Dodge72
Odd one out
Happy New Year everybody! New year, same project. ;)
I'm closing in on buttoning up my 360 build, but pushrods remain the thing the purchase and install. I have a LA roller block 360, with older non-roller 360 heads. I have a near stock reground cam (203/204 dur., .447 lift), with non adjustable factory stamped steel rockers. This is simply a cruiser engine that I may get up on occasionally for spirited driving and to pass people on the highway. I had tried to research in measuring hydraulic, non adjustable rocker arms and you need to get the length right in order to have correct preload. Can you tell me if I did this correctly?
I installed my adjustable pushrod in shorter than normal to install the rocker shaft. The lifter was placed on the base circle of the cam. Rocker shaft installed, I began to lengthen the pushrod, going and going until there was no more up and down movement and made sure that it wasn't pushing down on the lifter plunger. Once this was achieved, I determined that this is the length at "0 preload"; I could be wrong on that. I removed the rocker shaft and measured the pushrod.
Length at "0 preload": 6.6875". These are measured from ball end tip to ball end tip.
Then, reading more, I hear that hydraulic roller cams like preload on the lifters, anywhere from .030"-.060" of preload. I picked .050" in the middle and added that to the length of my pushrod.
Total length of pushrod with .050" preload: 6.6925".
Let me know what I need to change so I can remeasure.
My next question is holes or no holes? When I first got the engine (it is a 92, no it is not a Magnum), it did have the oil through pushrod holes. I have stock replacement Melling hydraulic rollers with oil through holes. I've seen some back and fourth on the subject. When I primed the engine I didn't see a whole bunch of oil but I saw evidence of oil being bled through under where the rocker oiling hole is. I may try to prime it again just to be 100% sure but is it detrimental to have it either way?
Sorry for the essay, I think I covered everything though. Once this is determined this is the last thing to buy!...Well, until something unforeseen happens lol. Thank you!
I'm closing in on buttoning up my 360 build, but pushrods remain the thing the purchase and install. I have a LA roller block 360, with older non-roller 360 heads. I have a near stock reground cam (203/204 dur., .447 lift), with non adjustable factory stamped steel rockers. This is simply a cruiser engine that I may get up on occasionally for spirited driving and to pass people on the highway. I had tried to research in measuring hydraulic, non adjustable rocker arms and you need to get the length right in order to have correct preload. Can you tell me if I did this correctly?
I installed my adjustable pushrod in shorter than normal to install the rocker shaft. The lifter was placed on the base circle of the cam. Rocker shaft installed, I began to lengthen the pushrod, going and going until there was no more up and down movement and made sure that it wasn't pushing down on the lifter plunger. Once this was achieved, I determined that this is the length at "0 preload"; I could be wrong on that. I removed the rocker shaft and measured the pushrod.
Length at "0 preload": 6.6875". These are measured from ball end tip to ball end tip.
Then, reading more, I hear that hydraulic roller cams like preload on the lifters, anywhere from .030"-.060" of preload. I picked .050" in the middle and added that to the length of my pushrod.
Total length of pushrod with .050" preload: 6.6925".
Let me know what I need to change so I can remeasure.
My next question is holes or no holes? When I first got the engine (it is a 92, no it is not a Magnum), it did have the oil through pushrod holes. I have stock replacement Melling hydraulic rollers with oil through holes. I've seen some back and fourth on the subject. When I primed the engine I didn't see a whole bunch of oil but I saw evidence of oil being bled through under where the rocker oiling hole is. I may try to prime it again just to be 100% sure but is it detrimental to have it either way?
Sorry for the essay, I think I covered everything though. Once this is determined this is the last thing to buy!...Well, until something unforeseen happens lol. Thank you!
