[1989GT]

Will these flow bettter or just the same as stock gt40p heads ?

I would say that those heads will flow better with the bigger valves(atleast some due to the valve job) but you really need to port the head to take full advantage of the bigger valves.

Will i be able to use stock vavle covers ?

Yes, but you may have to do a little work to them.

And i'm not too sure if i'll have piston to valve clearance issues. My cam is .499/.510 . Its the trickflow stage 1.

With 1.7rr that's .530/.542, I know there are a few guys running the stage 1 cam with 1.7's with out any piston to valve clearance issues. But the only way to know for sure is to check when you assemble the engine.


TFS-51402000
Valve Setting Intake: .000 in.
Valve Setting Exhaust: .000 in.
Advertised Duration (Degrees): 275 intake/279 exhaust
Duration at .050 in. Lift (Degrees): 221 intake/225 exhaust
Camshaft Lift: .312 in. intake/.319 in. exhaust
Valve Lift with 1.6 Rocker Arms: .499 in. intake/.510 in. exhaust
Lobe Separation (Degrees): 112
Intake Cam Timing at .050 in. Valve Lift:
Opens 3 degrees BTDC
Closes 38 degrees ABDC
Max lift: 108 degrees ATDC
Exhaust Cam Timing at .050 in. Valve Lift:
Opens 49 degrees BBDC
Closes 4 degrees BTDC
Max lift: 116 degrees BTDC
Firing Order: 1-3-7-2-6-5-4-8