Hydraulic Roller Cam Button End Play

[LSS&B]

I have installed a hydraulic roller cam in a 440 that I am building.
I have 440 Source cam button 200-1170, nylon.
I have a stock timing cover that I primed with Rustoleum High Heat Gray, then baked.
440 source recommends endplay .005-010" (distance from cam to back of timing chain cover). Seems tight.
Is that the end play spec you generally use?
Length of button, front to back as pictured in .5 inches. Timing chain cover will not seat against block.
I am thinking of grinding down cam button in small increments, then using Play-Do on front of cam button with the timing chain cover test installed.
Anyone have the length front to back of a cam button that fits?
Is there a better way to measure this clearance?
Thanks

 

[RemCharger]

The Comp Cam ones seem to fit darn near perfect. The factory cover distorts pretty easy. You'll want to brace it ive had luck with the big washer trick, then shave to fit behind the installed waterpump. As far as tolerance, best case scenario is just enough for oil film. So their numbers are generous.
Are those ARP bolts?

 

[DeltaV]

You could use play-doh to check clearance, but we used this stuff (reprorubber) at work.

Reprorubber®

Also, I'm not sure those bolt heads are going to clear your cover...don't trim your button yet.

 

[dan juhasz]

They make hd covers to use with cam buttons, One of the companies sell different sizes.

 

[RemCharger]

They make hd covers to use with cam buttons, One of the companies sell different sizes.

MRE - Billet Timing Cover MRE - Billet Timing Cover

 

[Bird 426]

I had the back cam plug out " water freeze plug", and used a dial indicator. I also used the roller bearing cam button, not the nylon. The stock cover flexes quite easily. You won't have what I used to fill the space between the water pump housing and the timing cover. I used flox and epoxy resin, but you could use JB Weld. Scuff the water pump housing so that it will stick to it and wax or very thin tape on the cover. Crush your pump housing gaskets or torque them. You only need to to fill the gap to about the size of a quarter of half dollar. .010 is about right.
Less expensive than the $400. dollar cover.
Sorry, this picture was supposed to go to another thread!

 

[RemCharger]

I had the back cam plug out " water freeze plug", and used a dial indicator. I also used the roller bearing cam button, not the nylon. The stock cover flexes quite easily. You won't have what I used to fill the space between the water pump housing and the timing cover. I used flox and epoxy resin, but you could use JB Weld. Scuff the water pump housing so that it will stick to it and wax or very thin tape on the cover. Crush your pump housing gaskets or torque them. You only need to to fill the gap to about the size of a quarter of half dollar. .010 is about right.
Less expensive than the $400. dollar cover.

Exactly. It helps if the cam is loose enough to easily measure. The tight timing chain may hinder slightly