How do I find out without taking my intake off if i have a flat or roller taper cam?

Can somebody answer my question below adbout head portng, please.

thanks.

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89Iroc, M5, 305 TPI,Flowtech Headers 1 1/2, Hooker Y-Pipe 2 1/2, 3 inch over the axle, Flowmaster 80, No Cat, Aluminium Driveshaft, Ported Plenum, Air Foil, MAF Screens/Fins removed, K&N, Gutted Air Boxes, AFPR @45 psi, Ram Air, Throttle Body By-pass, Bumped Timing @12, Bosch +4, MSD 8mm wires, HP Rotor, Cap and Fuel Filter, Sensi Trac rear Shocks.

Other things coming soon: Fully Ported Head, New valves, 1.6 rockers, Relocation of MAT sensor, Better quality clutch.

 

An '89 IROC will be equipped with the hydraulic roller cam/lifters. The only way it would be different would be if a previous owner had swapped a flat tappet cam in it's place, highly unlikely. The only way to tell without pulling the intake is to look at the cam gear. The roller cams have a slightly different bolt pattern (I emphasize SLIGHTLY), the spacing is just a bit different.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

Actually, Mark, there is a ANOTHER way to tell. Yank the valve cover, put on some rocker arm clips to deflect the oil and start the motor. If it's a flat tappet cam the pushrods will spin when the motor is running. If they DON'T spin, you have a roller tappet cam.