Piston to valve clearance

[SSStang]

Just want to see if this maybe a issue. I'm getting a set of trick flow track heat heads and trick flow stage two cam on a stock block. Is there going to be a issue with piston to valve clearance? I plan on checking during assembly but just dont need any more down time once I tear it apart. The head part number is 51400010. The cam specs are
Part# TFS-51402001
Cam Specs:
Basic RPM Operating Range- 2,500-6,000
Duration @ .050- .224/.232
Lift- .542 int /.563 exh
Lobe Sep- 112*
Grind #- HR-236/359-2S1-10

 

[SSStang]

No help?

 

[Rick 91GT]

That cam is very tight in a stock piston, the stage 1 will clear with no issues.

 

[SSStang]

Ok thanks. I m going to give it a shot going to check and recheck PTV clearance on install. I hope it works.

 

[DavidEwers]

No matter what I would do a valve to piston check, using the old clay method. Make sure if yoy retard or advnce the cam at a later date that you recheck.

 

[SSStang]

Well didn't work out. Unless Im doing something wrong. The valve hits the piston. I tried to retard the cam and still the same thing. I guess I have to get a different cam.

 

[90lxcoupe]

what rocker ratio do you run?

 

[SSStang]

trickflow 1.6
Just to double check after zero lash turn 1/4 to 1/2 to set preload? That is what i'm doing when checking the PTV and I made my own solid lifter by taking a lifter apart.

 

[NIKwoaC]

trickflow 1.6
Just to double check after zero lash turn 1/4 to 1/2 to set preload? That is what i'm doing when checking the PTV and I made my own solid lifter by taking a lifter apart.

You check with a solid lifter at zero preload. If you preload a solid lifter, you're actually lifting the valve off the seat and reducing "true" clearance. Preload is for final assembly with hydraulic lifters, not for checking PtV with a solid lifter.

Just stick the rocker on the stud, make sure everything is aligned, and spin the poly lock down by hand. With the other hand, hold the pushrod and kind of jiggle it up and down to feel for play. When you don't feel any play in the pushrod, you're at zero lash; stop tightening the poly lock. (At this point, the poly lock should feel tight, anyway.)

Spin the engine over twice, tear everything apart, and check the minimum thickness of your clay.

THAT ALL SAID, if you're hitting the piston with 1/2 turn preload, you're probably still not going to have enough clearance (if any) at 0 preload.

 

[SSStang]

Very good info thanks. Going to give it a try tonight. Hope it works. I want to get the car back together. If I have to order a new came it wont be here till monday at the soonest.

 

[SSStang]

Well ended up have plenty of room once I set the rockers up right.

Thank you for the help!

 

[v8stang289]

Did you measure the actual clearance? Even if it clears now if there is not enough margin you could still have valve to piston contact when the engine is running and parts are expanding, etc. I'm not questioning your ability, just trying to make sure you don't end with an expensive problem.