i have decided to go against the 10* spilt for now. been thinking lately that the test in the GMHTP mag used a typical ls1 cam on a ls2 and gained 45hp with the heads and intake. so for my combo ill be using my 244/248 612/615 112+2 with stock valves heads milled .030 and a .040 gasket. my pistons are -13cc and im a iron block 408. im using 90mm NW with a L76 intake and 42#svo injectors, which should put me around 11.5CR,it will be going thru a T56, and breathe thru 1 7/8 stepped to 2" kooks headers flowing thru true dual 3" into X pipe exhaust and out the both sides.

ill check PTV once i get the gaskets and as for numbers once i get it together ill make sure to run it on dyno. i can be happy with 500/500 rwhp NA

 

I like that cam.... sounds like a norm. 408 cam to me... but for some reason the extra exhaust duration with a wide split sounds good. I have seen many LS1's etc with a large exhaust running NA and they seem to put down nice numbers.

If I where doing your cam, I woulda looked at a 244/252 612/615 on soft lobes. 112+2 sounds good to me.

 

yea i know about the cam, see i want this done soon and ill worry about more numbers later. need to get it back on road and start gathering funding for a house. but i already had the cam when i was only going to go with your typical worked over ls6 heads. then the l92s came out and theres no proven results yet. i was going ot go custom but only car we know of with a custom cam hasnt put numbers down. the one setup put 500/500 down with a stockish cam. and the mag made those numbers with a LS1 style cam. so for now ill run what i got.

 

Quik, Just alittle info if you want it. My 427 with L92 and custom intake is on the engine dyno as we speak. All I can say right now is that with the cam from my ls1 setup what is close to the one you are running made less hp and tq. Trying different cams this week.

 

yea post up, and what was the specs of your cam

 

Quik, the twin pattern cam you have will be alittle better then the single pattern I tried. The L92 heads have a intake that flows so well compare to the exhaust that you are going to have run more exhaust duration with these intake to exhaust % numbers. We are looking at these heads like a chev big block heads for cam ideas. Mine ended being 251-251 630-630 112 that was after trying 3 cams and .5 compression on the dyno. 647hp 610tq. with 98 241 heads that only flowed 306.8 cfms. People with to take in account veloctiy of these heads compare the LS base heads. We are trying new cams this week.

 

I just wanted to add that with the L92 heads on the dyno the engine pulled more cfms but made less power. It looks like the L92 heads are going to need the "5" engine cycle. I have read about wider LSA and less duration with better flowing heads "less overlap" I have done 2 cars in the last year for people with very little overlap and both made LESS power then cars I have done with more overlap. I had a vehicle with the same everything minus cams. The car made 24 less rwhp on the same dyno with the same tuning. Hope this helps.

 

do you know what the intake to exhaust percentage on a ls1 is??? I bet around 62% or so right?

and what are the numbers on the L92's stock as far as percentages?? i assume 70% intake to exhaust right?

I bet with a little exhaust valve and port work you can get em to more like 65+%????

yes.... these are fictitious numbers..... if someone who knows doesnt mind clarifying that would be nice.

 

I'm putting a custom grind Comp Cams 236/248 Duration, .580"/.599" Lift with a 113 LSA, in a L92 416 CID block with static compression of 11.05:1 and 40LB injectors. I'm running stock L92 heads & L76 intake. This is a daily driver that will see limited time at the track using "summer only" tires. The motor should ship from SDPC2000.com on Wednesday, Jan 17th. I just have to endure the "responsible break-in period" and then I'll post the dyno reselts.

 

I assume for the GTO? what happened to the original engine? Keep us posted. thanks.

 

I only had 9,800 miles on my LS2 (2005 GTO). I was running a Comp Cams XR275HR camshaft that only had .566”/.568” lift. When one of the Comp Cams 918 valve springs, recommended by comp cams specifically for that camshaft broke, allowing my valve to drop into the cylinder while the engine was running. This caused 1/2" deep gouges in the head and #3 piston. The cylinder wall has a 1/8" deep scratch in it too. I'm really old school Pontiac, so I was thinking, no problem, I'll just bore it 30 over & get new pistons, rings, bearings & gasket kit. But nooooo, we use piston sleeves nowadays that can't be bored that far out. The whole LS2 longblock is gone as there isn't anyone in this state that can re-sleeve the block. So now I’m waiting for my new 416 L92 longblock to ship this week.

 

Thats a nice story. Every cloud has a silver lining

 

Sounds like a good cam and a good street setup, a lot of people want to see those kinds of results.

 

Kinda interesting watching people vote on cam specs I put zero thought into.

I was really wanting to find out what was on peoples minds. Shoulda not put that none of the above option in the poll.

 

I hope some of this was under warranty? I woulda pulled the head and cam out, then taken it back to the dealer and said a stock valve fell!

 

No Pontiac would not honor the warranty because the engine had non GM parts. I.e. Camshaft.

However I had also purchased insurance from an outside source, that covered the Pontiac dealer's estamate of $11,000 to install a new LS2 longblock.

God works in mystical ways.

 

I seriously doubt god gives a rats tail about your GTO..... but hey, If he is a gearhead like me....... maybe he does???

 

God doesn't care about cars. They don't have the free will to love him back.

 

Whats god?

 

I just saw this....... thats real close to my new cam (you have 2 extra degrees on the exhaust) is your GTO a manual or auto? keep us updated please.... i'd like to see your results are. (mine is being installed as we speak)

Good luck with your new setup bro