[427 2X4]

Anyone know the slot measuremnet for stamped steel rocker arms. '67-'68
396 heads. Also where is the cam id #. I pulled the timing chain thinking it would bebehind the sprocket on the cam....NOT!!!!

 

[SWHEATON]

Stock rockers can handle up to approx .500 lift,over .500 liftthat you need the long slot rockers if staying with stamped steel rockers.

If i remember correctly the long slot rockers have an "L" or "HP" or something like that stamped on them to designate they have the longer slots so look for that.

Unfortunately i dont know the exact meas of the slot on a std vs longslot rocker.

I have seen a few cam id's stamped on the back end of the cam so maybe thats where it is on the cam in your motor.

Scott

 

[GOSFAST]

Stock vs. Long Slot BB Rockers

Anyone know the slot measuremnet for stamped steel rocker arms. '67-'68
396 heads. Also where is the cam id #. I pulled the timing chain thinking it would bebehind the sprocket on the cam....NOT!!!!

(Name?) The stock rocker slots will measure approximately .700"/.720" across the slot, the "long-slots" will measure .750"/.760". But read the rest!

I will add this here and it's kind of important. This measurement you are looking for can actually vary from vendor to vendor. I only recently discovered this while looking for the set of stock ones on the LS-6 mentioned below. I have about 400/500 stock BB rockers in inventory, assorted vendors, and measured them by the application. It seems as though the stock slots and the long slots have somehow become intermixed!!! Not here, but at the separate sources. My guess is now they would all be considered long slots. Rather than produce 2 different rockers it's less expensive to make 1 design. The mfr's won't let this out however. Next set someone other than myself uses may want to "check the measurements"! Guy's building units for a living know this happens often. I'll can give you this example, I believe Fel-Pro's performance intake gasket #1204 and the stock LPG truck #MS90322 is the same but packaged different. The 1204's are more money because of the packaging? As a rule, the long-slot rockers generally were slightly higher in price also than the "standards".

Most stock rockers produced now should go well past the .500" because of what I said above. I have an LS-6 with a .560"/.580" cam installed with 16 stock G.M. rockers, by the part number, running on it now. No problems. It only nets about .540"/.560" after the lash however.

Thanks, Gary in N.Y.

P.S. As for the cam, most are marked at the rear.