This is the best footprint I can get. All the online pictures I find show a nice dainty line, but these self centering rockers seem to have a pretty large contact area. Anyways, the way Im looking, the footprint comes much closer to the top (oil valley side) and indicates I need longer pushrods. This was measured with stock rods. How much longer should I go?

http://img130.imageshack.us/img130/9049/sdc10122w.jpg

 

cmon, nobody has any input? Maybe I should post a thread about what muffler sounds best or how to add a body kit..........

 

You probably need longer push rods, but determining the proper size you need an actual measurement. Get an adjustable push rod, and when you get the proper pattern measure the lenght of the rod, and buy a set of that size. If the cam has different exhaust and intake lift, you will need two different sizes. Also much depends on type of lifter. This site may help.
http://www.compcams.com/Technical/Cu...PDF/106-07.PDF

 

Intake and exhaust is .462 and .469...Im assuming that .007 wont matter?

Im going to buy a pushrod length checker from summit either today or tomo, just figuring out some other stuff I need in order to justify shipping charges.

Arent stock pushrods 7.8? The guy who I got the heads from also gave me his pushrods but they appear to be the exact same length as stockers?? I thought vortecs took different length. Im PRAYING I only need .100 more in length, anything more than that gets EXPENSIVE! (like over 10 bucks a rod!!!)

 

are u using solid lifters in the motor?

 

Hydraulic, flat tappet.

 

u will need to use a solid lifter to figure out and get your rod length right. thats probly why your getting a screwy reading.

 

Stop me if Im wrong here, but this is the FIRST ive heard about using a solid lifter to check it. Ive read about 6 articles that outline the method, none of them involve using a solid lifter. Everything says find TDC, establish zero lash, rotate assembly and then read the ink on the valves. Ill probably be ordering the length checker from Summit tonight....do I need to order a solid lifter too?

This a comp cam, hydraulic flat tappet.....

One more thing to learn I guess.....

 

i have one i got from tpis if u pm me your address ill send it to ya if u will send it to them when your done. i dont think they sell one lifter at a time. just remembered its a roller lifter. crap. well i tried.

 

Because the operating length of the hydraulic lifter varies depending on condition, it needs to be at the middle of its travel when measuring the push rod. This is pretty hard to achieve when the engine is shut down and there is no oil pressure to hold the lifter in the proper position. A solid lifter does not have that problem, but it may not have the same height as its hydraulic counterpart.
It is very possible that your push rods may be the proper size once the lifter is pumped up to its operating position.