blu00rdstr

I asked on Corvetteforum, thought I might ask here where there are plentiful cam gurus.

I'm planning on reusing my old cam, 224/227 .563/.569 114 LSA in a forged 366ci LS2 with stock LS3 heads.

Anyone have experience with a forged LS2 with LS3 heads? Is this too little lift?

Other specs

• LS2 -13cc Diamond forged custom pistons with a taller top ring down space, Eagle H-beam rods, and ARP head/main studs, stock 3.622" crank (366ci). Built and will be tuned by Robert @ Advanced Dyno in Suisun City, CA.
  
• LS3 heads have 2.16" intake, 1.60" exhaust, hollow valve stems, 70cc, and higher lift stock springs 'yellow springs' good to .580" lift, LS7 lifters.
  
• Fuel system has 75lb RC Engineering injectors, BAP, dual Walbro 255 pumps, regulator TBD.
  
• Blower is a D1SC with 3.2" reichard pulley, 8-rib setup, A&A v1.0 FMIC (full width) 2.5" outlet increased to 3" and mostly metal pipes, up to 17psi boost.
  
• Trans is FLP 4L65E stage 5, 1800 stall Vigilante converter.

This all may take 2 months to get done.

Frost

iTrader: (45)

No direct experience, but with an intake valve that big I'd verify PTV cleareance...

blu00rdstr

Thanks, once the heads arrive, I will ask Robert to check the pistons. They are custom Diamond forged pistons for an LS2, so it should be OK. Rick at Synergy and Robert at Advanced Dyno both said to at least use Comp 918 springs for an FI app.

verbs

Talk to Ed Curtis of FTI, a real cam expert.

Pro Stock John

iTrader: (34)

918's are not enough spring for that combo. 918's usually are not even enough spring for a lot of NA setups.

blu00rdstr

Really? Would AFR duals be the next choice?

I believe 918s are 110lbs/.580" lift, and AFR duals are 130lbs/.620" lift. The heads are using factory hollow stem valves, and I'll also use LS7 lifters. So there's a bit less momentum.

Pro Stock John

iTrader: (34)

I ran Crane 832's when I had a 230/236 cam, and currently run ET springs, not sure on the specs, but since Intmd8 pushed for them I assume they are like 450/180.

CHRISPY

Ditto on the springs, you need better springs running boost (boost acts against the spring)

blu00rdstr

I have a set of rebuilt A&A/WCR stage 2 ported LS1 heads for sale on corvetteforum. They have a dual spring (AFR?) setup. Maybe I should swap the yellow springs for the dual AFR springs, and drop the price on the A&A heads.

Mr.MartyStone

iTrader: (12)

#1 Get a real cam. Heed verbs' advice.

#2 Get a real set of springs. Not a sponsor special, call up a valvetrain expert and find something that will work for your application.

#3 Ditch the RC Engineering injectors. The motron 60# 'ers will be more than up to the task and the RC 75 lb'ers go static way before the motrons do. The motrons will support 900 rwhp in the right application.

Marty

vette#3

iTrader: (1)

i run patriot dual valve springs good up to 650 lift with no issues,cam specs : in the 230s duration on a 116 on a 610 on the exhaust lift i am running a 402 Ls2 with chris Ecs novi 2k

NA$TY-TA

iTrader: (21)

Im not a fan of Ed Curtis and his cam choices.... the cam you have will work fine.
I would do like others have said and check P to V clearence.
For valve springs the Patriot duals are fine and @ $260 for everything it cant be beat. and good for .650 lift.
Ive had them tested by to different shops that didnt know what springs they were testing vs Comp 921's and the Patriot springs came out on top in closed and open seat pressure.
Im not a fan of single valve springs for the sake if one breaks.... you dont have a back-up and most of the time its by by motor....

Other then that you should be fine....

Kyle

blu00rdstr

Thanks! Good advice on the springs and cam. Now that my memory kicks in, I do recall some high HP FI cars with stock '02 Z06 cams.

I was interested in behive springs because less pressure is required to reduce high rpm harmonics, but looks like the consensus is that higher spring pressure is needed.

So here's my next question: Anyone use dual springs with hollow stem valves?

CHRISPY

I agree with everything you've posted great info...

Rick@Synergy

iTrader: (5)

No, I was saying I hope you were using more than 918's for your app. I would never use a 918 for what you are doing. Just to clear it up.

Rick

blu00rdstr

OK, I stand corrected.

The geist of the comments are that boost will overcome some spring pressure.

verbs

You're the first person I heard say that, well about his cam choices that is. His cam (same size as a G5X3) made 492rwhp/423rwtq in my old setup with LS6 heads on my LS1 motor. That was enough for me.

ls1290

iTrader: (20)

For the size converter you have, I would not go any bigger on the cam. Have you thought about upgrading the converter? I think a 2400 would go nicely with the cam you currently have. If you go bigger on the cam, upgrade the converter.

Keith

L7I7O7N

Hey look up ecs blower cam. I purchased a mild cam, and i have a c6 a4. I also have l92 heads, l76 intake, kooks lt, corsa sport exhaust, with a p1sc-1 procharger running only 7lbs of boost. Yes the 918 springs do hold there own. I haven't had any problems. I can run up to to if i change out the pistons and the rods, but who needs that when you have over 600rwhp on an automatic street car thats a daily driver. I got one pass at the track before they threw me off so you so the math. Thats with street tires and i still get 29 miler to the gallon.

venom ws7

iTrader: (13)

WTF
Really man!!! do you think he' still didnt pick a cam after 4 years??