Mr Gadgets

I have not checked the springs yet, but they were 260 # and somewhere over 700 open. I have to go thru them again to see what condition they are in. I ran them before, not much time on them. Cam is .685".. kinda whimpy.

Johnny DCB

Thats encouraging to hear.I just looked at a friend of mines blower motor and he lost an Isky roller,not looking good.

GPM

Do whatever you feel is best but, the 3/8 heavy wall push rods would be fine. Just for fun I checked the ones my brother ran last season not a mark on them. He was running a .748 lift cam, springs were 285 & 730. How many degree difference between your advertised and .050 duration?

cstraub

GPM,
I think Mr. G said he is running 11". The heavy wall 3/8" in that length is not a good idea. Your brothers may no have any marks on the pushrod due to the fact there is plenty of room through the head and the deflecting pushrod has not touched it. Deflection will put microscopic stress fractures in the tubing. The tell tale sign a pushrod has been flexing is to hold one end in your hand downward and hit it with a piece of steel. If it rings it is okay, if it is a muffled sound then the rod is cracked.

Chris

GPM

Chris, I'll check them tomorrow, the .080 wall ones that we replaced had marks on every one of them. The .135s were mark free, but I'll check them. I ran into this problem last year when I had my engine on the dyno. I was told .080 was just right for my application, after I bent all 8 exhaust pushrods the tech at Trend agreed I should run the 7/16. My push rod length I believe is 10.950 on the exhaust. I agree if Mr G can use the 7/16 it couldn't hurt, it's not much cam, does he see full spring pressure.

cstraub

Manton deserves credit for that "quick check" on the pushrod. Terry put boss of years ago on to that when our shop was just getting our feet wet with some 805 CID IHRA Pro Stock stuff. We had severe issues with pushrod deflection.

As far as Mr. G's spring pressure if he knows the inch rate of the spring then you can calculate deflection and get the spring pressure. But remember this, you have to take the spring open load times the rocker ratio and thats how much pressure the pushrod is seeing. So if he is 700#'s open and running 1.7 rockers then the pushrod has 1190#'s on it.

GPM

Chris, I still agree he should run the 7/16 if they will work, what can he do if they don't fit. I'm not arguing, just looking for a solution.

cstraub

Clearance them out and then use Brodix's pushrod hole liners. I know your not arguing. . .never took it that way.

Johnny DCB

7/16 two piece with tapered ends should be what Im looking for then?

Mr Gadgets

Had to work on the grand kids swing set last nite.. still no progress on the motor. I will try ringing the push rods, good idea!!

Hey what rings do you guys run anyway? Gapped or gapless? Seen any improvements with the Gapless and which ones, top ring, second ring, CA or Total seal.. what do you guys perfer. My buddy is ahead of me on motor assembly and he was wondering what the pro's thought..

Thanks for all the input.. getting an education here.

Dick