[TJay74]

Originally Posted by KingLT1

OP engine has forged pistons.

You don't need meth for if you are willing to pony up for the fuel system parts. LT4 injectors and HPFP are good for 620whp give or take on E85. Jenetty documented this. If you use the LPE big bore then you can get up around 680whp on E85. ADM performance documented this with a 1le SS M6. This is with the stock cam...add a bigger fuel lobe cam like the OP has done and you can make 700+ with just the LT4 stuff on E85. LPE big bore is worth another 10% or 60whp of fuel headroom.

93 pump fuel hits a octane wall at 700whp, so 91 octane will be less. Stock fuel system is absolute max at 580whp give or take on pump fuel with FI. LT4 parts net another 80-100hp of fuel headroom. Again the issue you will run into with pump fuel is octane limitation and the high compression of the LT1. You will run into detonation issues...that is probably why your local shop said it needs meth.

I would buy the LT4 injectors + LPE big bore and run E85(e60 is really all you need if you want to mix it) or LT4 setup and a FI cam...keep the boost around 8-9psi... it should have plenty of fuel headroom and live a long life with correct tuning. Power should be in the 660whp range with the stock cam or 720 with FI cam. The cam setup would be pushing the limits of the stock pistons and precise tuning will be critical. E85 and high compression are a match made in heaven. Makes more power and consistent power with E85 on less boost then pump fuel. Take the same setup on 93 and switch it to E85, power will increase 60-70whp. It also has a much wider tuning window and more room for error. Notice most LT1's that have blown up are pushing stock fuel systems on 93. Food for thought.

I still run E85 in the car now, shops said up to E20 would be fine and still allow enough headroom. I accidently pushed it to E40 couple of weeks ago and the car still ran great.

I dont want anymore than 650rwhp range on the stock pistons, call me a sissy for not wanting to push it but I wanted a more conservative tune until the time comes at my decision to change the piston/rods out and the cam/AFM stuff.

So since I have a 1LE I already have the LT4 in-tank pump, so adding the LT4 HPFP and the injectors should be able to run on 91 alone of even up to 91 E60 and still produce the same power levels I have now without the need for the meth injection?

Lately I have honestly toyed with the idea of pulling the PC D1SC setup off of the car. Then put in forged pistons/rods, non-AFM cam with the delete kit and better springs, ported heads and shoot for 600rwhp N/A.

I like the PC setup, there are some quirks though that I dont like and that cant be fixed without spending another $1k to convert it over to the cog drive system.