Ok guys im going to get a new cam in the GTA as of right now I have the summit Tpi flat tappet cam and with a couple of chip burns it just idles way too nice. What cam do you guys think i should go with? I want this car to be pretty driveable as a daily driver even though it probobly never will be. See sig for specks

 

Here is the specs on the Summit cam
Advertised duration: 268 intake/278 exhaust
Duration at .050 in. cam lift: 204 intake/214 exhaust
Gross valve lift: .420 in. intake/.442 exhaust
Lobe separation: 112 degrees

Also I am in the process of doing madmax's grinding up the intake manifod technique. anybody know how this affects the idle?

 

Wow, that cam is way to small for a 383

Even as a daily driver

I'd go about 220ish for duration @ .050 and as much lift as your springs can take, keep the 112 lsa

 

Hmm how not really sure how much lift i can go up to with my 1.6 rockers Dont want to start hitting the valves or anything replacing the springs is no big deal. How much of a gain is there to be made with this do you think? If not that much then I will probobly just wait untill winter. Its just been too nice around here.

 

a cam is probably the cheapest horse power, I changed just a few degrees and deffinatly made power gains

you wont hit the pistons untill you've broken over .600 lift, and you wont do that with a flat tappet

Just get around .500 if you can, even with the 1.6's you're deffinatly safe

 

Is this good or do you think i should still look for a little bigger.

* Advertised duration: 272 intake/284 exhaust
* Duration at .050 in. cam lift: 216 intake/228 exhaust
* Gross valve lift: .454 in. intake/.480 in. exhaust
* Lobe separation: 112 degrees
* RPM range: 2,200 to 5,200

ps lots of exhaust is good for nitous use right?

 

Yea that ones closer, thats a very streetable cam if its TPI you'll want to tune it a bit but thats nothing EXTREME

You're on the right track.

If its a strip car and you spend alot of your time on NoS then yea you want a good spread, but if you only shoot here and there the normal spread will be fine

 

Maybe this one

* Advertised duration: 262 intake/268 exhaust
* Duration at .050 in. cam lift: 218 intake/224 exhaust
* Gross valve lift: .462 in. intake/.477 in. exhaust
* Lobe separation: 112 degrees
* RPM range: 1,300 to 5,500

Or possibly this one.

* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .479 in. intake/.480 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 1,800 to 5,800

What do you think? I like the last but im not sure if the 114 lobe seperation will hurt me.

 

Realy though man thanx for the help Im really not to sure of myself when it comes to cams

 

Cams are deffinatly an art

But you got it nailed

 

I got a Crane Power Max hydraulic roller, 222/230 on mine and I think it is still mild. It has a slight lope at idle but it is still very streetable. You're positive that your cam is a flat tappet, cause didn't most tpi cars come with a hydraulic roller valvetrain. If you converted to a flat tappet, I would covert back to a roller if possible. I'm sorta confused on exactly what you have in your car right now. Do you have the stock lifters?

 

Well i just bought this one

Compu cam CCA-12-268-4

* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .479 in. intake/.480 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 1,800 to 5,800

This should hop it up a bit.

Do you guys think i can get away with the springs and lifters from the summit cam with only 1000 Miles? I already ordered the springs but i can cancel them.

Yes it is a flat tappet motor its out of a old 1970-75 camaro the guy I got it from wasn't sure. The heads are 87 and later so my tpi just bolts right on. and yes it is covertable to a roller cam but it need a bunch of extra crap and costs big money and after that I have to spend more money to buy the new cam and lifters. My rebuilder figured it out. He said $150 for regular cam, springs, and lifters or the conversion kit + Roller cam, springs, and lifters$700. so I spent the $550 on my Nitrous direct port injection. + getting new flat tappet cams is cheap as he**.

 

you consider siamese tpi now, that way you can utilize near full potential of the cam. You know that stock tpi starts dying off around 4800 rpm or so I heard. Or if you wanna wait, I'll have my super ram for sale in about a month or two.

 

Just want to throw this in,I was reading that a comparable crane vs. comp cam the crane will give up about 5hp to give you a better idle.This is only what I read so take it as you want to.

 

Naw I just went off with the grinder this week and cut out the space between the runners in the plenum and cut 3 inches out of my Intake Manifold and then sharpened the tips Between the runners. I want to see how much of a gain im going to get off of just that. 5500 rpm would be very nice. All I want is low 13s or maybe High 12's N/A and Ill be happy untill I blow up my tranny or/and my rear end.

 

383GT boy what are you thinking You need a big beefy cam, not these pansy cams...... the cams you have picked out are for like stock 305 engines....... this is rediculous!!! you can even burn chips to work on the idle......... A cam ive always been impressed with is the LT4 hotcam from gm perf. parts! post the specs on that thing???

 

You think I need even bigger than this? Remember I have 1.6 rockers and i want a good idle too.

* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .479 in. intake/.480 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 1,800 to 5,800

This is bigger than the lt4 hot cam i think.

 

Lt4 hot cam

Duration @ 0.050" Lift w/1.6: 218 / 228
Duration @ 0.050" Lift w/1.5: 216 / 226 (approx)
Lift w/1.6: 0.525" / 0.525"
Lift w/1.5: 0.492" / 0.492"
Lobe Separation: 112
RPM Range: 1500-6000

My new cam has a bit more duration and lt4 has a bit more lift.
Pretty close if you ask me. Besides I don't have a roller setup

 

your 224/230 will seem a little less agressive due to the wider lobe separation angle. You really won't loose anything but just thought I should let you know the only signicant difference in this case.

 

I c
But its still pretty similar.
Thanx for the input though.
So do you guys think I could get away with the springs and lifters that came with my old cam? only 1000 miles on them

 

If your cam kit already comes with it, I would go ahead and change it for the added insurance because you don't know if your stock springs and lifters can handle it. You know the old saying, "better to have it and not need it, than to need it and not have it" and then when its to late, it could cause some damage.

 

No it didnt come with them and they wanted 45 for springs and 66 for the lifters. That is way too expensive. It would cost me like 200+ dollars for the cam swap im just going to try to reuse the old lifters i think.

 

Just got done pulling the old cam. Boy that was easy. I thought it was going to be really hard from what everybody told me but any way im definitly going to reuse old lifters their is no wear pattern on them at all. Thanx for all of your guys help and input so far its going pretty smooth.