AU N EGL

IIRC smaller intake runner size in heads, provide better low end torque. ie. smaller runner high velocity air flow into the cylinder.

If this is true, what would be a good seat of heads, with the smaller intake runner size?

I also under stand there are OTHER things involved too, Intake, TB, Cam selection, LTs and TUNE.

Second question a great cam ( does not need to be street friendly) for low end torque, ie out of corners in 2nd or 3rd gear. Road race not drag racing.
2500 to 6800 or 7000 redline

emissions are not an issue.

TIA
Tom

Deeavi

iTrader: (16)

These will work for you!

https://ls1tech.com/forums/lsx-parts-sale/829524-patriot-stage-3-lq9-heads-like-new.html

Deeavi

iTrader: (16)

Then again they may not work, because they require at least a 4" bore. Sorry!

AU N EGL

I have an LS6, with PP 243s on now. LS6 manafold and a TPIS TB

Dont quite want to build a new motor yet.

Thanks anyway

PREDATOR-Z

AFR 205 or bust. That is one of the best small runner head (205cc, hence the name)

Look for Patrick G's thread in his sticky, 500+rwhp achieved (in a F-Body)

AU N EGL

Thanks Yes that is a great thread

Tony Mamo @ AFR

iTrader: (13)

The AFR 205 was the original and arguably still one of the best examples of what your looking for. A small efficent head that flows big numbers thru the entire curve with a very modest cross section that yields big airspeed to enhance engine acceleration and low/midrange TQ.

Part throttle is especially enhanced and unfortunately that can never be quantified on the chassis dyno but experienced (and appreciated) every time you drive the vehicle.

You have been on this board a long time....I was surprised to even see this thread with you as the originator

Call me if I can be of some assistance or help you design a package around our product.

Tony
(661)257-8124 Ext. 109

vettenuts

iTrader: (4)

I ordered mine last night

AU N EGL

I read so much about BIG HP numbers, which is nice, but I want and need get out of a corner in 2nd or 3rd gear and UP to speed ASAP.

Read something a while ago about that smaller runners give better low end torque so I kind off though so, but want to ask to make sure.

Thanks Tony

93redBIRDman

iTrader: (9)

if you're road racing, wouldnt you always be above 4500 rpms?? Then you wouldnt need low end torque, only high end hp...

The Alchemist

iTrader: (19)

How low of an rpm are you talking about? I'm guessing that coming out of a slow corner, you'd be at 3000rpm or so, and that puts the AFR's in a pretty sweet spot torque wise.

AU N EGL

Yes 3000 to 67 - 7000 rpms. Staying about 4500 is just not practical. PPL that run lower gears but high RPMS are not really any faster, nor have better acceleration. They just break a lot of parts and have heat issues

So a great FLAT torque curve from 2800 to 4800, is far more beneficial then high hp above 6000 rpms. But if I can have the HP above 6000 too, I will take it.

Remember guys most road races are slow speed corners, high speed corners and short straight, not long straights. There are only a few tracks that have straights longer then 3000 feet.

Longest straight I run is VIRs back straight at 4000 feet with a + 100 foot elevation change at the 3000 foot mark. The fastest is Road Atlanta's back straight.

Plus there is always traffic, faster cars and slower cars that are being lapped.