Can you tell me what vehicle the motor belongs to and what the 8th digit of your VIN # XXXXX?
the car is a 1985 monte carlo ss, the 8th digit is a G.....im wanting to put a larger cam mostly to sound better and perform a little better. im not wanting to change heads, wanting to know the stock numbers of cam lift and duration....and also the most i can go in lift and duration without valve and piston problems. i believe the lifters are hydraulic flat tappet
The original cam was indeed a hydraulic flat tappet cam. It is a .404/.415 lift and 202/206 duration @ 50 with a 115 degree lobe seperation.
As for piston to valve clearance, there isnt a spec for maximum lift and duration of a motor, but if you are planning on keeping the car streetable there is no way you will be installing a cam that will cause valve to piston issues.