A friend of mine is looking for a new cam. Here is the AIM session we had.

cobrakillingz28: durations are 231/231 with .595/.595 with a 112 lsa
cobrakillingz28: with lid/LT's, true duals, and 231/237 112 a guy got 403
cobrakillingz28: so would i wnt to do 231/237? since they're the same price
cobrakillingz28: TSP makes a 240/240 112
cobrakillingz28: or i could go 236/236 112
cobrakillingz28: the 236 is
cobrakillingz28: .585/.585 112
cobrakillingz28: wouldnt the 231/231 .595/.595 112 show the most
cobrakillingz28: larger lift is more power right
cobrakillingz28: either that
cobrakillingz28: or the 231/237
cobrakillingz28: which has
cobrakillingz28: .598/.595 112

This is a 2000 Z28 M6. Will be doing a kooks long tubes, true duals, and a 12 bolt first. He will also be doing some AFR 225 heads.


Cliff notes: 231/231 .595/.595 112 LSA vs. 231/237 .598/.595 112 LSA vs. 236/236 .585/.585 112 LSA/

 

this was on a 02 with minor ws6(ported TB too i guess), and i guess thats all the mods he had displayed...

 

TTT
Any opinions? Are these cams really big for LS1s? My cam has similar duration(little more on the exhaust) but that seems like a lot of lift. Is he going to run into a whole bunch of other issues if he runs any of those cams?

 

its alright nick, i found out a lot about em from ls1tech, they're about as big as you wanna go for street, the torquer is better than the 231/231, the 231/237 has a longer power band and has more torque initially and better top end but not by much more, the 231/237 sounds bigger at idle. thats what i have learned for the most part

 

those are fairly big cams. they are gonna be very lopey and have a very high-powerband.

if you like big there's always the new T-rex....the duration is 242/248 and i believe the lift is .612 or so. i personally don't recommend them, because i've heard some negative stuff, plus i had a friend who had a big debacle with one and fragged a motor, but you might wanna look into it.

 

the T-rex is a little too big for driving in normal conditions kinda....110 LSA and huge lift and durations, its power band is maximum at around 7k rpms...

 

Those cams would be considered really big a couple years ago, but nowadays people seem to run them all the time in daily drivers. Its all in the tune and whether or not you can live with a higher RPM powerband. If your friend is going with AFR 225s, then I would go with a huge cam as well to take full advantage of their capabilities. Whats the lift and LSA on the 240/240?

 

That is the same thing people said about the CC306 (which I have), but I really like it.
I am not really sure what it was, but I think it might be like .590/.590 or so with a 111 LSA.

 

whichever cam he chooses he'll need to fly cut the pistons...The stock Flat tops can't handle that much lift or it'll be too close for comfort IMO. If you've got the heads off, it's not much harder to drop the pistons out and have them done at a machine shop.

Chris

Or better yet buy some nice Diamond, or Lunati slugs.

 

Big duration and lift along with fast ramps will make for higher maintenance cycles. All of those cams will make good power, but you will need good tuning, springs, and watch those springs very carefully. I would recommend a lot of research before purchasing.

 

The 231/231 will have more mid-range than the 231/237, but not the peak power. If your friend is going to run the 231/237, I would recommend a 4000 stall converter or more gear if it's an M6. Both cams should be fine on the street as long as you get a good tune in the car. The cams should also be a little easier on springs as well. The ramp rates are not as agressive as the XE-R lobes that Comp has. I've seen customers run 918's on either cam, but most run dual springs. Both cams will have PLENTY of piston to valve clearance with stock heads(or aftermarket heads if there not milled too much). I'm running our MS3(237/242, .603/.609, 112LSA) with no P to V issues. The torquer cam is an excellent cam as well. There's just not as many out there, like the 231 and 231/237.

Brian

 

Flycutting is not necessary with either of those cams.

 

"your friend"=me, and the 240/240 112 i believe has .604/.604, i've thought of that too but I love nick's idle(screamnchickens), and i think the 6700 rpm power band is good, its between these 3 cams right now i guess for my main issues

A: 233/233 .589/.589 112 lsa(torquer)
B: 231/237 .598/.595 112 lsa
C: 240/240 .604/.604 112 lsa(i think), just afraid if this would be too big

i've been doing lots of research on ls1tech.com and found that people are gettin a lil over 400 on stock heads with the 231/237, i have seen many cars with these cam's, i guess i'll see what the numbers are for the torquer come spring/summer, i still have a ways to go, people also say with the 231/237 that 4.10 gears are almost required.

 

Flycutting may not be necessary with stock valves, but i would assume the AFRs have oversized valves in them do they not? I would make sure to check and double check the P/V clearence.

The T rex cams from what i have seen, are not able to be tuned in closed loop, so you are really looking at running an open loop tube = drag car.