There are several cam manufacturers that offer TPI specific grind cams. Just wondering what's the major difference between a TPI specific and others such as the ZZ4 and LT4 cams that alot of folks are using with TPI?
Thanks

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Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!

89 TTA #426 20th Anniversary turbo 3.8 bone stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, highly modded
95 Trans Am Conv.- LT1

 

basically TPI cams have two things going for them. The valve events are timed to take advantage of very long intake runner lengths for great torque. In other words they waste very little cylinder pressure that is gained by the ramming effect of long runners.
The second thing is minimal valve overlap so that vacuum is strong and steady which allows the computer to function as it was designed for smooth operation.

They also work very well with dualplane carburetor intakes.

ODB

 

To add to what OBD said, they are also all hydraylic roller cams to minimise friction and thus increase horsepower.
The reason I suggest the ZZ4, LT4, TPIS, LPE and SLP cams is because they are made for the TPI motors, where as the comp cams and such usually aren't. Now, a lot of people are using non TPI specfic cams and have wonderful success. But I think in a TPI motor, you should run a TPI cam, just my 2 cents though.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, 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 (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!