HP Estimate

HillbillyRock said:

I thought the Gt40's good heads but have seen they are not the best choice for high hp cars. Is there a junkyard head with good numbers or do you have to go with eddy or afr heads to put up nice numbers? And I am modding the aod, what other tranny do you suggest?

Click to expand...

Don't get me wrong, the GT40's are a good entry level head, but to really move the amount of air, at the kind of velocities you want for those power levels, there's no substitute for a good set of aftermarket aluminum heads. Not to mention the aluminum castings will allow for a little more timing than the iron units, which will help more still.

If it were my money to spend, a set of AFT 165/185's would be cat's meow. I like the Edelbrocks too, but have seen in person 50/50 results as far as their quality is concerned. This was on their earlier Performer and Performer RPM castings though, so perhaps they're built to a higher standard now. Trick Flow's are nice as well, with the accompanying valve train. And I’d top it all off with a Trick Flow intake and call it a day.

A T5, or a 3550 5-speed will put more power to the wheels than an AOD would if you're looking for maximum dyno figures but that's not to say your should be overly concerned with numbers. A well built AOD car with a loose converter and the right rear gear out back will put a hurting on most stick car guys at the track.