EVILLS2

Hello everyone. I'm starting a new project this winter. Car needed some tlc and I want to get a jump start on it. I don't usually post threads, instead I just research and usually find answers to my questions on here. But cn't seem to find any for this one. I will describe my setup first.....

05 c6 m6 stock block MP 112 magnavolt with 3.0 pulley, Kooks headers, catless X-pipe, B&B Bullets, ported 90mm throttle body. 60,000miles on car

The car came from California and I recently discovered it was owned by another forum member. I bought It on ebay around 2 years ago from a lein company because it was a repo. Very mistreated car. no coolant in the maggie reservoir engine oil as black as my paint etc. etc. As of now I have the top end tore down and the cylinder walls look really good.

I want to upgrade the mp112 maggie to a tvs (not sure if I want a 1900 or 2300 yet) and put a decent cam with a good lope and some good flowing heads on it. The motor is still in the car for now so but is so covered in oil it looks like it has 150,000 miles on it, so I will most likely pull it for the cam install and give it a good cleaning. I would like to reach the 600 to 700 rwhp mark with a head and cam package to even out the powerband of the torque from the blower. Basically a durable platform and good street drivability. I live near St. Louis and Gateway has a new owner and is going to open back up next year so I am planning on taking it to the strip now and then. Any suggestions on what heads and cam, and which maggie to go with would be greatly appreciated. Open for suggestions!!!

old motorhead

A set of stock LS3 heads or ported 243's will work well. Won't break the bank either. You will have to match the blower to the heads though. The blower manifold base is different for the square port vs catty port heads. I wouldn't fool with the 1900 if you're looking for 600+ rwhp. A big cam will make little if any more power than a milder one. I'd stick to low 220's on the intake with about 10 to 12 more on the exhaust. A cam like that with a 114 lsa will give you a little lope as long as the idle speed is set low.

383

Do the 2300's typically need to be matched to the heads(243's) when they are ported? Katech uses this cam in their stage3 ZR1
http://www.lingenfelter.com/mm5/merc...w=&range_high=
Anyone else get to 600whp with this cam and ported 243's? I think its possible given the NA power guys are getting by porting stock heads.

old motorhead

Probably more gains to be had port matching to LS3 heads. The manifold ports on the catty port units look closer to the actual intake port on the head. At least they do to me. At mid 600's to the wheel, it's probably not necessary anyway.

I'd get a custom spec cam instead of that one. Unless you have a seriously crappy exhaust, you don't need 247 degrees of exhaust duration with .656 lift on a mild blower cam. I'm sure that cam along with a little boost can help get to 600. I've seen it on combos well above that. I've also seen combos with much milder cam profiles make similar numbers. There are better lobes out there now than the Comp Cams LSK lobes that are used on that cam. Do some research on cams using EPS lobes. Good power and easy on the valve train.

EVILLS2

Would a comp cams LS/R 227/243.617/.624 114 lsa cam and ported ls3 heads with a tvs 2300 be a good combo? I am clueless on cam/head combo's for FI motors.... Trying to educate myself

old motorhead

I wouldn't fool with a cam that big. Using a TVS2300, it will make you little if any more power vs a milder cam. A stock Maggied LS3 will do 625-650 wheel with the 219/231 .607/.617 115lsa that I'm using before you have to worry about belt slip. A bigger cam might lower the boost a little and allow a little more power, but I'd bet it would be negligible. To me, it's not worth having to deal with a bigger cam to get just a little more performance. The 227/243 114 cam has 7 degrees of overlap. Mine has 5 degrees negative overlap. Big difference in manners between the two.

EVILLS2

Are you running stock heads? would 243's be better than ls3 heads if I was to go with the same duration cam as you mentioned for my ls2?

old motorhead

I have stock LS3 heads on my vette. I have Livernois stage II ported 243's on my truck. Both with TVS2300's. I think the flow rates of the two sets of heads are very similar. There is a pretty big difference between stock LS3 heads and stock 243's though. Stock LS3 heads play real nice with boost. You can make similar power with stock 243's.....just takes more boost to do it.

383

Do you think the 7* overlap helps the blower "scavenge"(right term?) some exhaust helping the overall performance?

old motorhead

Overlap would probably help if you had plenty of blower. If you're near the capacity of the blower, I believe a cam with more overlap will just help make more noise and give drivability issues. Not sure about the TVS, but I know the earlier Maggie rotors would "knock" with a rough idle cam. I had a higher overlap cam for just a short while on one of the earlier Maggies. I didn't leave it in there very long.