or u can buy my 4.8, its a proven lil engine. Or the 364 I have at the shop for boooost

 

my vote is 370 and upgrade that lil 76 to a 88 lol...

 

thats what im thinking but a friend told me that a 370 will make the same power with less boost than a 347 with more boost

 

are you basing engine size around a given form of FI? That's not the same question now is it?

 

370 ftw!!

 

lets say for examp the both motor have an 76mm with 15 psi which will have more power

 

The 370 of course, because you putting more air though it. 15psi of boost is only a measurement of restriction, not the amount of air being flowed by the motor. The point Stock48 was tying to make is to make the same power with a 347 as a 370, the turbo will have to make about 3 lbs or so MORE boost to make up the different in the amount of air the engine needs to consume to make X-power. In running the higher boost, say, 18psi on the 347 vs 15psi on a 370, may put the turbo in a better efficiency range then it is at 15 psi. Here is a general compressor map for a T76 to give you a better idea of what I'm talking about. See how as the pressure goes up, the turbo get more efficient for the amount of air its pumping?

 

370 it is then dam the poll is 1 sided lol

 

just build the 370 and run the hell out of that t76.. gives you room to grow...

 

What's the bore and stroke of a 347 out of curiosity?