What heads should I buy then?I agree with General karthief on the gears. That cam isn’t helping your low end either. Lunati rates it from 2000-6000 RPMs making not the best choice for poor flowing GT40p heads.
I got the gears for $100 from a friend, and it’s just a street car at the moment. Will my gears be too short even with the cam power band being from 2-6k?JMO
Do not put the underdrive pulleys on.
Auto trans 373 gear
Stick 355 gear
Will keep that in mind, and I have a twin turbo kit from dna motors but I haven’t heard the best from that company, the kit is new though. Thoughts on it?4.10? 3k rpm at 50mph, not a good time. Really wont notice anything with the pulleys. Id go some sort of power adder... 75-100 shot, or turbo kit.
Will keep that in mind. What heads do you recommend?3.73 gears if you're keeping it relatively "stock". 3.55 or lower if you plan on going whole hog. My H/C/I equipped 5 speed had 4.10s when I bought it and they were too much for the street. Maybe I'll regret 3.73s if I stroke it, but for now 3.73 is perfect.
I agree that pulleys aren't worth the work and "gains".
Have not heard of dna. Its a good amount of work to do. What is your main goal with the vehicle? Certain power level, maybe a certain time you wanna run, or just a fun, quick and reliable street car. I'd work on matching up the top-end to all work well with eachother. Get it taking in the right air/fuel and expelling it efficiently(decent heads,165-170's) and a good exhaust set up. That'll wake it up a good amount.Will keep that in mind, and I have a twin turbo kit from dna motors but I haven’t heard the best from that company, the kit is new though. Thoughts on it?
AFR 165s or Trick Flow 170s would work well and port your lower intake manifold.What heads should I buy then?
Hey Guys, I’m new here so not sure where to post this. I have an 89 GT with Gt40p heads, ported Gt40 intake, and a Lunati cam, .510 lift and 284/292 duration, Subframe connectors and a 75mm throttle body with the egr blocked off and about to put some underdrive pulleys on. The car feels sluggish on the lower rpms, what should I do next. Gears? I have 4.10s I’m installing soon. What should be next
Agreed. You need to have a plan to work toward. Otherwise you'll be spitting into the wind and in time will get discouraged.That cam + 410 gears + twin turbo, now that's a plan.
Look, read up on some of the build threads around here, pay attention to the turbo builds if that is where you want to be.
Are you doing the work yourself?
Got a place to work?
Need help formulating a plan?
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