likenew94stang

I AM rebuilding my motor. I have the money (several 1,000's) in hand and trying to figure out what the heck I should do.

I have a stock 302 in my 94 GT.

I want to either build a 347 or a 306.

I am going to use the complete Trick Flow Upper-kit which are matched TW heads, Intake, cam, timing chain, etc.

I know the 347's aren't as "reliable" as the 302. But Im not sure what exactly some people's definition of reliable is. I am wanting a daily driver car, that I can street race when, ya know...neccesary. It might see a track...maybe 2 times in it's life (just for true 1/4 times).

What kind of power difference is there between a 306 and a 347 if the only difference lies in the block (same upper, and assc's)?

Are there true RELIABILITY issues with the 347? I know the stroke is longer, and that creates more wear and friction, but seriously...can it be that much? I will be using pistons where the pin doesnt intersect, which doesnt use oil.

I am planning on Nitrous and Supercharger.

I know I just typed a lot, but fill me in on personal experiences, opinions, and things you've heard.

I need some help so I can get to building!!!

likenew94stang

alright guys, come on, little help.

1990mustanggt

I have also heard that the 347 is not very reliable. It will start using oil sooner then the 306. I do like the Trick Flow kit. I have it on my Stang. I ported the heads and the upper and lower intake. It makes good power over stock.

1990mustanggt

If you are going to drive it daily, I would say go with the 306. Summit tested the Trick Flow kit and made 350 HP with the 306.

likenew94stang

how much less hp/tq will the 306 get than a 347 with the same TF kit, injectors, MAF, TB, etc???

1990mustanggt

It mainly depends on the type pistons you use. Flat, dome, dish. I would think it couldn't be to much of a big difference. I'm not exactly sure though.

likenew94stang

does anyone know about the power situation comparing 306/331/347?

Tims 88GT

treet racing is a no no, it gets people killed, i had a friend that got kill not to long ago because some *** holes were racing. get a 351 and put in the car. you have the power of a 347 and the reliability of a 302

1990mustanggt

that's a good idea. You can supercharge it also.

fordguy17

what are your hp goals? stock block is good till about 450-500 at the wheels. a supercharged 347 will make that easily...