gt-40's, lower and 1.7's=?

[rsw007]

i just installed iron gt-40 heads a ported stock lower intake, 1.72 roller rockers and aftermarket ignition box.
what kind of real world gains do you guys think i shoud see in hp and et's?

 

[88mouse]

stock intake still? If so that is killing you. Get a intake and cam then you will put down some good #'s.

 

[85ragtop]

Moved to talk.

 

[Gearbanger 101]

As it sits, probably another 30hp to the flywheel.

 

[bloopbloob]

stock intake still? If so that is killing you. Get a intake and cam then you will put down some good #'s.

the lower is ported, which is the most restrictive part on the stock intake.

i'm thinking maybe + 25-30 to the wheels

 

[rsw007]

yes i massively ported the lower it should flow 180 plus in all runners. and i opened the throttle body opening on the upper to 70mm

im hoping for atleast 11.3's on the 125 shot

 

[stykthyn]

you ported it or a professional ported it? if you took too much material from the wrong places you may inadvertantly cause reductions in the velocity of the air moving through the runners.

 

[ninety15.0]

Were the heads installed as is...with no work done to them. Valve job? Milling?

The combustion chamber on those gt-40 irons is 64.5 cc i believe...which will drop your compression to under 8.5:1. So without any work done to them i would probably say the heads were only worth 20-25 hp and the intake work is probably worth another 10-20...depending on how well you did the port work. total increase of 30-40.

Those Gt-40's really need a lot of exhaust flow to be efficient...think longtubes, O/R X pipe, and some bullets or SLP's.

 

[rsw007]

you ported it or a professional ported it? if you took too much material from the wrong places you may inadvertantly cause reductions in the velocity of the air moving through the runners.

thats possible about the velocity but the nitrous will make up for that i hope