Would I be stupid if I didn't do this?

The 347 would work better with heads and cam suited to it and not a 306.

This might mean different parts and its somthing for you to consider.

If it is in good tune the milage won't be that much different at say highway driving cause the pcm will work to give you the best milage.

Later
Grady
 
BlueOvalStangGT said:
i never asked for 30 mpg but i sure am not gonna put an engine that does 8 to the gallon into my daily driver. every time i ask a friggin question i get awesome answers from everyone except you. :notnice: (vibrantredgt)
YEAH! Vib sucks...(sike)! Calm down dude. Why would you put a high performance motor into your daily driver and wonder about fuel economy in the first place?

Anyway, just to be different I will say no on for several reasons. First is the additional cost involved with buying new heads/cam blah blah. Second, I am a fan of small cubic inch power, now by no means is 347 "large" but I like small 302/306/308 combinations. If you ever plan on drag racing the car, you can compete in a bunch of really competitive classes that limit the cubic inches to under 310. I say keep the 306.

Joe
 
BlueOvalStangGT said:
i never asked for 30 mpg but i sure am not gonna put an engine that does 8 to the gallon into my daily driver. every time i ask a friggin question i get awesome answers from everyone except you. :notnice: (vibrantredgt)
I second that notion... your are never here to help anyone out. You only critize peoples questions they ask and hardly ever help out. How did ya get the moderator position anyways? :D

j/k man... but seriously I'm with Vib... If your going to get betting a high performance engine, then you shouldnt be worrying about the gas mileage. Its just the price you're going to have to pay for the extra power.
 
For many reasons but ones like FFW and NMRA class requirements, small displacement suits my intentions for now so I went with the stronger set up 306 (more forged parts). Later when all out racing is the only thing the car will do, I'll opt for displacement.

Thanks for all the replies. By the way, the guys over on Hardcore Mustangs saved me $250 on my order through CHP.
Wayne
 
There's no real reason that excellent performance can't be had along with reasonably good fuel economy. I'm sure that there are plenty of really fast cars out there that get over 20mpg.
 
Mrgreen94gt said:
There's no real reason that excellent performance can't be had along with reasonably good fuel economy. I'm sure that there are plenty of really fast cars out there that get over 20mpg.

Didn't the new Z06 get like 30mpg on the highway on a bunch of long term tests? You talk about performance and gas mileage!