speedtigger

iTrader: (16)

I though you fellow carb neanderthals would like the latest engine that Brenton @ THR just finished.

It is a 6 liter that he rebuilt with stock parts, stock LS3/L92 heads with one of his special valve jobs and milled to get 11.5:1 compression, Victor Junior single plane intake and a Quick Fuel 750 carb. The cam is a custom 227/239 on 112+4 with .650" lift and stock rockers. Brenton says he takes great care to get the rocker geometry just right to keep the rockers happy at that lift.







Notice how it holds peak power to 6800 RPM with such a small cam. The big head and short runners can do a lot with not a lot of intake duration and relatively early 42 degree intake valve close. It is just hard to convince a lot of guys that a camshaft this small will make peak power at 6800 RPM.

LQ4BU

Sweeet

ZONES89RS

iTrader: (25)

Guess he was scared the bottom end would not hold to over 7k like the rest of us? I would like to see how the power carried another 3-400 RPM. Not bad at all, but I know we have seen over 600 HP with the same heads and a little less compression.

HioSSilver

iTrader: (8)

Why would you be scared? I've turned my ls6 7k for years.....and i am about to turn it harder. A friend turns his ls3 7100. 62nlade has turned his l99 like 7400-7500

Doug G

I like it....what fuel with that comp ?

Liontech123

No I wasn't scared to rev it up more, just was a little surprised on how much it hung on! Lol

Liontech123

That was all on our crappy pump 98 unleaded gas!
Which I believe is the same octane as your 95

Doug G

Crappy 98 ? LOL

This is why I stayed at 10.5:1... easy to fine 91-93 anywhere (and cheap)...a few places do carry 100 at the pump, but not really all that close.

6D9

iTrader: (1)

Man... we get is 91 TOPS. Nice numbers and combo..great job!

Doug G

"special valve job"

explain ???

Liontech123

I have messed a fair bit on the flowbench and dyno to see what valve job the square port heads like. Widths of cuts and angles also.

Liontech123

yeah but down under we only have crappy 98! Lol

Liontech123

thanks!

Doug G

Down under....well, there went that idea on a valve job be a bit pricey.

Liontech123

Freight would be more than the job itself!! Lol

silent_assassin

awesome results

cbunn

Very nice,,,,I'm gathering parts for a similar build.SBE LQ4 with GM CNC'd LS3 heads Vic Jr intake and gonna spray it.I'm gonna have a little less compression but I hope mine will make close to that N/A.Again very nice,these little engines are impressive.

helicoil

iTrader: (104)

Nice results with parts chosen!

Petey-Pop-383

What is being done to the modify the rocker geometry?
shiming/cutting stands?

AFTER HOURS MOTORSP

iTrader: (6)

Nice set up