Quote:

---

Iam reassembling my 383 had heads plained ( not very much) rockers seem to be very tight on valves when valves are closed stock shaft and rockers, rockers are riding valve tips ok. push rods are tight on closed vales. Should I install shims and how much? Push rods should be able to turn on a closed valve? Thanks Bob

---

I assume your talking a hyd cam.... get one of the
valve on base and start pulling the shaft 1/4 turn
at a time on each bolt till the push rod turns freely
and count the 1/4 turns... then tell us.... if you
know how much you had the heads cut we can tell

Quote:

---

Iam reassembling my 383 had heads plained ( not very much) rockers seem to be very tight on valves when valves are closed stock shaft and rockers, rockers are riding valve tips ok. push rods are tight on closed vales. Should I install shims and how much? Push rods should be able to turn on a closed valve? Thanks Bob

---

Quote:

---

Quote:

---

Iam reassembling my 383 had heads plained ( not very much) rockers seem to be very tight on valves when valves are closed stock shaft and rockers, rockers are riding valve tips ok. push rods are tight on closed vales. Should I install shims and how much? Push rods should be able to turn on a closed valve? Thanks Bob

---

No , you do not install shims , shims are for correcting valve tip to rocker arm geometry , not making up for head/block milling.

It's a hyd. lifter not solid , the lifter should be compressed some and under that pressure the pushrod will not spin freely .

---

John is correct... no shims... IF it is compressed
to far then you need shorter push rods... does any
one know the dimension from the shaft center line
to the push rod center line(even a close spec)..
that will help also to figure out the compression
of the lifter... the reason I ask is I'm not home
to get any measurements or any books on hand

Quote:

---

You didn't step up to a bigger cam did you?Best cure is to put adjustable rockers on it along with some lash caps.

---

Exactly, no more bs guess work...............

Quote:

---

I keep thinking this: it's a hydraulic cam, right? There is supposed to be no lash in the system when the valve is closed, that's what the hydraulic lifters do.
There's a spring inside the lifter that pushes the cup up. If you had slop in the closed condition the pushrods would be too short.
The question is, what kind of preload are you getting on the lifters. In other words, how far down in the lifter is the pushrod pushing the cup?

R.

---

Correct..... the other guys are jumping the gun...
if its .010 to .015 farther down in the lifter it
wont matter... so why BUY rockers for no reason...
yes a adjustable push rod is the easy way but if he
doesnt have one then a little math works fine

Quote:

---

Iam reassembling my 383 had heads plained ( not very much) rockers seem to be very tight on valves when valves are closed stock shaft and rockers, rockers are riding valve tips ok. push rods are tight on closed vales. Should I install shims and how much? Push rods should be able to turn on a closed valve? Thanks Bob

---

Also.... NO the push rods should NOT turn... they
have pre-load on them pushing the lifter cup down in
which is what the hyd lifters need to make things
quiet

Quote:

---

The reason for adjustable rockers Mike is to step up to the 20th century already.............

---

Its STOCK.... I like spending others money also

Quote:

---

I get it BUT Isky iron or a cheaper version takes the guess work out and you can even play w/preload like we used to at Pettis on the stockers.............

---

No I dont think you do get it... its STOCK... we dont
even know if he will EVER hit the track to see what
it might do..... I think you should buy a dana.. because
your 8 3/4 MIGHT blow up... get my point... we love
spending someone elses money

Quote:

---

You`re stuck in your ways and me in mine. ANYTIME a head is milled or valves sunk from valve jobs, the pre load`s out of wack period and shimming makes the already sucky small block`s sweep worse so adjustable rockers are the only LOGICAL solution...........I`m gonna go work out now..............

---

Never mind... I quit... you tell him what he needs