Stamped lifter clearance

[Bird 426]

Post #18, .015 might be better.

 

[gkent]

There's no reason at
all to be grinding anything on a stock
engine setup.

This raises the question of how many rebuilds you may have actually done !! In ANY rebuild its recommended to check all clearances, passages, etc.. Why? Because of a thing called "manufacturing tolerances" !! Its why clearances are published in manuals !! Who hasn't ground off flashing, opened up holes, found clearances that were too tight or too loose ?!?! I don't think I'd want you building a motor for me if that's your attitude !!

 

[1STMP]

Just wondering (if the engine was
running previously) why any grinding
is being done, even with new rockers
and shafts. Not trying to be
argumentive.
I just installed a new set of rockers
and shafts on a 440 (from 440 source)
with zero issues.
Checking clearances without having
everything installed (the pushrods)
is a guess at best.
Just my .02....

 

[Geoff 2]

For some reason, these rockers are slightly wider than original OEM rockers. Or.....if the OP bought new hold downs & spacers, it could be those that are slightly wider...
Doesn't matter which....
Post #5, easiest fix is to grind the hold downs. You do not need 0.015" of side clearance, a few thousandths is enough. The cylinder head bulk will be hotter than the rockers at operating temp. That means that whatever the gap is at room temp...it will increase slightly at operating temp.