Hemi2Slo

I've got an 04 sierra with a 5.3 with 241 heads shaved .050. Right now I'm running a 224/224 cam but I want to change to give myself more towing power. Everybody has told me to get a 212/218 cam to tow. So I been reading and I decided to spec my own cam. I came up with 212XE/220XER, .558/.581, 112 LSA, 108 ICL. I went with the XER on the exhaust for the agressiveness because I only have shorty headers. My question is, do you guys think that the exhaust duration is too much? Should I stick with 218 or will I be good with 220? Thanks in advance.

chrs1313

iTrader: (24)

to be honest 2* isn't going to affect anything...you are probably talking 2-5hp/tq difference...

99Bluz28

iTrader: (35)

IMO, the 220* xer should be fine on the exhaust side, but a 210* xfi(.595") on the intake side would be a better choice than the 212 xe lobes.

Hemi2Slo

Thanks for the replies. I thought about the XFI lobe but unless I can get that lobe in less than .590 lift I really can't use it. My valve clearance will only clear .590, as far as I know.

Paul57

I have this "Torque Monster" (per article) cam available if you are interested...Crane 1449551. It has zero miles/time on it. (Cam is sold)
http://www.hotrod.com/techarticles/e...camshafts.html

Hemi2Slo

Well my friend and I are gonna try to go together and get a couple cams, maybe at a discount we hope. But, what would be the advantage to the XFI lobe? Would a 206* .585 XFI work, or would that be getting too small?

99Bluz28

iTrader: (35)

Imo, if you want prolong the life of the valve train, and have it quieter then you could get the 220* with the xe lobes also.

Yeah I looked at the xfi 206, but I think it's to small. You'll be better off with the 212*xe lobe.

Hemi2Slo

I see. Yeah my current cam has XER lobes both sides. Its quiet, but I also have LS7 lifters, so that may be helping the noise factor.

99Bluz28

iTrader: (35)

The 210* xfi will offer more duration at .200" lift than the 212* will, so you'd get a little more hp/tq with a slightly low powerband.

Hemi2Slo

Well that's what I'm lookin for but I'm worried about valve clearance. My heads are stock 241's shaved .050. I have dish pistons. Would .595 lift clear you think?

99Bluz28

iTrader: (35)

I would think you'd be perfectly fine with the .595" lift with running a lot less intake duration, but there's only one way to know for sure, that's to check.

chrs1313

iTrader: (24)

duration is much more of a factor than lift is for ptvc

Hemi2Slo

So then, what I need to calculate is at what point the intake would be at maximum lift. I know that if it isn't at greater than .590 I'm good

Xaviarrahl

iTrader: (3)

Anyone else running that 1449551 cam? Looks like a good option for those running stock lq4... Shorter duration should help maintain DCR with the relatively low SCR