Bobert

I picked up a set of new, 1.7 crane roller rockers ( the ones that came on the 93 cobra ) for $125 a while back.

My plan to build some gt40 has died, so rather then selling these, can i use these rr's on my stock E7's? With the Stock pistons, will they clear?

Also, would i need new springs?

Bobert

and yea i know, the E7s are only good to use as a boat anchor.

But just as a quick addition for one or two seasons of fun.

uedlose

yes they will work.

Bobert

Ok great. So they'll clear the pistons fine ect?

What about the springs?

uedlose

Yes they should clear BUT I would check clearance just like should be done all engines when doing anything to increase lift or duration or change valve events even though lift is not the only factor in piston to valve clearance issues. I dont know about the springs you will need to check for coil bind also. You should also to make sure the push rods are the right length.

Bobert

Yea how do i make sure i have the proper size push rods. This is something i ahve wondered for a while.

Does the push rod start at a standard size?

Like do i just move up a size to like 8.150 ?

uedlose

I would always start with what you got and go from there.

Bobert

yea i did some reading last night,

push rod length is quiet some work!

and the size i stated earlier is for a 351w haha.

thanks

jthorn9

Sounds like you have your answer but they will work with no piston clearance issues on a stock cam. You will have to watch your springs however because the added strain of the 1.7s may cause them to bind cause of their age.

Bobert

Ok great, thanks for the added response.

I talked to my dad today and he said to go for it. I have lots to look forward to when i retuen home now.

Going to add those rr's, some new push rods, new springs.

I also have a 70mm maff and 65mm tb i need to put on.

breathe 5.0 breeaattthh!! haha