pushrod setup with comp XE-R lobes
11-02-2006, 07:28 PM
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pushrod setup with comp XE-R lobes I just got the valve train assembled and started checking my pushrod lengths. I am running a comp 232/236 cam with int. base circle of 1.457 and exh. base circle of 1.445. My heads have been milled .020 and I am running a .040 cometic. I have Jesel shaft mount rockers and after market valves. I am also using the new LS7 race lifters.
After assembling everything, I quickly found out that it was a good thing that I got an adjustable pushrod checker. The after market valves and Jesel's through a curve ball at me. according to the base circle figures I should have lost .0495 on the intake and .0555 on the exhaust. with the milling and thinner gasket, I should have made .035 of it back up therefore keeping some preload(assuming .050 preload to start) This wasn't the case. With the stock pushrods I don't even touch the bottom of the rockers. There is .012 play on intake and .006 on exh. I guess the valve train is skewing the numbers.
Anyway, after checking. I come up with 7.397 on the int to get to 0 lash and 7.391 on the exh. Adding .060 for preload I get 7.457 int and 7.451 exh. These are overall length measurements. Whose pushrods are measured in OAL instead of Guage length. I want to find the best match for length to get the recomended preload.
Mike
After assembling everything, I quickly found out that it was a good thing that I got an adjustable pushrod checker. The after market valves and Jesel's through a curve ball at me. according to the base circle figures I should have lost .0495 on the intake and .0555 on the exhaust. with the milling and thinner gasket, I should have made .035 of it back up therefore keeping some preload(assuming .050 preload to start) This wasn't the case. With the stock pushrods I don't even touch the bottom of the rockers. There is .012 play on intake and .006 on exh. I guess the valve train is skewing the numbers.
Anyway, after checking. I come up with 7.397 on the int to get to 0 lash and 7.391 on the exh. Adding .060 for preload I get 7.457 int and 7.451 exh. These are overall length measurements. Whose pushrods are measured in OAL instead of Guage length. I want to find the best match for length to get the recomended preload.
Mike
