88Roc350TPI

Hi Folks,

If you see typing mistakes dont flame me..I sliced the end of my finger off removing a front wheel off an F-SuperDuty bucket truck at work (I HATE FORDS!!) So i got a huge thing wrapped around it till it heals.

ANYWAY,,, Here's what I have. 88 IROC-Z 350 TPI, 700R4, 2.73 rear with posi. Engine is stock, 140,000 miles, runs great but i want more power. I want a cam that will work ok with the current engine yet be able to use it again when i rebuild it. When I do rebuild it I dont plan to take leaping bounds with the engine,,,,maybe a tad higher compression and port the heads a little and port the intake/plenum....no huge mods. I plan to change the rear ratio to either 3.08 or 3.23 and a Trans-Go shift kit and misc other parts are on the way from Pro-Built as we speak. Theres an iroc locally here that the guy has done basically what i want to do here, he used SLP cam, not sure which one, its idle sounds a little lopey, but when he stomped on it, it didnt impress me much. Also hes gotta rip the motor out again cuz the dist drive gear on the cam is messed up from SLP. Oh ya, forgot to say, im gonna put edelbrock headers on it too, and i have flowmaster catback and gutted cat. UGH this one handed typing is a b-i-t-c-h. Im gonna have the nose off the car soon and its easy to rip out the radiator and condenser so i am not gonna remove engine at this time, Hope u all can help...thanx

ploegi

Call the cam manufacturer of your choice, and give them the info you posted here, and they should be able to make a recommendation to meet your needs. They can be most helpful when someone wants to spend money......

Have fun!

Kevin91Z

iTrader: (1)

One question, did your car start as a 350 or a 305? If its a 350 and you have the original rear end, you have a 2.77 9-bolt, and replacement gears for it are almost non-existant.

I really disagree with your choice of headers, Edelcrock's suck. Get SLP's, or Dynomax, or Hooker, or Hedman.

For a cam suggestion, check out the cam tech article on here and read those choices. For a mild 350 like you describe, a cam with 208-212 intake duration at .050", and less than .460" lift will work with the stock heads. You can use more lift if you change the springs on the heads. I'd recommend changing the springs anyway with your mileage.

I hope your finger gets better soon. Good luck.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
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88Roc350TPI

Yes, it originally came with a 350, 8 in the vin bla bla bla. Are you sure on this rear end thing? The car has factory 4 wheel disc brakes if that helps any. Not 1LE, it uses MKD 154 brake pads front and rear.

Also, why are edelbrock headers so bad? Besides SLP they are the only other co that appears to make headers that mount to the exhaust system in my car, I have 350 TPI, Im not going to pay $600 for headers (SLP=$450 + $80 for cat mounting kit plus $$ for the header mount kit + $$ for shipping.....IMHO TOO MUCH!! Plus I have a friend with SLP that the steering arm hits the headers.

I WANT A CAM!!! ANyone else with ideas?? Thanx

89gta383

iTrader: (5)

Search the classifieds section. There are a few ZZ4 cams there that should make you happy.

You must remember that if you go radical on the lift, you will have to change the valvesprings, so that limits your selection some.

88Roc350TPI

I dont have a problem changing valve springs...Is the lift too much for the heads though with the ZZ4 cam?? Thanx

poncho9789

As to your cam question it is a personal decision on your part and the mods you are planing. As for the rear as far as I know they only f-bodys they came under GTAs and Irocs. To find out which rear end you have get under the car and look at the rear diff if it looks somewhat like a dana60 rear and has 9 bolts in the rear diff cover than it is a good rear tough rear end but as stated above there are limited parts for it. It is called a borg warner 9 bolt heavy duty made by holden which is GMs company in Australia. You can get parts easly from (drive train specialest, also TPIS now carries parts for this rear end. The largest ring and pinion ratio is 3:70s,people say they can get higher from down under but I don't know how reliable these people are or if you want to pay for shiping from australia. Anyways good luck on your car.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,LT1 24# injectors,GMPP LT4 hotcam,CompCams Pro magnum roller rockers, this car is currently under rebuild and restoration.

