[1965coupe]

changing my 65 mustang 289 to a hyd roller. using comp cams link bar pro magnum lifters , wondering push rod length. i understand this may only be a starting point but i was using stock length pushrods before and had good geometry so what do length do i need??

thanks

 

[Just Jim]

I just put some Crane link bar hydro roller lifters and a standard base circle 5.0 cam in my Morris and used stock length (6.25)5.0 roller motor push rods.Not sure if the Comp lifters are the same though.

 

[71hotrodpinto]

Heres the horses mouth on pushrod length.

http://www.compcams.com/Technical/CurrentCatalog/HTML/306-307.asp

Some times you get lucky on mixing and matching heads, valves, rockers, and lifters etc. But if you dont pay attention you can have problems.
I have 68 302 heads, late modle 95 roller block,b303 cam, stock ford hyd lifters, and .100" longer extreem duty on piece valves.
I was lucky enough that stock ford length roller hardend pushrods worked like a charm. But I got lucky. I thought for sure i was going to have to get custom length.
good luck

 

[forthman]

I would measure. You really need the rockers to be hitting right. And i would not let luck be my guide when i mix and match. Easy way to see what you have is to use a black magic marker on top of valve stem then install rocker and roll motor by hand 2 rev's. then remove rocker. You will see the roller hit spot.

 

[71hotrodpinto]

Yes your right , I shouldnt let luck be the guide. I tried the ebay motorsports pushrods first and they worked. I was planning to get some custom length pushrods if they didnt work.
Id get the pushrod checker, its $20 for the pair EXH and INT from comp.
And at summit they have tons of in-stock different lengths in the "high energy" series of pushrods for reasonable prices.
Good luck

 

[1965coupe]

i know i don't need to let luck be the guide i was simply looking for a starting point with this new set up , i am gonna measure with a length checher but i wanted to know where to start.

 

[Just Jim]

I made my own length checker by cutting up an old push rod and tapping the I.D. to accept a 10-32 screw with the head cut off. The push rod Crane called out for my application was way too long at 6.68".The 6.25" length stock 5.0 turned out about perfect but all applications are different.