I always have used a 30 degree backcut but just did so no backcut testing to pass on and for my records. I took a 45 year break from doing anything for customers because number one I was only charging 400.00-500.00 per job for mostly friends and burned myself out. Of course when you do your own stuff I do more testing and do my own thing. On the new set of 2.08
Valve heads I’m doing for myself I’m at
[email protected] and pushing
[email protected]. These heads are to hopefully replace an old set of open chamber heads I’m running that I did probably over 10 years ago. Well the set of Speedmaster heads I just did easily hit
[email protected] the i struggled to hit
[email protected] on a set of used Edelbrock heads that had a little work done to them previously. I was ok with that because he’s running a .645 lift roller cam and they recovered nicely at .350 and ended up over 308 cfm with a 2.055 valve. Now another set of used Edelbrock heads with a little work done and I had to really work at getting him
[email protected] and was trying my hardest to up the lower numbers as he’s on running a .565 cam with the heads again nicely over 300 with a 2.055 valve. That’s what made me look at the chamber of the two heads. The speedmaster chambers are definitely clearanced better than the Edelbrock heads which in turn produce better at .300
Lift.