roller block with gt40 heads.. valvetrain/airflow questions.

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07-10-2013, 07:05 PM

#11

Duncan_GT

4th Gear Member

Join Date: Jun 2011

Location: Indy

Posts: 1,353

Quote:

Originally Posted by spearson712

Yes, this is going in the rx7, running a t5 and my rear end is mazda 4.10 LSD, so I need to rev pretty high to make use of the 4.10 rear through the t5. You guys think the gt40 heads with good springs and a b cam could be usable for that?

Why would you need to rev it high with 4.10's? You're probably going to make peak power at about 5500ish. Steeper gears will get you into the torque range quicker.

07-10-2013, 11:21 PM

#12

tinman

5th Gear Member

Join Date: Aug 2004

Location: Arizona

Posts: 4,103

You have the right idea about gears due to the altitude that you are at. I'd use a 650 CFM carb and jet it about 3 size smaller than what Holley's factory put in it.
With a 650 you will have good throttle response, a 750 won't get you this no matter what jets you have in it.......