700 on 345 inches. That was with a fully welded Pro Dominator. At that time, I was using an UD cam that was 288/296 and .640/.640 on a 109, so it was way short on lift, and with that much cam timing it wanted to shift past 9k. So I installed it at 100 and made it a bit better. This was also on alcohol.
That's what cross section it took to get there. No doubt, I made mistakes with these castings. That's why I've kept them. They made 310 on my flow bench with a 2.100 valve.
When I went to the W5 head, I could reduce the at .050 timing all the way down to 274/278 and the only reason for the 4 degree split was alcohol. Had it been on gas it would have been 274/274. The lift was .758/.735 on a 109 LSA in at 105.
The W5 head was far and away better. I even used a 55 degree seat on that. The chamber sucks big ***. The steeper seat helped. Any time you can get away from stock architecture, the better off you'll be.