How much HP will a forged 347 handle? Looking to buy one from speed inc or Texas speed. Thinking of going with -8.5cc diamond pistons. Any input?

 

Depending on parts used, It will handle quite a bit. How much HP do you need it to handle?

 

well i know its broad but 650-1000rwph i would be happy with 800rwph.

 

i was making around 700rwhp (135mph) with my 347 last season with just je pistons, eagle rods, chromoly rings, mls gaskets and some springs, hope to push 145mph this year.

 

im going to run scat H beams with arp 2000 bolts, and -8.5 pistons said to handle 20psi.

 

93 octane?

 

I got my forged 347 from SDPC. They beat all the others pricing. Give Matt there a call, or shoot him a PM.

Mine just made 632 with my P1SC and I haven't installed the meth yet. I did a lot of research but I ended up going with compstar rods, mahle pistons, and they threw in ARP studs for less than what other shops were quoting me for stock bolts! I'm very happy with mine so far.

 

I have an 8:1 Speed Inc. 348ci with custom Diamond pistons, motor has seen 10-26 psi, and has made anywhere from 680 to 867rwhp. I have a stock crank, ARP main studs, A1 head studs, MLS head gaskets, stock ported oil pump, Rollmaster timing chain and some H beam rods.

 

Thanks for the great info guys. Yes i want to run on pump gas! This is going to be mostly a street car.

 

i mixed a little 105 with it so it was probably around 100 octane with 15psi

 

whats matts PM??

 

I made damn near 1000 rwhp...probably made more actual hp on the street but dyno wise, no cookie on my 346 with the diamond pistons and eagle rods. I just pulled it out and inspected it, everything is in awesome condition. I plan to put it for sale soon

 

How much do you want for it?

 

Sorry if I ask a stupid question posted before now :

What heads and intake are you running? Also you running a cam? I remember you're running T70's but that's it.

 

PM sent

 

AFR 225s and a victor jr intake. TR224/114 cam.

 

pm replyed

 

Matt @ SDPC

https://ls1tech.com/forums/member.php?userid=3451

 

Cool... Badass... Good to know we got someone representing some of us "smaller cubes" guys.

 

I emailed matt he said he could get me a motor using a stock LS6 crank, CompStar rods, Manley or Mahle forged pistons (with the dish needed to get your compression down there where you want it), and AckerlyChilds upgraded nitrous/boost rings, also ARP bolts throughout the bottom end of course. For $3500 do you think i should go with that or a speed inc or Texas speed motor?