Safe 360ci valve spring compression height question

I recently bought a Mopar Performance pre-magnum short block. I am using
a set of rebuilt stock 1976 heads with stock valves and stock 1.5
rockers. I put the MP .430 int/.450 ext. cam in there with the exact
valve springs and everything that MP recommends to be installed with
this cam. The problem is that the Mopar Engines book lists this spring
as having a 1.18 soild height and on my engine (and any stock engine)
the exhaust valves are going to reach 1.20 and the intake 1.22 with this
setup. The Mopar Engines book state that you should have at least 0.10
distance between the solid height of the spring and max valve lift and I
am only left with 0.04 int and 0.02 exhaust (installed spring height
varies from 1.65-1.67) and this is with using the recomended parts from
Mopar. Can anyone shed some light on to this?

TIA,
Brett

 

First you stock stamped rockers are likely closer to 1.4 to one than the
advertised 1.5 to 1. I've never seen an RV type cam .430/.450 lift come
go anywheres near coil bind on a small block!!
Don't worry be happy.
Barry A. Lee

 

How much is a small-block short block these days? And does it
_really_ come from Chrysler? (I bought a 318 short block about 16
years ago from a Chrysler dealership. It was built by a re-builder
called "Ontario Reman" - had a metal tag pinned to the front of the
block with the rebuilder's ID)

 

The other day I put a solid lifter in the #1 intake and set up for zero
lash. When I measured the max lift the spring was at 1.21 which is only
..03 over the solid spring height of 1.18. Isn't this going to overstress
the spring? Has anyone built a motor with the springs this close to the
solid height without problems long term?

Brett

 

Was about $1,250 before taxes. I think there was something on the box
the engine came in about being made in Canada but there seems to be alot
of parts made for Chrysler there. Looks to be a good quality engine I
just don't want to destroy it with too little spring clearance. I had to
swap out the .509 lift cam for the smaller one for use with my '76 stock
heads. Also selling the .509 cam and timing chain set if anyone is
interested.
http://fbody.kicks-ass.net:8000/enginepartsfs.html

Brett

 

But how did the coils look! If their is space between then don't worry!
Barry A. Lee
Or go to the P5249847 spring.
If it did not coil bind i wouldn't worry too much. I think your over
thinking their conservative specks.