It was decked and has Edelbrock heads and new a new cam. Tried a set of Melling mrp-157 7.234” push rod for the 340 t/a motor and they are almost touching the rockers.
I am in the process of finding the proper push rod length for my SB with 273 rockers and a hydraliclic cam. My question how far the stock adjuster need to protrude from the bottom of the rocker arm. Thanks
I would want another thread or two showing on the pushrod side. Just sayin'Krazykuda thanks for the list of threads. I have read most of them previously and am planning on contacting oe pushrods when I have better idea of the length needed. RRR thanks for the lead on the crane push rods. they they have a "working length" of 7.185, the Melling mpr-157 are 7.234. The .049 difference may or may not be what i need. As you can see from the photo this is how close the cup is to the rocker after setting the adjuster to zero lash plus one turn as per Racer Browns instructions. Also the cam is a Racer Brown EH-20 dur. @50 i220 e220 lift i.450 e.450. The geometry looks correct with the 7.234 push rods,
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The 7.234 pushrods are a quarter inch shorter than the 7.500 onesThe ball and cup diameters match up close to the factory solid lifter 7.500 rods. The 7.234 rods are just to long. Some would rub against the rocker and not achieve zero lash. From what I have found from searching different threads is that that the adjuster needs to be exposed any where from 1 to 2 threads or 1/4" to 9/32" to provide proper oiling to the push rod.
Krazykuda thanks for the list of threads. I have read most of them previously and am planning on contacting oe pushrods when I have better idea of the length needed. RRR thanks for the lead on the crane push rods. they they have a "working length" of 7.185, the Melling mpr-157 are 7.234. The .049 difference may or may not be what i need. As you can see from the photo this is how close the cup is to the rocker after setting the adjuster to zero lash plus one turn as per Racer Browns instructions. Also the cam is a Racer Brown EH-20 dur. @50 i220 e220 lift i.450 e.450. The geometry looks correct with the 7.234 push rods,
View attachment 1715624787
Krazykuda thanks for the list of threads. I have read most of them previously and am planning on contacting oe pushrods when I have better idea of the length needed. RRR thanks for the lead on the crane push rods. they they have a "working length" of 7.185, the Melling mpr-157 are 7.234. The .049 difference may or may not be what i need. As you can see from the photo this is how close the cup is to the rocker after setting the adjuster to zero lash plus one turn as per Racer Browns instructions. Also the cam is a Racer Brown EH-20 dur. @50 i220 e220 lift i.450 e.450. The geometry looks correct with the 7.234 push rods,
View attachment 1715624787
Well I measure each rocker and came up with an oal of 7.266 average, or a cup to ball length of 7.108.
Krazykuda, you mentioned using the nut locking style of adjusters. how much do the affect push rod length?
Oh ya it's all coming back to me now. I read about it somewhere (most likely here) where you also offset drill the rocker for a bigger adjuster and move the pushrod too.Wouldn't a ball and ball pushrod with a socket adjuster benefit pushrod angle here?