bountyhunter Posted September 3, 2006 Report Share Posted September 3, 2006 any one have any idea why my pushrods are bent after most races.... one race i broke a rocker and i belive its the reason i bent several push rods on one side but every time i race now i find one push rod on either side thats bent..... is it cause from bad rockers? over reving? any ideas. it doesnt mess up the lifters or any thing. i just pull the bent one out and replace it and it runs like a champ for about 25 to 30 laps then it happens again but in a differ rocker. any ideas? Link to comment Share on other sites More sharing options...
Truck99 Posted September 3, 2006 Report Share Posted September 3, 2006 How much lift and what type of rockers? Long slot or stock? Some "lightweight" pushrods just don't have the wall thickness to stand up to racing revs. If your rockers aren't causing the interference, you might consider changing to a heavier wall set of pushrods. Link to comment Share on other sites More sharing options...
poorboy Posted September 3, 2006 Report Share Posted September 3, 2006 Springs coil binding or need long slot rockers Link to comment Share on other sites More sharing options...
HiTech Posted September 3, 2006 Report Share Posted September 3, 2006 Springs coil binding or need long slot rockers poorboy my thought to just didnt say that this morning thinking i was dreaming . Link to comment Share on other sites More sharing options...
bountyhunter Posted September 4, 2006 Author Report Share Posted September 4, 2006 there stock rods and rockers. of course that could be the problem in itself. Link to comment Share on other sites More sharing options...
poorboy Posted September 4, 2006 Report Share Posted September 4, 2006 I think if the cam is over like .450 the rockers don't have a long enought slot. Link to comment Share on other sites More sharing options...
HiTech Posted September 4, 2006 Report Share Posted September 4, 2006 I think if the cam is over like .450 the rockers don't have a long enought slot. what would fix that plus 100 s you think. he may be flowting valves . that isnt spelled right .then again i could be off my rocker . Link to comment Share on other sites More sharing options...
poorboy Posted September 5, 2006 Report Share Posted September 5, 2006 Long slot rockers will fix that Link to comment Share on other sites More sharing options...
bountyhunter Posted September 6, 2006 Author Report Share Posted September 6, 2006 thanks i will give it a try Link to comment Share on other sites More sharing options...
JamesHigdon Posted October 1, 2006 Report Share Posted October 1, 2006 I had essentially the same problem on a high performance street motor, after long periods at high rpm all kinds of nastiness was happening in the valve train. We ended up blue printing the valvetrain and the pushrods where .010 too long because of decking the heads. I would assume you have done this but if not it isnt that bad, most speed shops sell adjustable push rods and SBC pushrod length checker. My first setup was cat roller tips with stock pushrods, then comp rollers with stock pushrods, broke all kinds of stuff both times. Ended up with long slot stamped steel rockers, good crane chrome moly pushrods, arp studs and "Z28" style spings and have gone three years of abuse with not a single issue, drag racing, autocrossing, towing and just about everything else. Hope it helps. Link to comment Share on other sites More sharing options...
Purestock3 Posted October 3, 2006 Report Share Posted October 3, 2006 I ran .496/.496 advertised lift With No Slotted Rockers 1.5 ratio Z28 springs 76cc chamber head never milled No Problems how much are your heads cut? Link to comment Share on other sites More sharing options...
abrungot Posted October 3, 2006 Report Share Posted October 3, 2006 Pure was your Block zero decked? Link to comment Share on other sites More sharing options...
Pacecar Posted October 6, 2006 Report Share Posted October 6, 2006 An easy and visual method to check for the correct pushrod length for roller rocker arms is to: Use a paint marking pen to paint across the tips of the valve stems (e.g. intake and exhaust for cylinder #1). Assemble the rocker arms and set the proper valve lash. Rotate engine a couple of times by hand. Then remove the rockers and look at the rubbing pattern on the tips of the valve stems. If the pattern is centered on the tip of the valve, then your pushrod length(s) is correct. Link to comment Share on other sites More sharing options...
bountyhunter Posted October 15, 2006 Author Report Share Posted October 15, 2006 thanks for all info. havent checked it yet cause of medical problems but i think the medical is finally done. apperently the doctor didnt fix the problem the first time so i was a repeat customer. but fine now and fixen to get back to work on that car. the heads i will have to check cause i dont know what they are milled too but i do know the cam is a 480 lift. and the rockers and rods r stock. thats probly the whole problem. just needs to hold to geater for the turky shootout then we will build a new motor so i will know exactly what i have. thanks for the info.... Link to comment Share on other sites More sharing options...
Purestock3 Posted November 22, 2006 Report Share Posted November 22, 2006 Pure was your Block zero decked? YES Link to comment Share on other sites More sharing options...
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