8Mike9

Re: SLP's pricing...head over to www.camaroz28.com, and look in the GP section, a guy has a rolling GP on SLP's, when he get's a certain # of orders, he places it...last I recall, he sells them for 375 w/air, 350 without.

Kevin91Z

iTrader: (1)

All 87-89 350 L98 f-bodies came with 9-bolt rears, either 2.77 or 3.27. Look at your differential and count the bolts in it. 9 bolts and a circular shape is a 9-bolt, and 10 bolts and an oval shape is a 10-bolt.

I like SLP headers because they have 1 3/4" primaries, not 1 1/2" and 1 5/8" stepped tubes like Edelcrocks. Larger headers mean more air flow out of the engine, which means more power. You need better airflow on a 350 engine with a cam.

I stand behind my original comments about picking a cam. Also, I very strongly suggest you get new valve springs along with the cam. The ZZ4 is a great cam, I used it in my engine previously. But I dont know if it will work in stock heads without mods. (mods meaning machining the valve guides and such.)

JoelOl75

You must machine the guides and screw in studs are a good idea with the zz4 cam.

88Roc350TPI

So what cams can I use that don't require a stud change or machining of the guides? I just want something I can put in now without having to take the heads off the car. Thanks.

JoelOl75

Stay at or under .480" lift. 114 LSA and keep duration under 220@.050 for a TPI and any cam will work fine with your stock heads and torque converter.

Don't quote me though... I should of said 'should' be OK

fmsracing

Get a Comp Cams part# 08-422-8 Extreme Energy Hyd. Roller. It has a intake lobe w/218 degrees and .495 lift and an exhaust lobe w/224 degrees and .502 lift. Have them grind it on a 112 LSA and have them grind the intake centerline on 106 (6 degrees advance), this will pick-up your bottom end torque while maintaining good top end. Then order the Conical Valve Springs part # 982. These fit stock heads but work with larger cams without machine work on the heads.

88Roc350TPI

Ok....Here's the cams im looking at at this point:

SLP 51002--206/212 duration at 0.050" .480/.487 lift

Crane Compucam 104225--208/214 dur, .438/.452
Crane Compucam 104224--214/220 dur, .452/.465
Crane Powermax 109821--214/222 dur, .488/.509

Comp Cams 08-300-8 206/210, .450/.480
Comp Cams 08-302-8 210/220, .480/.480
Comp Cams 08-409-8 206/210, .458/.458
Comp Cams 08-411-8 210/214, .474/.474
Comp Cams 08-412-8 212/218, .487/.495

Based on what I have (top of this post) Which ones of these would you rule out and which would you consider? Anyone running any of these cams?? Thanks everyone for your input.

88Roc350TPI

I just found this...on GM Perfomance Parts website it shows the specs of the original L98 cam to be 202/206 dur, .403/.415" lift and 115* lobe separation so if I stay under .480" lift I'm ok with my stock heads (I will change the springs regardless....Just dont want to do any machining at this point)??????? Basically looks like all of them I've chosen will give it a major kick in the butt compared to the stock cam....yes?? Keep the replies coming I really appreciate them. Thanks

88Roc350TPI

No more takers??? Does anyone run any of the cams I listed above or know of certain ones I should stay away from so I can shrink my list? Thanks

Mark 89Formula

Given this criteria I would pick one of the Crane Compucams. The smaller one (2031HR) will work better with your current 2.77 gears. If you are stepping up to the 3.27s then go for the larger (2032HR). You can add 1.6 rockers in the future if you change to a head that can take more lift.

maksik7

Hey 88ROC,

Sorry I can't help you with the problem, I'm looking for a cam myself and having your same problem.

You mentioned a GM performance website, can you please post the adress on here. I would really appreciate it.

-Max

88Roc350TPI

you can get to it by going to www.gmmgoodwrench.com