Ok, so i picked up a 355 that had a fairly big cam in it I was told. Its got sportsman II heads on it. Right now the tpi is still on it, but I have a HSR to go on sometime in the future. I have to keep my foot on the gas to keep the car from stalling. I dont have the card but im 99% these are the numbers, they might be off one or two digits but thats all.

Cam specs:

Advertised duration 290 degress..duration at .050 260 degrees
Intake lift .555 exhaust .535
LSA 106

So with those specs, what do you guys think? The guy I bought it from said not to even attempt to run FI with this cam.

 

sounds likes that cams power band is way up their in the 4-7k range. Way wrong for a tpi setup, you need that HSR right away if you want that high rpm band. And your mileage will be horrible.

 

i understand mileage will be horrible. This isnt my daily so its not a big deal. But wow I didnt know this cams powerband would be that high. I got a rear with 3.73 that im gonna be putting in also, along with those it seems like ill need a pretty high stall converter. Looks like this isnt much of a street friendly car anymore..lol

 

Even a cam with 230 deg@.050 is on the edge for a streetable cam. Might consider a less aggressive profile. Even with the HSR its a big cam IMHO.

 

That is probably the most horrible cam you could run with a TPI, ever. Yikes!! All of your HP is past where the intake works. You need a better induction system! Even with a Stealth Ram, that cam is way too big for street use. 260 @ 0.05 is HUGE and like guys said, that is a 7k type revving cam. I would recam that thing based on whatever new induction system you choose.

I have a 327 with Sportsman II heads on it, and a Stealth Ram, and I burn chips for it. I just installed a Comp Cams retrofit roller that is 224/230 @0.05, 274/282 adv duration, and 0.503"/0.510" lift w/ stock rocker ratio. Something like this would be much more appropriate for a street small block.

 

idk, i've seen cams in the 240-246 duration run on 406 inch small blocks and that was abit of a deal to tune. i dont wanna know how it would be with that cam in the 260 range and that LSA. probly sooo much overlap you'll never get the idle right, except if you let it idle at like 1200-1500 rpms

 

I dont have much experience with cams, but i thought this cam would be more rough then it is. I mean, I can hold the idle at 700-800 with my foot on the gas and it doesnt sound bad at all, has a nice lope, but once i let off it will stall in 1-2 seconds. I was under the impression that a huge cam wouldent even want to be at 700-800 rpms, it would want to be at a higher rpm. Am I wrong there?

 

You may want to double check the cam specs. Anything with an advertised of 290 deg is not going to be 260 @ 050.

I'd suggest finding out exactly what cam is in the motor. Can use a dial indicator and degree wheel, or pull it out and get the numbers off of it.

RBob.

 

good point, i didnt read teh advertised duration at 290.... that would generally mean a cam in the 230 degree at .050" range. thast pretty tuneable

 

Well thats good news. I dont have the cam card, im just going off word of mouth. At first I didnt care cause i was just gonna sell it or something, but now since its running, i just cant make myself do that. It seems this car may be more streetable then I first imagined, thanks guys

 

I didn't look but I'm thinking since my 224/230 comes out as 276/281 that that cam would be around 236 @ 050 which may prove to be a challenge.
If compression is not higher than 9.5 it could end up with a real low dynamic comp ratio.
My cam idles at 800 nice but sits at 55 Kpa installed at 104 (instead of 108 ICL). The brakes get a bit soft if I decell to quick after tromping on it. Possibly a vacuum can will be in order if you have power brakes.
Open up the idle screw and reset the TPS and IAC to get it to idle.

 

is that the comp 503 grind? if so thats the same setup i want to run. I wanted to install it on 104 icl as well! I calculated a .2 gain in dynamic compression with that advance so i figured it would help alot. 236 cam will be hard to tune but definately doable compared to something else

 

The shortblock had flat top pistons in it. The guy I bought it from said the comp ratio should be like 10.1 with 64cc heads. My heads are 64cc. After I get my headers on Im gonna adjust the throttle screw a little and reset the tps

 

the more duration you have, the more compression you will need..

i'm running a comp cams 306S, but i'm carb'd.. 306/306 adv duration, 260/260 @ .050".. .592/.555 lift with 1.6/1.5 rockers.. and only 110 LSA.. its alot of cam for my 385 and i have 10.65:1 compression.. if you put that in a 355, with less compression and a tighter LSA, you will be getting into the realm of the hondas with no power down low and just a screamer (exaggerating)..

i would suggest a different cam.. what is the grind number for that cam you want?