boundbyz

I have a stock rebuilt Lq4 short block cnc'd ls3 heads. (275cc intake and flow 240 cfm on a 600 lift) 250 shot direct port injection kit. Im prolly gonna have to shift at 7000rpm to really use the heads. Will be running 4L80e with probably a 3600 stall and 4:56 gears. I have been looking into going E85 with Holly hp e85 carb. Don't know what size to go with yet? Could use the help on that as well. I don't know if I should go with dual plane manifold with spacer or single? Not sure what brands would work better for my application? Appreciate any help. Thanks.

Prorac1

iTrader: (4)

What camshaft are you planning on running? What is the intended use of the vehicle? What does the vehicle weigh?

3pedals

iTrader: (3)

821 heads flow abput 320 cfm @ 28" h2o stock, so something is wrong

Doug G

Seen that too....Heads shaved ? stock comp will be approx. 9.5-6:1 using the LQ4 with 68cc heads (L92/LS3) Vs. the 9.4:1 with 70cc ( stock 317's)

Need more info

boundbyz

Car weighs about 2900 pounds.will mainly be use for strip but some street. Wanted to wait and see what intake and carb was running and have one custom ground to the flow graph of the head with other things took into accountability. Prolly will be somewhere around 612 lift or so. Heads are milled twenty thousands. If I go e85 I will prolly go with different pistons to put compression around 12:5.1. I'm still up in the air. First ls build and just learned of e85.

dogsballs

similar to my build, check out specs on that, but thats a pure strip car.
236/246, 613/613 110 lsa
vic jnr L92 with 2" spacer
custom 950 holley by eric at horsepower innovations - $760 deliv



if you can live without overdrive i'd go to a t350 to free up some hp

VLS1

Next to nothing to be gained running E85 with a low comp setup, it would be more trouble than it's worth.

boundbyz

Thanks for the help. If I use E85 what is a safe compression ratio to run with the 250 shot and stock rods with arp rod bolts?

70shortwide

iTrader: (6)

My buddys big block is 13.5:1 and he sprays 600 on e85 so your probably not gonna have to worry about going over limits of e85

boundbyz

Heads are milled twenty thousands.

boundbyz

Does he run a dedicated fuel system for nitrous or normal wet kit with e85?

70shortwide

iTrader: (6)

Its a fogger thats fueled from main tank

Prorac1

iTrader: (4)

We have run E85 on 13.5-1 builds and such, but I don't think it would be worth the extra time and money to use it below 10-1, IMHO. Eric L

boundbyz

Then I'm probably going to get some higher compression pistons then. I would like to run 13:5.1 compression if it's going to be safe. I heard the e85 fuel is highly corrosive and sometimes can corrode within two weeks or so. If so is there a way to stabilize it?

boundbyz

Then I'm probably going to get some higher compression pistons then. I would like to run 13:5.1 compression if it's going to be safe. I heard the e85 fuel is highly corrosive and sometimes can corrode within two weeks or so. If so is there a way to stabilize it?

70shortwide

iTrader: (6)

it wont corrode that fast. he has let his set 3-4 weeks between races and never had a problem.

boundbyz

thanks I appreciate the help.

Prorac1

iTrader: (4)

Yeah, it wont happen that fast. BUT, I wouldn't use rubber fuel hose. I switched all of my hoses to the PTFE braided from Aeroquip, and I run pump fuel. But with the amount of ethanol content in pump gas now days, it eats through the rubber line after a while. Now imagine E85. Eric L

boundbyz

Good advise. This set up is just to get me racing soon. In the winter will be going to fuel injection and twinned turbos. My block is an Lq4 and I know later in the years flex fuel engines came out. Is my block missing any kind of sensors that would prohibit me from running e85 if I wanted to run fuel injection later on?

Prorac1

iTrader: (4)

You have to make some changes to run E85 over pump gas or race gas. You need to set the carb up properly, ive seen a lot of guys running quick fuels E85 carbs on here.

You need a pump and regulator that will pump the BIG ammounts of fuel that is required with E85, and will hold up to the corrosiveness.

As previously stated you need lines that will hold up to the corrosiveness of E85

If you go fuel Injected, you need LARGE injectors to keep up with the demand.

If you want to go with twins next year, I think E85 is a great idea, but running high compression and a carb this year, and switching to injection and twins next year is just a waste of money. You need to pick one or the other IMHO. Hope this helps, Eric L