my buddy's 89 Iroc has the peanut cam in the 305tpi. Its a convert. with 195 stock hp. He needs somethin that idles good, and makes alot more power. Is the L98 cam good? I think my 89 G92 has it and it is alot faster than his. Any help is great.

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1989 Iroc-Z. 305TPI 5spd, G92 (230hp/300ft/lbs). 91-92Z28 groundeffects. Corvette Admiral Blue Metallic paint. Thermomaster chip, 160*stat & fan switch, Bosch +4 plugs, MAF screens removed, custom ram air, Flowmaster cat back, K&N, adj. fuel pres. reg.
72,000 miles. SWEET!!

 

You know, i own a 1986 IROC with a wimpy cam too. I remember in SUMMIT there was a cam for 305 TPI they had, that they installed on a 1986 IROC Camaro TPI, that gave 40 more horses, and places the torque and hp a little higher up. and took a full second off the 1/4 time.

of course, who knows if it is true, but im sold, i want to pick one up sometime, and see how good it really is. but just a suggestion, because i also have the stupid peanut emission cam

 

DESCRIPTION:
Up to 40 more horsepower for your TPI engine

Stuffed in an '86 IROC Camaro with a 305 TPI motor and an ADS Super Chip installed, our TPI cam kit made 40 extra horsepower and knocked almost a full second off the IROC's 0-60 times--and the computer worked perfectly. These kits include the cam, lifters, springs, retainers, and lube. If your car has more than 30,000 miles, we suggest you add a new timing chain.

Sold as a kit.

PARTS:

Part # Description Price Available

SUM-G5000 Chevy: 1985-87 Camaro 305, 350, 1985-87 Corvette 350; Pontiac: 1985-87 Firebird $159.99 Add To Cart


TECHNICAL:
This cam kit is designed for 1985-87 non-roller camshaft TPI engines.


--Didn't SLP originally make this ?


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Da Boid

- 4 out of 5 people think the 5th is an idiot

 

Since you have an 89, your engine has a roller cam. That kit will not work with your engine. Look at a GM zz-4 cam, a comp cams 303 or 304, or a crane compucam 2030, 2031 or 2032. All of these are hydraulic roller camshafts. Call up crane and compcams and talk to their tech dept. Also do a search in the archives. I am going with the zz-4 cam in my 87 this spring.

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87 IROC-Z 305 TPI gears, exhaust, converter
14.70 at 94.1 mph with 1.90 60'

 

My friend used the smaller of the SLP cams for his 89 RS LO3 that he converted to TPI.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

I just got my car back we rebuilt a 305 bored 40 over and put a 265 comp cams in it and it sounds real good, i went back with vette heads and 10:1 comp it sounds real good and idles just fine i dont have the chip or rocker arms but the car is very fast compared to the old engine im hoping maybe to sink into the mid 13's

 

I e-mailed comp cams regarding their HR262-12 cam and here's the reply I got

"the HR262-12, p/n 08-300-8, would do an excellent job in your
engine.It is designed to be computer friendly, an make excellent power from
1000-5000 RPM"

I'm tempted to get it but it's a massive job fitting it.

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1987 IROC-Z Auto (LB9)
Black/grey with the stance of a streetfighter

Mods
Custom exhaust. 4 Inch pipe from the headders all the way back to a single muffler at the rear. No Cat.

Future mods:
K&Ns
RAM Air
New Underdrive pulleys-either March performance pulleys or Auto Specialties Performance
Air foil

 

Here Here! I am a big fan of the XE262 / XR262 grinds of Comp Cams. Their 214/224 degree split duration cam is very lively, and with the 12 degree LSA, it should work well in a TPI equipped car.

See my little flat-tappet XE262H cam in my SIG? Combined with some home-porting of my own heads, headers, stall converter, and an old used Edelbrock Performer manifold, my motor is nearing 101MPH in the quarter mile. YMMV, of course!


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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

 

whats up,
Dont listen to deadbirds opinion u hava an 89 iroc which uses roller cam i suggest and im guessing everyone will go along with me get a set of accel cam part number is #74211 its fully emissional and if u add aftermarket intake manifold rocker arms headers youll be rolling with that iroc and destroying mustangs out there good luck