ok so being that the 8.1l is the bastard son of gm and is no longer made i was wondering who has thought of making a 8.1l say 8.1:1 compression on 25-30psi of boost.... boost is addicting

 

Most 8.1s i see running boost are under 10psi. I say build it up lets see what it does!

 

lol tierod is running i belive 12psi..
i was thinking forged custom crank. forged custom rods. ARP studs. fully sleeved cylinders. 200lb injectors. e85 ethinol, and meth injection. dual walbro 255. custom cam. long tube exhaust manifolds. ported heads and intake.

what else?

 

Are there any intake options on those trucks

 

25-30? the parts probably are not made to handle that and it would be a waste, my 427 makes 1550 rear wheel hp on 25psi, so you could make more with the 8.1 but the heads would crack and lift and it wont work. i mean 30psi? not realistic, you could do a 540 big block for less and make more power and it will live,

also you need alot of car to handle that much power,

 

8.1:1 compression would be way too low. You would be miserable out of boost. Shoot for 9.5-10:1 and run less boost.

 

for 25-30psi i would run 8:1 compression, 30psi wont happend on pump gas either. going to need c16 or E85. make sure to figure 3500-4500 bucks for the fuel system

 

You'll need way more than dual 255's. Tierod at best was running 15lbs on the stock rotating assembly. Unfortunately that truck is long gone.

 

lol this is a what if situation.. out of the question to do no way.. expensive VERY.. i do have a buddy at a machine shop that can make me anything i want but i would love to do this as a toy..

 

I am already building a motor to do this, first off too much stroke. Motor I am building 4.5 bore and 4.250 stroke. head bolts too small, I will be using 1/2 bolts. base compression will be 9-1. Getting those raylar heads i got from tierod sent off to getter bigger exhaust valves and some more port work. And of course aftermarket block. My custom intake twin 85 mm's hope to have some results next year after i get my other projects running when i get back from deployment