440 valve length.

[Robb]

quick question...

sanity check on valve geometry and adjustments:
the cam/lifters are hydraulic.

915 heads with new oversize valves are almost ready to come home from machine shop.  in talking about it with them, they said the valves they got for me were a little longer than usual and that they needed to use some special valve keepers and then add a few valve spring shims to get the spring pressure right.


MY CONCERN:
if the valves are physically longer, and the valvetrain (stock rocker arm and pushrod stuff) for a 4440 is non-adjustable...   are the longer valves going to cause a problem in either not closing all the way and/or hitting the piston (when normally they would not)

or do the hydraulic tappets compensate for this ?


thanks,

Robb

[Chryco Psycho]

it would depend on how much longer the valaves were & if the tips were trimmed off to the correct height , more then .040 will be a problem & the lifter will not compensate

[Robb]

cool thanks, Ill be sure to ask if they were trimmed.    The guy knows mopar somewhat but its possible they may forget about the valve train not being adjustable.

Thanks !

[moper]

It will most definately cahnge the rocker geometry. Whether the hyd tappets can compensate is another question only you can answer when you check the pattern. I would most definately check the swipe of the rocker over the valve tip. You may need to shim the shafts, which may mean longer than stock pushrods...

[Robb]

which sounds like the shop may have to put in some different valves then.   

update:

Made another call and I inquired about what all they did to the valves again, and after I mentioned that the valvetrain is non adjustable,  they finally said "oh yeah we trimmed the valves to correct length".   Ill definitly check it all out though

Apparently the valve were .040 to .060 over spec length. 


thanks again everyone.

Robb