MustangWorks.com : Ford Forums - View Single Post - Got my heads back today...may have a problem

82 GT · 07-26-2003, 11:22 PM

shaggy , I'm not positive what pistons I have. I bought the engine rebuild kit from Summit racing. There are are 4 half moon valve reliefs in them and the pockets are about 1/4 deep.(guess)
Tonight I checked the piston/valve clearance. Here is how I did it:
I clayed the top of #1 piston, installed the intake/exhaust rocker arm/pushrod assembly and turned the crank 2 complete turns.
I removed the head and found no valve marks in the clay at all.
The lifters were pre-loaded and the test was done without a head gasket. I guess that means I'll have plenty of clearance with the head gaskets installed.
I'm running the COMP CAMS 274 extreme energy cam(hydraulic)
with 230/236* duration @ .050 and .519/.523 lift.
The machine shop guy predicted that I probably would have any valve marks in the clay when I checked the clearance.
He said with the engines he has built(Ford), he doesn't usually run into piston/valve clearance until the lift is well over .500 or someone is running TRICK FLOW HEADS due to the different valve angles.

07-26-2003, 11:22 PM	#9
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	shaggy , I'm not positive what pistons I have. I bought the engine rebuild kit from Summit racing. There are are 4 half moon valve reliefs in them and the pockets are about 1/4 deep.(guess) Tonight I checked the piston/valve clearance. Here is how I did it: I clayed the top of #1 piston, installed the intake/exhaust rocker arm/pushrod assembly and turned the crank 2 complete turns. I removed the head and found no valve marks in the clay at all. The lifters were pre-loaded and the test was done without a head gasket. I guess that means I'll have plenty of clearance with the head gaskets installed. I'm running the COMP CAMS 274 extreme energy cam(hydraulic) with 230/236* duration @ .050 and .519/.523 lift. The machine shop guy predicted that I probably would have any valve marks in the clay when I checked the clearance. He said with the engines he has built(Ford), he doesn't usually run into piston/valve clearance until the lift is well over .500 or someone is running TRICK FLOW HEADS due to the different valve angles. __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.