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#1
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Sanborn, to bush or not to bush adj. rock arms?
Mopar shows 1.5 and 1.6 bushed and non bushed stock type adjustable rockers. With the bushed it's a must to run banana grove shafts. Is there any advantage to use the bushed ones? How would it effect valve train motion if any?
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#2
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I think the bushing only helps to maintain rocker arm life. And, if you use them on a race engine, probably are not necessary.
There is a problem with the nodular iron rockers. Based on my experience with Mopar iron rockers(W2) of about 25 years ago, the actual ratios are all over the map. I seem to recall ratios varying between 1.39 to 1.52 for what was supposed to be a 1.50 rocker. I know we went through about three sets carefully measuring and sorting them into matched sets. I made a jig and rebored the worst set to correct them-It is a pain in the backside. Unless your rules require stock rockers, I would buy a good set of aftermarket roller rockers. Don't feel bad, GM and Ford has the same problem. |
#3
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I haven't used the Mopar rockers, but like sanborn mentioned many shops bore the rockers out and install bushings to correct the rocker ratios.
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#4
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My machinist, who's been doing hiperformance stuff forever, agrees with Mopar, that it adds longevity to the shafts and rocker arm. Kind of like using foating wristpins in a rever.
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#5
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Thanks guys. I new the stock rockers were bad about not having the correct ratio. I would think that a stock type from comp cams would be better. Has anyone every checked them? I have to run the stock type, but I don't where it says I'd have to have a factory number on them.
I've always used the floating piston pins on race engines so I may look into using them on the rockers too. Right now I'm just trying to get as much info as possible together before I start my next project. I guess next step is to see if I can get a good set of aftermarket stock type rockers. Looking through the mopar book for ideas when I saw the bushed and unbushed just surprised me. I'm used to using the aluminum rollers myself. |
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