OK, I am officially a huge fan of L92 heads after seeing this combo. Customer has an immaculate six speed 98 Camaro that he road races. He wanted a motor combo that would make strong power under the curve, not just at peak. He sourced a low mileage 6.0L LS2 out of an 2005 Vette, then added some stock L92 heads and LS3 intake manifold w/90mm TB and stock MAF. The exhaust would be 1 7/8" American Racing headers with dual cats. He wanted a custom cam to match all this and emphasize power in the mid-range:



The cam is a 223/231 .610/.617 113LSA +4 advance using Comp LSL lobes and Patriot Extreme dual valve springs. As you can see, the combo worked amazingly well.

 

WOW that thing looks like it would pull forever. This is about the same combo I have been thinking about doing for my car.Patric...what do you think this combo would do with a victor JR with a carb? I know the LS3 intake is a restriction but Im just wondering how much.

 

You would want a different cam of course, but a single plane and carb should make even more power up high, but it would not make close to the power in the mid-range.

 

Very interesting looking combo. Very strong down low and still nice everywhere else too. Its good to see people stepping away from PEAK numbers and going for more AVG power. Nice Job PatG.

 

Nice job Pat. that's the kind of graphs we like to see. The L92 heads are deff. catching on, now if Comp will just release that intake.

 

Holy crap! Not unexpected, but still, holy crap! Nice work! How's it drive/idle? How will spring life be with that sturdy lift? It will be nice when the FAST LSXr comes out, add that and some ported heads, maybe true duals, and this one would be knockin' on 500...

 

Great power but whats up with the spikes in the AFR? What did the MAF scan look like when going WOT, kinda smooth or jagged stair step? What kind of dyno WB was used?

 

Very impressive Patrick. Big broad power from a relatively small duration cam. A great looking power curve for a 6.0l.
Congrats.

Richard

 

gosh, thats great! those heads are sick! great work on that cam too, power band looks incredible.

 

The reason the wideband was showing some small spikes is because the AFR scaling is exaggerated to allow for better tuning. Most dynos average and/or smooth the AFR readings, also the reading was taken from the tail pipe and not from a dedicated bung in the exhaust which is what I prefer to use.

 

People have been getting great #'s out of L92 heads for years. And maybe I missed it, but what in particular has now "officially" made you a fan of L92 heads?

 

results.......

 

???

I mean the results here are good (they are not great). I am just wondering what transpired with this build to make Patrick a fan of L92 heads now as opposed to people that have done the same thing in the past.

Or an even better question would be why was he a hater of them before this build.

 

i could'nt figure out what so great about the #'s either.

 

Nice numbers Pat. The car has to be a blast to drive. I thought you needed small intake runners to make good low/mid power.

I think it took you so long to come around on the L92/LS3 heads because we've seen so many done completely wrong.

 

what gasket? quench?
he actually lowered the ls2 scr by just bolting on the l92, any mods to heads?
by stock i assume no mill
very powerful indeed!

 

The car is mine, I'm very impressed and excited about the work that Patrick did; great cam specs for big numbers under the curve and still retains awesome driveability around town.

The heads are untouched, stock GM .054" MLS gaskets, and they're the solid valves; static comp is around 10.4:1. For an SLP lid, stock untouched MAF, and cats I thought the numbers were pretty damn good.


Big thanks again to Patrick and Kurt getting it running so well!

Here's a video: http://www.youtube.com/watch?v=09l-82k6cBI

 

if they were milled and ported with ported intake and 85m maf maybe 500?? for sure 500 when the LSXR comes out 102mm

 

So this was acheieved with stock L92's???? Looks like I'll stick these on my TBSS and put the old 243's on my Camaro...Hey Pat I am assuming that you would have to spec a more TBSS friendly cam to get that brick moving huh?? Great Job by the way

 

Simply because of their incredible performance for the money. Here we have a fairly low compression (10.36:1) 364 running unmilled, unmodified stock L92 heads, with a small 223 cam, dual cats, fairly restrictive GMMG catback, and stock MAF with the screen still in it. The L92 heads cost about $500 yet (when cammed correctly) deliver the performance of AFR 205 and TFS 215 heads.

You don't see too many cathedral port heads making these kind of numbers unless they are high dollar aftermarket castings, running much higher compression, coupled with a FAST 92 intake. I had not seen very many combos with good results with L92 heads in the past to become a fan, but this is mainly because people didn't nail the ideal valve events when selecting a cam. This is just a case of all the parts of the puzzle working together well. Kevin did his homework when selecting the parts for his combo. I'm glad to have been a part of his build.