so i have ssm stage 2+ heads and a comp cam 903 cam...

i get it all together, and some of the rockers have perfect lash, some of them are just at 0 lash, and some of them are loosey goosey.. so i get a oil pump priming tool, and prime the pump and turn the engine by hand until i get oil out the end of the pushrods..

as of right now there are 2 rockers that aren't even to zero lash..

I was always under the impression that all of your pushrods should all be the same length.. but with these engines having non adjustable rocker arms maybe that isn't the case???


my only other thought was that maybe i need a few new lifters?? (not priming correctly)

any thoughts on the subject?

 

The lifters are pretty cheap, I'd go ahead and get them, and get a push rod length checker to make sure you get the right stuff.

 

i'll get new lifters and see if that helps.. i ordered a pushrod length checker yesterday..

if the lifters dont take care of the problem, is the only way to change the pre load per lifter is the length of the pushrod? (IE up to 12 different length pushrods)?

 

Uuuuuhhhhhhh, not sure, haven't had that issue yet lol

 

hey ryan, do you know what the range of acceptable crush is on our lifters? to determine pushrod length..

I changed my lifters and it tightened it up, but only to zero lash..

 

I have spent the past hour digging through all of my Ford manuals, and they say nothing, but that's because in their eyes, and most cam manufacturers, if it's stock, don't worry about it, just replace the parts with the same stock part.

What length checker did you get? The Comp Cams one is really good, you can actually check your preload with it to insure proper fit.

I want to say the "crush" to be in the range of .020 and .060, it seems every cam company agrees with that. if you REALLY want to fine tune it, do some more research and see what end of that +/-.040 range you want to be in.

 

If you want to be accurate, measure the travel distance of the plunger in the lifter. Divide in half to obtain 1/2 travel distance number. Adjust valve on cam base circle to zero lash, with adjustable pushrod, measure pushrod length, and add 1/2 plunger travel distance to obtain needed pushrod length.

 

I did the same thing ryan; looked and looked and looked... it says what the 4.6 should be, but not the 3.8.. comp cams had a number on their paperwork, but i cant find it..

seems like .020-.060 sounds about right...

half crush would be like .180 and there is no way thats right..

 

I'm curious what is this 903 cam?