273 rocker info please

[66fs]

Well there we go. Check your geometry, get a kit if wanted. Get a pushrod length gage. Order custom pushrods. Done forever.

 

[mad dog]

Thank you 66fs, i appreciate the discussion and your time...

 

[davescuda]

I still like to know more about the 273 rockers stampings. Are some 1965 or 1967 or over the counter?

 

[RustyRatRod]

I don't have much to add, but ive got 273 adj rockers on our 340, solid lifter setup. OEM ball/cup pushrods, factory length. Zero issues.
I have a couple extra sets of push rods if needed.

Yup and you'll likely not have any. What I like about those ductile iron rockers is, If you want to go to a .650 lift roller, you got enough rocker arm to do it. They are tough as nails.

 

[Oldmanmopar]

He is wants to run the factory 68 4 speed cam. Assuming he has the 340 rocker system all he has to do is inspect the rockers and shafts, drop the pushrods into the lifters and bolt them on.

Not saying you are wrong, but how much will he gain with perfect preload after spending how much money and the time to do it correctly?

Many of these replacement factory cams are reground from cam cores not having the same base circle . You should never think just because it has the same lift and duration that they are ground off of the same base circle.

Now if he just happened to locate an original Chrysler cam from 1967-68. Then you can just bolt on the rockers . Providing you are using heads that have never been cut or has block that was never square decked.

 

[RustyRatRod]

Many of these replacement factory cams are reground from cam cores not having the same base circle . You should never think just because it has the same lift and duration that they are ground off of the same base circle.

Now if he just happened to locate an original Chrysler cam from 1967-68. Then you can just bolt on the rockers . Providing you are using heads that have never been cut or has block that was never square decked.

Puzackly. Which is why you measure, measure, measure. I'd be willing to bet even on well over half of all stone stock engines that you could measure and find that even they don't have the optimum length pushrod.