I am looking for a little help on cam selection for a 370ci Iron block that is being built at the moment. Heads are TEA Stage 3 Judson 6l o-ringed flowing 331 intake 280 exhaust with 2.08" intake and 1.60" exhaust. The motor will be around 9.1:1 compression. Other parts are LSX 78mm intake with MTI Billet tb, Jesel SS series 1.75 rockers, meziere pump...

For the turbo, im looking to get a single PTK kit T88 maybe although that is up in the air as well. Suggestions?

Now, I wont have the turbo kit on for atleast 6 months and I want something streetable in the mean time. I was thinking around 234/228 with lift numbers in the .570 to .580. The heads have comp 978's so I cant go too extreme with the lift...

 

Im wondering this also as im going to ditch my current 230/236 cam and go with a more turbo friendly cam in my 370.... and my T-88.
Just FYI.. dont expect that 4l60e to last to long behind a 370 with a T-88.....
Kyle

 

I exspect my 4l60e to last be hind my 370 with at T76GTS. Hell it better. I would also like to know if i need to set up on a cam sence i stepped up on the motor. Or if i should go to LPE and get there blower cam.

 

Yeah I dont plan on having this a4 for long. I will be going with a built th400

 

No matter what it wont last................ someday you will face the music.......

 

Good choice..... i was going to go with a built 400 but decided id rather drive the car... me knowing no overdrive would really stop me from driving it....

 

i think having a turbo you would wanna favor the exhaust duration more, and have a tight lsa. thats just my opinion, i could be wrong.

 

usually a turbo cam has a smaller exhaust duration, or equal to the intake. that helps keep exhaust velocity up, so the turbo spools quick.

a blower cam needs a higher exhaust duration than intake.

 

hmm, i was told differntly. but then again, that was a advise for a turbo mustang..

 

I've had a few custom ground cammotion cams and they've all been wide LSA, with a split favoring the intake.

Something like a 240/232 .620/.620 114 LSA would work good. Might want to make the jump to a solid roller, that T88 needs a lot of steam to get going.

 

Thats actually something I was considering. The heads are at TEA right now getting checked out and I was going to have them clearance for the pushrods.


How often do solid rollers really need to have the rockers/preload checked?

 

It all depends on how much you drive it, and how hard you run it. In my old car I had a cam that was 242/233, .629/.617, 114 LSA, .017 hot lash, I was pretty religious about checking it, usually once a week, but I never had to adjust it for the entire summer (4 months). I was a bit fanatical doing it every week, but I don't think once every 2 or 3 weeks would hurt.

 

I personally would choose something in between your choice and eveiltwins recommendation. I've always been on the side that feels the smaller cams can get the job done in the LS1 turbo apps though. Then again, it depends on what the job is..

 

I am definately staying within the 23x duration range. All the turbo cams I have seen on here have been pretty small comparatively to the NA cams. Is that just a conservative choice on the owners behalf or is there some negative aspect of large duration that makes it bad for turbo apps? I think the largest turbo cam I have seen on here is MightyMouse's cam

 

THe small duration is largely a conservative thing. Your car will make more power with a 230+ duration cam, but it will also want to rev higher, which a lot of people want to avoid.

 

It should last a season of racing. If it does not i can have it warrentyed for FREE. Not a stock tranny eather. Fully built. Drum,clutches,billet pump, You name it i got it in my tranny.

 

So your saying what 10K miles...... thats not good enough for me..... my last built 4l60e lasted for 3K miles.... im glad u can have your rebuilt for free.... id be so pissed if i paid that much for a tranny and had to keep paying to rebuild it all the time...... thats why i got rid of mine........... to each his own...


On the cam side of this discussion........ I wonder if my 230/236 .598/.608 on a 114+4 is going to hurt me with my new turbo setup...... we are going to try it and if it does we will swap it out..... maybe go something like a 236/232 .580ish/.570ish on a 115LSA what do you guys think??
Kyle