Jenson

iTrader: (32)

Anyone running these yet? Ive been drooling over them for a couple weeks now

http://www.racingheadservice.com/rhs...r-ls1-ls2html/

JakeFusion

iTrader: (7)

Those valves are enormous for 3.9" bore. While I love LS7 heads, they give up midrange vs cathedral port on 427 combos (but make a lot more HP). On a 346 or 383 it'd be interesting to see...

fubar569

iTrader: (9)

This.

Jenson

iTrader: (32)

I was thinking more for a turbo setup for myself. For an all out 346 drag setup though...TSP should get a set and see if "the 346 record holder" will go faster.

dr_whigham

iTrader: (49)

I wonder if you couldn't redo the valves and seats for a 2.04 / 1.6 valves? Just an idea.

A.R. Shale Targa

iTrader: (2)

TSP would just design an LS7 runner PRC head......as Jake stated though the
intake valves would need to be a tad smaller in order to not be shrouded in
a 3.9 bore. Just adding those diameters now is 3.865"...leaving only .033"
stock bore or at most .040" with a 3.905". Figuring .015-.020 between the
valves leaves very little room on the chamber sides. For a forced induction
application though they would be pretty insane.

JakeFusion

iTrader: (7)

266cc intake ports on a 347 would also be very large.

A.R. Shale Targa

iTrader: (2)

I thought recently that someone posted a link to a company putting 2.08 IN
valves in GM LS3 castings to make them small bore compatible. In that case
you already have a large volume runner and a bowl originally designed for
the 2.165" sized valve. Not exactly ideal.
What would be really cool with these RHS heads is if they took the P-port version and kept it as small as possible (cross sectional area) and perhaps a
volume of 240-250 cc range. Even 2.055/1.6 or 2.08/1.57 combo of valves
when combined with that LS7 runner shape would definitely move some air.
Still got that stroker combo on your mind DR ???

dr_whigham

iTrader: (49)

Lol. That was me.

I sold that crank when I picked up the Vette. The Mast small bore LS3's have the 2.08/1.57 combo. I believe it's a 240cc intake runner.

I've always thought about what if someone bought the ballistic speed ls3's and welded the runner up some, making it smaller for a bit more velocity, and using a 2.04/1.6 valve combo.

At that point they'd be the same price as Mast's, but with a hopeful more bit of velocity. I believe someone has welded on the ballistic speeds here lately...

JakeFusion

iTrader: (7)

I don't know why AI doesn't offer a ported LS3 based on their highly successful port program. They could just weld up the LS3 chamber and run a much smaller valve 2.055/1.57 combo with the LS3 port work they do and have a beast head for the smaller bores. 62cc LS3 head with much better PtV clearance...

Jenson

iTrader: (32)

Yes but the LS7 intake kills the LS3, and are usually cheaper. I hadnt done the math yet, thanks A.R., that is really shrouded.

KCS

iTrader: (20)

That has to be a typo on the valve size. Those valve sizes together are almost the size of a stock LS1 bore.

badassracing

iTrader: (13)

According to the 2014 new products brochure they have 2.10 intake valves and are also available in a P-port version.

http://www.mediafire.com/view/qr98u8.../CPG5-2014.pdf

Jenson

iTrader: (32)

Mmmmm, ^that looks a little better. I had asked my contact at comp about them last week but he hadnt even heard anything on them yet.

Rise of the Phoenix

iTrader: (27)

Very interesting. The plot thickens.

JakeFusion

iTrader: (7)

The 2.10" valve would work well for a 4" bore... not sure on the 3.9. But a 402/408 with these would make some power.

Rise of the Phoenix

iTrader: (27)

Not so well on a stock LS2?