Heads & gas mileage

[Ozz]

I'm looking to add heads to my car, and am wondering what it'll do to my gas mileage.

I currently get 280+ to the tank on the highway w/the blower, intake, throttle body, mass air, and larger pump/injectors.

I'd be adding Edelbrock 6037s (60379).

They claim 70HP and I imagine gas mileage would drop considerably as well.
Any thoughts?

 

[custom89stang]

i dont think its so much the heads, than it is the CAM, my friend got a stage 2 trick flow cam and some matching heads and now he gets 7-8 Miles per gallon, that being said, he dyno'd at 291 RWHP and he runs low 12's

 

[custom89stang]

on street tires......he gutted the back and has 100 shot of NOS..... but his car is quick

 

[Ozz]

Damn, I've got 300 at the wheels and get my 280+. Around town is much less, but still better than 7-8

OTOH, I don't plan on changing the cam either.

Thanks for your input, and it only took about 10 seconds from when my question was posted, lol.

 

[Ozz]

bump