GM for one uses it on there stock cams in all the LSX based engines
GM also use a 9 degree split with the HOT cam and the ASA Cam
GM also uses even more on the LS3 or LS7 headed engines

Why?
What is the advantage of a cam that is split like the hot cam?
218-229 525-525 112?

ASA
226-236 525-525 110?

What is this exacly designed to do and for what applications?

 

generally a cam from the factory is designed to meet emissions regulations, so they basically put the smallest cam in that will make power...obviously stock cylinder heads are weak on the exhaust side and flow pretty decent on the intake side, so the exhaust gets a bit more duration to compensate for the smaller valve/runner. Im no cam expert though obviously, you should try posting this over on hardcorels1. Most of those guys seem to know their stuff, and im sure ed curtis might have some input for ya

 

What he siad

 

I would think the stock LS1/LS6/LS2 intake hurts it too but u would also need headers and good exhaust to run this type of cam?

 

the stock intake manifold is not a restriction on a stock car by any means...when put a cam in like the one you posted (218-229 525-525) you'd need a set of headers and a catback to really take advantage of the extra exhaust flow. you probably wouldnt even notice a cam like that except for the 112 lsa would make it a bit more choppy. sure you might gain some top end by switching out the intake manifold but your probably giving up some low end tq because of the small intake duration and high flowing intake manifold.

 

Here is a quote from a guy that did the HOT cam in a LS1 with accomaning mods...."The HotCam and with the other complimentary mods in my sig together made an SAE corrected 393hp @ 6087 and 370ft lbs @ 4110"

This looks like a midrange little monster and I know GM put one of these in a LS3 and made 480FWHP and the L76 intake is better then a LS2 so I would think this HOT cam in a LS2 and a Wieand intake might be badass and u would only have to shift the car at 6000 to 6200 rpm..

 

i think the cam would work well with the weiand and maybe a set of 243s with a little port work (maybe just a valve job and a smaller gasket) and run a higher LS1 maybe somthing around 116 or 114 and you'd have a killer little sleeper car. Personally id have someone custom grind me a cam if i were gonna put an L92/l76 or ls3 (same thing basically) to take advantage of the better flow, otherwise you'll loose tq all over. i'd also mill the heads for added compression and run more lift on the cam id. Like i said im no cam expert so i dunno how running more lift would affect ramp in (im sure it forces a more aggresive more punishing to the valvetrain lift and drop off) but a solid spring should take care of that. Your idea of a biased exhaust (large split) would probably be more beneficial to the L92 heads. i think though if you went a little larger on the cam you could really make good power.

 

In the LS3 it looks like extra exhaust duration is needed.
In an LS1, you don't need that much of a split if you have headers. The extra exhaust can help it carry past peak if you spin the motor high, but for a given amount of overlap, I'd probably reduce the split and pick more on the intake.

I definitely like the idea of using bigger lobes as suggested by ExTurbo. A 218 XFI and a 228 Xer is one way to go. the 219 LSK and a 226 Xer would be great too and not change the overalp.

 

I'm going to run a cam designed by PatrickG for my GTO
(Cam only with Wieand and or Fast intake and all boltons)


I have the specs on 2 cams and havent decided on which one as I dont know how good the Weiand intake will be,I might go to the Fast and in that case right to Cam #2...

My Custom Cam specs:
Spec'd 1 are 218-224 111+0 Not telling which lobes so you'll need to guess lift
Spec'd 2 are 224-228 111+1 I will give u a hint here 60X/58X

Everyone thinks u need big cams,I think u dont

 

You dont need big cams to have a well rounded setup thats for sure, but i'll be willing to bet Tony will still have the edge at the track with the larger cam. Personally I'd go with the 224/228 cam to take advantage of the weiand/fast your planning on should help build tq in the mid range as well.

 

Dont believe the 218-224 he spec'd isnt a a bad little cam,its good to 6300RPM and will make KILLER TQ

Hint #2
This is the Dur. but spec'd on the lobes I have they both act bigger

 

The 218-224 111 cam will have a very crisp throttle response. For a daily driver, you'll be pleased.

 

My cam specs are in my sig and am interested in pulling this cam when the new Weiand/Starr arrives and swapping it for a cam with same duration but on 112 and with 60.x lift.

I think there is an xfi intake lobe with that lift .

Currently car just ran 12.4 @ 115.5 mph in bad air and track prep with lots of wheelspin @ 4000 lbs on street 20" rubber and stock stall. Shooting for a 12.00 with new rubber in a cpl weeks.

The cam is a tight fit with heads milled .030 with regards to PTV but would the 224 - 228 111 +1 be a tighter fit than the 224 -228 114 +2 ?

cheers

 

U are correct..

Its a XFI/XER spec'd cam and its 224-228 on a 111+1..(2nd Choice)
But I will only run this cam with the Fast intake

I will run the Wieand intake (1st choice) (IF IT WORKS AS THEY SAY) with this spec'd cam XFI/XFI 224-244 111+1.....



These cams were spec'd for a 6.0 GTO A4 w/stock 243 heads...

 

This is incorrect. Most cylinder heads, from the factory, are INTAKE limited. This includes LS1, LS2, LS6, LS7 & L92/LS3's.
You are correct in stating that the factory puts in only enough to make the required power.... the short intake/long exhaust cam helps with idle quality and emissions - the long exhaust creates low speed/throttle angle reversion which reduces NOx without having to add an EGR valve - all the while helping to extend powerband of the short intake lobe. It is NOT, however, designed to make the best VE/power curve.... that's what we do.

 

What are your porting results from the LS3 heads? I've heard there haven't been significant gains on the intake whereas the exhaust gains a lot. That suggests the LS3s are somewhat exhaust limited.