440 Build - Cam Question

[Chryco Psycho]

moving the crank gear works the same as moving the cam gear so no problem , as long as your machinist set the valve tip height properly no worrys with lifter preload & no the lash is not adjustable with shafts valve to piston clearance can be checked with the piston 6* before & 6* after tdc & a dial guage , you can compress the valve spring & measure the distance before touching the piston 6* before is exhuast , 6* after is intake

[mikepmcs]

Thanks Neil.

v/r
Mike

[firefighter3931]

Mike, the method Neil described above is the most accurate way to check P/V clearnce or you can use the clay method. You will have plenty of clearance with that cam. 


Ron

[mikepmcs]

Thanks Ron,
this will be an engine in, heads on install.  I know, not the best situation but, i don't want to pull or lift the motor if i don't have to.  Just for info, clearance is good up to .520 ish, on a stock motor,  did I hear that somewhere or did I just dream it.

I was just wanting you guys to verify what I was hoping to be already true after research and info from here. 

I appreciate the info as always.

All I need now is a degree kit and i'm ready.   

v/r
Mike

[Chryco Psycho]

every engine is different but my experience is 520 is about where the retainer will get close to the valve guide & need more clearance , generally most piston combos are also good to .520 but each piston is different & especially with milled heads & or decks shoudl be checked , higher lift cams used with pistons with no valve reliefs will be the tightest combination

[firefighter3931]

  Duration has more of an impact than lift does so a longer duration cam will create more headaches. The 223*.050 k56 is conservative so it will fit with lots of P/V clearance. The .510-.520 is a good rule of thumb to follow for retainer to guide clearance. 



Ron