Manton....Ive called and talked with them 2-3 times and they are REALLY nice to talk too and they know what their doing.

Not to hi-jack this thread but im going to be buying some pushrods shortly for my roller cammed 360 and dont know if a 5/6 x.120 will be ok or should I go with the 3/8 x .093???
Im having the same problem with my J heads. 5/16 will fit and I also grinded out the holes and think that the 3/8 will fit.

Mike I debate this too but my gut is to go 3/8, then again there are lots of SBF that go 8500 lus with 5/16's with a lot more spring and lift than this one. 220 seat/500 open. A shorter pushrod for a given cross section is stronger too (in compression). The higher the lift the longer the pushrod length, the more extreme the arc. The Achilles heel with the SBM is the 59 degree lifter valley angle which imposes more lateral forces at the lifter side tip and (applying trig) must also slightly reduce the net lift at the valve.

One thing I do pay very close attention to is the the rocker spacing on the shafts, I use shims to keep the lateral motion between the rockers on the shafts to a minimum which in turn helps minimize a lot of pushrod oscillation. On small blocks I also like to run grooved #2 and #4 cam bearings to keep constant 360 degree oil flow to the shafts

Thanks Ryan, that is what I suspected...I've seen some people that said they run the link bars up on their SBM's with no issues, but they must be running small cams with small pushrods.

BTW I'm running the Morel (Callies) USA made lifters, I know a number of GM LS guys that are winding these things up pretty tight with zero issues. I had to massage the valley in a few places for them to fit over the ribs but they seem pretty nice. Doug said they make lifters for several of the 'name brands' as well.

Just had a great talk with Terry Manton, SUPER NICE GUY.

I told him that the 3/8" might be a little tight with the shorter 6.55" length (the Morel lifter design is a bit longer than a lot of other solid rollers apparently) so he suggested I run one of his (apparently exclusive to Manton) 11/32" x .120" wall pushrod so that's what I've got coming. We had some good pushrod discussion and I know I'll definately be coming back to him again.

I talked with a guy named Allen. I was going with the same pushrod but I couldnt because(I think) the cup wasnt big enough with my Crane roller rockers. Make sure you dont have the same problem.

Which pushrod would be better??
5/16 x .118 or 11/32 x .120

Arent they kind the same?? Only a 1/16 and .002 thicker.

SBM guys turn a lot higher than my projected 6800 using only 5/16, Terry suggested that I try these out. My cup and ball is all 5/16 and the Comp pro-mags have lots of clearence so i should be all right.

Mike remember the effect diameter has on Circumference .125 = ~.393 more perimeter wall surface, since my pushrods are only 6.55" long (due to the longer roller tappet body/ higher cup position), these pushrods should be plenty strong and still comparatively light.

Terry said 48% stronger (less deflection prone)than a 5/16 but 48% weaker than 3/8

Hey Wize...I too am running a roller cam and my pushrods measured around 7" and Allen said that since they are only around 7" that the 5/16 x .093 would be ok and not flex but im thinking of going to the 5/16 x .118 to be sure.
Im only going to push it to about 6500 rpm's

Mike , I'm with you, I just want to run as big a pushrod as I felt I could fit in there and the 3/8 was a touch too tight, the 11/32 weren't all that much more, cheap insurance I felt since I'm gonna be leaning on this thing a lot.

Terry made a good point that if your pass through in the head is borderline tight but not binding it's good for the pushrod because it acts like a guideplate in that it dampens the harmonics. Both ends of a pushrod pass through a non-linear arc so the rod oscillates/flexes i think more than people realize.

I cant remember what they told me but I cant run the 11/32 pushrod so I guess its the 5/16. I think it was because of my Crane roller rockers and the size of the adjuster.