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Author Topic:   opening up pushrod slots
racer17j
Dirt Forum Champ
Total posts: 1569
posted May 04, 2003 12:41 AM UIN: 54865418
had a couple push rods bent tonite was wondering if i need to open the holes up i'm running stock length rods 510 lift cam and 1.5 long slots i was looking in my midwest book and ythey have the louis tool but it says it's for if your useing 1.6 rockers so wasn't sure if i could solve my troubles that way or not

rico 08
Dirt Freak

Total posts: 372
posted May 04, 2003 09:38 AM
If i remember right you are running z-28 springs right?You need to check for coil bind,the pushrod slots should be plenty big except maybe for 1.6.

racer17j
Dirt Forum Champ
Total posts: 1569
posted May 04, 2003 11:18 AM UIN: 54865418
i considered that but think i would have had more than that bent if so something to look into tho

jnewman44
Dirt Full Roller

Total posts: 72
posted May 04, 2003 03:21 PM
I run vortecs and guide plates If your running guide plates you can drill the holes with a 1/2 drill bit, Thats a suggestion for vortecs, they have round pushrod holes anyway and use self aligning rockers.

racer17j
Dirt Forum Champ
Total posts: 1569
posted May 04, 2003 09:07 PM UIN: 54865418
i run stock junk no plates or guides or anything fancy like that on my motor this is as high dollor as i get 500 bucks in her this year lol

madmodshoe
Dirt Forum Racer

Total posts: 89
posted May 04, 2003 09:11 PM
guide plates will fix your problems somewhat. Bent pushrods are a sign of either poor geometry or poor maintenence. Check lash and length of pushrods.

racer17j
Dirt Forum Champ
Total posts: 1569
posted May 05, 2003 07:46 PM UIN: 54865418
no lash hydrolic cam only about 20 laps on the motor think some shorter rods might help?

ryan
Dirt Freak

Total posts: 431
posted May 05, 2003 09:08 PM
Take a black marker or some sort of blueing compound and color the end of the valve, put on your rocker, set the lash while on tdc on #1, rotate the motor by hand two revolutions back to tdc on #1, take off your rocker. If the wear spot on the marker is smack dab in the middle you are good to go. If its on the exhaust side you need a shorter pushrod, and a longer pushrod if the wear mark is on the intake side. If you do need to go to a different legnth you can buy adjustable pushrods from speedway. Hope this helps.

66jj
Dirt Freak

Total posts: 353
posted May 05, 2003 09:39 PM
buy a pushrod length checker, made by moroso, about 10 bucks.

you should check for coil spring bind, and if you have so called z 28 springs its not enough, they can bounce the valve upon closing if the pressure isnt enough..

i would get long slot rockers on there 1.5.

are you studs pinned, or ***** in at least, if not when they start to pull out, you will get lots of lash, and it can happen very fast.. this will surely bend pushrods.

jj

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