Lowbudgetkarter
New member
What size push rods will I need with hemi head cut 80,ss valves,55#springs,307nr cam?
Push rods
- Thread starter Lowbudgetkarter
- Start date
astrowrench
Member
Lil Long Son
WinstonSmith
New member
I would think so too....
Who has cut to fit push rods for this application?
Would it be advantageous to use a GX160 lifter and an even longer pushrod if required ( with a milder cam of course )
Seems to me I recall a briggs lifter could also be used but it is longer than the 200 ( not sure who said it or how it worked ).
modifiedman
Member
5.175 will do the trick and yes a 160 could be used too.Lot has to do with lift of cam and how much off the head was taken.
if still running a stock lift cam you could take .080 off and still be fine with stock length push rods but would not be the case
if now going with more lift.
if still running a stock lift cam you could take .080 off and still be fine with stock length push rods but would not be the case
if now going with more lift.
strokesb16b
New member
You have the 55lb springs installed in the head??
modifiedman
Member
JMO but a little to much spring should be in the 37 range
I run 356 with 32 and I know guys who run 26 with a 308
I run 356 with 32 and I know guys who run 26 with a 308
strokesb16b
New member
Please post a pic of the 55lb springs installed bc I have yet to see any done a hemi.
Lowbudgetkarter
New member
The head is at kart shop right now getting this done, why will the 55s not work they are enlarging spring pocket to accomadate? I will post pic when I get it back might be awhile
Many parts dealers have cut to fit pushrods for sale.
I like the longer lifters, shorter pushrods. Less pushrod flex.
55 lb springs is just fine won't hurt anything. I've been running 55's in my motors with 308 and stamped 1.2 rockers for years now with absolutely no problems, I keep the springs fresh too change about every 6 races and turn it 8200-8400 rpms. I've never run single springs in any of my motors, I'm running 60lb springs in my motor now with a 315 with arc 1.2's.
older n dirt
Member
I guess that I've been thinking about this all wrong, I've been running the GX160 shorter lifters and cut to fit moly push rods from NR Racing,... thinking I was running components with less weight. jmo
youngengines
Member
You have 55lb on a hemi head?
No haven't got into hemi yet, I didn't know you couldn't make them fit before I said that sorry, but if you could put them in there I cant see why it would hurt anything anymore than a 6.5. I know on a 6.5 I've never had any problems with them.
youngengines
Member
I wasn't trying to be mean, I hope it didn't sound that way. The problem I see, is the way I port (raise the intake port), it get's real thin at the spring pocket (the angle of the valve makes it that way).
youngengines
Member
Cool, just making sure. I like the Predators, as well as 196cc's too.
If it works for you do it. I won't say you are wrong. I'm just saying what I have found out through many years of testing by the major cam companys. Lighter weight makes a big difference on the valve side of the rocker but very little on the pushrod side. Also larger pounds of spring and rates make the longer pushrods flex more.
Lowbudgetkarter
New member
So will 55s not work&why