I get nice power with the 376 with the torquer 7 220/248 615/648 with a 1.8 RAR. and a 1.7/8 hdr. The heads are cnc'd with a lil more attention to the exh ports. What really helps to wake it up is keeping the valvetrain light.

 

I could stand to lose a couple of pounds

He does have some good points and information but there is always more than one way to build something and other points of view that people should look into as well.

 

 

Couldn't agree more!

 

Just my opinion but the GT11 Lingenfelter cam at 215/231 -118 LSA is almost the same as a OEM LS7 cam 211/230 - 121 LSA. As these can be bought cheap (I paid $50 for my LS7 Cam on ebay) why not go that route for an econo build?.

Some will say the LS7 cam has slightly lower lift .558 vs .600+ for the Lingenfelter but for long term durability lifts of .550 or less are easier on the stock rockers and valve guides according to Page 73 of the new Motorbooks "How to Build and Modify GM LS Engines". http://cgi.ebay.com/ebaymotors/How-t...item27ac147c3d

 

I think Brets cams are good, Kevin uses one, he uses high lift short duration fast lobe-600 plus lift, and generous ex duration, ,

His reasoning is obvious fast cyl filling, you can still use plenty of overlap like this with a tight lsa as with short intake duration you minimise reversion and the intake moves a LOT of air thru a short duration intake. Eg 224 intake with 650ish lift or late 220s for a stroker with generous ex lift prostock style, try this with a 240s intake lobe and u lose low end for a minimal top end gain. The cam has have lobes in this scenario to work.


Eg 230s 250s cam huge splits on 114 LSA u get much more overlap and potential to lose power from increased reversion. With a smaller intake u can get away with it more and actually benefit if the events are right.

To go 230s why are people always speccing 230-248 when a 230-234 will make the same power. I think a 230s ex is well capable of moving 600hp of air. Intake reversion is a killer for torque and if the same power results can be obtained from a small split as big split with much less overlap why are ppl still doing it?

If I had a stroker I would look at less intake duration and more lift. And still dont go crazy with ex duration.

I have a cheater cam I used with my blown setup and made 30hp more at the wheels with 1 psi more boost. It drove very well had a lot of torque and revved pretty hard. They do work good They dont really need a lot of overlap the intake doesnt open to like 10 deg ATDC@ 50thou lift so it pulls a vacuum thru the intake from late ICL and then have massive lift and short acting duration and a 230 ex valve they are proven to work IMO the best street cam for these heads for smooth power.

For more top end hp good cam(if ur not worried about lift) is the 224xfi 230xer ex paul used the 224-228 xer to get the record in his G8

For excellent topend spins 230xfi234xer on 114.

For ex bottom end in a 6L-6.2 I like the 218-224-112xfi cam+0 it holds on and feels very abrupt any cathedral head car ive driven doesnt come close to the aggro power delivery of this cam and heads it may hold on better with a 228 xer zorst. The whole big port lazy down low isnt true they just need a shorter duartion intake then norm.

I guess for a stroker u could go crazier and use a 228 on 650 lift and 230s ex on 112 for the same effect.

Spin proved that small splits work with LS3s making over 500. And I see it here all the time.

 

My buddy is building a 408 with L92 heads. He has a Trex cam (244-250) 110LSA cam from his LS1. He wants to do a victor jr intake and his goal is 500 rwhp. I know he wants to reuse his cam but I've been trying to convince him a small cam would work great. Will the trex and victor jr combo work well?

 

thats pretty crazy bischcoff runs a 248/252 so why not try it?

 

Here is some food for thought.

We are posing over the LS3 cam testing and seeing 550hp. Livernois did a L92 swap on LS2 and it made 546hp with L76 intake and 494ftlb with a 232 236 112 cam at 3000rpm it makes 406 tq. This is comparable to the LS3s but with tighter split and lsa. With the GMPP it made 454 tq and peaked the sam hp much later, it really needs a tighter lsa like 108 to get it back.

Carcraft then did a LQ4- L92 head swap with a old comp off the shelf cam the classic 228-230-112 .571 lift on xe lobes.

With the GMPP intake it makes 551rwhp and 464 tq at the same rpms as the previous test engine with gmpp. This cam makes more power by 5hp and 10 foot pound more torque with less cam. Add 40 odd tq for the loss of the single plain and again we see a 550/500 6L with stock heads and intake with a traditional cam with lift that is comparable to the cams that did well in the LS3.

http://www.carcraft.com/techarticles...comp_cams.html

http://www.gmhightechperformance.com...ads/specs.html

So unless u are trying to win engine masters challenge with topshelf manifolds and heads and tight lsa roller cams maybe a 230 traditional cam is fine.

 

Here is a good example of what GM uses. The keep the lift low so they can use production springs.

GMPP Cams

 

the 236/246/110 went in warren johnsons lsx made 640 hp thru a GMPP.

 

That is the GMPP LSX454 cam.

 

The GMPP manifold changes all of the rules.

 

What about a victor jr 4150 setup. Getting my 418 l92 together and can't decide about cam. Never specd a l92 cam.

 

Thanks for the info. I believe these are flywheel numbers and not rwhp numbers though. 550fwhp might be 450-480 at the rear tires.

 

put me on the list of having the spinmonster 230xfi 234xer 114+2 cam. I'll let ya know how it works out with my l92 heads in the spring.

 

hello there im from AUS, im getting a 427 ls3 built buy a shop that sponsors this forum, with l92 heads, the motor has the fast 102 w/tb, the car is 4400lbs in weight with a 4l65e with a 4200rpm stall, the cam he told me to go is a 248/260 114lsa do u guys think it will work??
Thanks

 

Simple answer is probably not - but let us know. That's more intake duration than I've ever seen work well.

 

The GT 11 cam makes all it's power with lift, .630 & .640. Thats why it performs so well down low. The LS7 cam even with 1.8 rockers doesn't compare.

 

I agree with WKMCD, especially with a car that heavy..But, we are surprised everyday.