[Mack Daddy]

What do you guys think of the GT40 Aluminums? Worth the $800.00?

[EZBNME]

Depends what the combo is? The GT40Y head can work great. I remember a past (317 or 321) engine buildup in MM&FF using these heads. This engine was said to make 446 horsepower using an rpm extender. It had hand ported Y heads, 10.1 CR, solid roller .600 + lift, GT40 ported lower, Box upper, 36lb injectors, 75 bullet, 75mm TB and A9L. I've seen some fast cars using these heads.
It was to prove better flowing heads are not always needed to make big power.
Intake cfm x .257 x 8 = heads horsepower potential

[GT Dan]

I would not allow anyone to port my heads unless it was either a CNC port job, or a hand port job complete with documented flow numbers. Inaccurate porting without numbers to back it up can result in uneven flows of fuel/air and imbalanced horsepower numbers from each cylinder and unbalanced pressures of exiting exhaust gases.

Leave it as cast by the manufacturer or get a measured port job, but nothing else.

I haven't seen new GT40Y's for that cheap (maybe I'm just shopping at the wrong places I've seen them in the $900 range.

If that is the head that you like get it. Personally I don't like the GT40 heads.

Edelbrock has reworked their Performer and Performer RPM heads. I haven't priced them, but with improved flow numbers (haven't seen the #'s) combined with some of their other desirable features, this might be a good head to consider. They are described as being CNC profiled, not CNC ported. I'm not certain if there is a difference in these terms that they are using. I think that they are certainly worth a look though.