95_5.4_gt

hello some of you know i have a bored our 5.0 its now a 5.4 the previouse owner did it when he rebuilt the engine and tranny. i was wondering what problems i might have or if i need to look out for anything. what gas millage ill be gettin. and what performance i got out of it. the rest of the car is stock.

vfast

and how do you know it's a 5.4
I think you got some bad info

jeep45238

The walls could be very thin now (was it bored .040 over, .030 over....bla bla bla....).

You're going to get s**tty gas milage. Why is it that people buy RWD V8's then ask about gas milage? If that's a concern of yours, you SHOULD NOT have bought the car.

Take it to the track and find out.

95_5.4_gt

na i dont care about gas millage really just wonderin. i think the guy said it was .4 over but maybe he ment .04 over. so i put 2 and 2 together and figured that would make it a 5.4L. correct me if im wrong im totaly new to this stuff. thanks

horatio102

302 bored .030 over is a 306. 4 cid. Perhaps that's what he meant?

It might be time to pick a new screen name. <img border="0" src=smileys/smiley1.gif border="0">

Even .040 over isn't too much.

Some RWD sports cars get good mileage. Ido believe my buddy used to get near 30mpg cruising on the freeway in his C5 (at the speed limit anyway)

Buzzstang

DID YOU GET RECIETS ON WHERE THIS GUY HAD THE WORK DONE? IF SO THEN THE BUILDER COULD THELL YOU FOR SURE.

Tangerine GT

0.40 over isn't going to get you up to 5.4. I think a 5.4 is a 331 stroke... In which case your block would be bored AND stroked. I'm not sure if its possible to bore a 5.0 to a 5.4 without touching the crank. You should talk to the guy who sold you the car. Right now I run a 347 which is close to a 5.7 and I get about 18-20mpg high way which I find to be very close to my liking for all the work I've done. As far as problems, You might want to do some fueling system upgrades, and a radiator. Fluidine makes a very good dual 1" core one. and for fueling, I think a new pump, some injectors, rails, throttle body, and mass air flow should do it. I'm not sure if you're big on spending but I've changed just about everything and tuned it to a perfect 14.7:1 air:fuel and thats how I'm making this milage. Also changing those parts will free up some horsepower you might very well be choking off if the guy has stock fueling parts on the motor. Wow I forgot to ask, is it still fuel injected? Heh

vfast

it's a 306-07 you get maybe 10 hp out of the boring..gas milage won't change but the fuel being burned may be better over the surface of the piston now being a larger area and being new pistons