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View Full Version : ? about pushrod length w/CM cam/heads/Scorpions



z90sc
11-02-2008, 01:24 AM
......anyone have a part# for 7.200" length pushrods....I replaced the stock rockers with 1.73 Scorpion RR's and the chevy 305 # 7808-16 rods that were recommended when using "search" are too short......much to much play between the rods and the rockers......would appreciate any help/suggestions.I used a pushrod checker and it came up 7.200.....
thanks,
z

CMac89
11-02-2008, 01:34 AM
Take your pick (5/16" diameter).

http://store.summitracing.com/egnsearch.asp?Ntt=7+200+pushrods&N=700+4294925232+4294924497+4294839873+115+4294869 097&Ntk=KeywordSearch

z90sc
11-02-2008, 01:38 AM
.......that was quick.......thanks..........
z

XR7 Dave
11-02-2008, 08:59 AM
You should probably check your length again. 7808's are 7.205" already. If you have "clearance" right now then you are going to need at least .050" more length, and maybe more. For best geometry I often use 7.300's and a .030" shim but that also depends somewhat on what your valve tip heights are.

frdlvr30
11-02-2008, 09:36 AM
You should probably check your length again. 7808's are 7.205" already. If you have "clearance" right now then you are going to need at least .050" more length, and maybe more. For best geometry I often use 7.300's and a .030" shim but that also depends somewhat on what your valve tip heights are.

Z, I have a set of brand new 7.200 if you'd like to try them...

z90sc
11-02-2008, 05:00 PM
You should probably check your length again. 7808's are 7.205" already. If you have "clearance" right now then you are going to need at least .050" more length, and maybe more. For best geometry I often use 7.300's and a .030" shim but that also depends somewhat on what your valve tip heights are.


.....frdlvr30 had a set of 7.300's and after install there's no compression in #1
cylinder...apparantly 7.3's are too long and a valve is hanging open...so where do we go from here?Gotta' give props to Keith [nickleman 60] and Dave[frdlvr30] for all their help and time trying to get this problem worked out.....
z

frdlvr30
11-02-2008, 05:37 PM
You should probably check your length again. 7808's are 7.205" already. If you have "clearance" right now then you are going to need at least .050" more length, and maybe more. For best geometry I often use 7.300's and a .030" shim but that also depends somewhat on what your valve tip heights are.

Perhaps we should look into shims? That would put us at 7.270...

Mike8675309
11-02-2008, 08:04 PM
They make an inexpensive tool you can use to find the ideal push rod length. It is basically an adjustable push rod. You then can find the length you need pretty easily.

mywhite89
11-02-2008, 08:54 PM
used a pushrod checker and it came up 7.200.....
thanks,
z

Maybe you should elaborate on exactly what you did to come up with this number. I had to go with 7.2" pushrods, the important thing is that you know how to measure for what length you need.

XR7 Dave
11-02-2008, 09:01 PM
Perhaps we should look into shims? That would put us at 7.270...Well, I think that's what I said now isn't it? :p

z90sc
11-02-2008, 09:17 PM
...I kinda' think that when I ordered the original rods,which were supposed to be 7.2's,that I was sent a mis-labeled set.......when I compared what I received with the stock pushrods they were the same length....this whole thing would never have happened if I had just done the side by side prior to install..........thanks for everyones' help and suggestions...
z

XR7 Dave
11-03-2008, 09:00 AM
...I kinda' think that when I ordered the original rods,which were supposed to be 7.2's,that I was sent a mis-labeled set.......

You didn't get those from me did you? :eek:

z90sc
11-03-2008, 12:10 PM
You didn't get those from me did you? :eek:

.....nah.....I ordered them onlne from some speedshop.....I'll try and find them locally then I can eyeball them..........
z

XR7 Dave
11-03-2008, 01:43 PM
7808's will have the number laser etched right on them.