1.7 rockers to 1.85 rockers do I need longer push rods?

 

No but you will need to upgrade the valve springs if you haven't already

 

Depends on the rockers. The Crane 1.8 rockers use a 7.250" pushrod. Suggest you verify rather than simply bolt in, but only after checking wipe pattern since correction of the wipe will also alter the pushrod length.

 

I figured he was talking about the SLP 1.85 rockers, since they are based on stock rockers...regardless though vettenuts is correct you should verify...use some machinist dye to checkout wipe pattern

 

You running a stock cam?

 

I actually wasn't sure either so laid out the steps that really should be verified. If he is using the SLP's then a valve spring upgrade should be done as well which the OP didn't mention.

 

I am running the Texas gaint cam, 317 heads with Precision Race Components .650" Double Springs and the stock rockers w/7.400 rush rods
I was looking at the SLP 1.85 rockers

 

Good luck controling those ramps with that high a ratio. I would reconsider...

 

Not a wise decision. Don't do it!!

 

Abort!!!!

 

Just on ratio alone the lift exceeds the 0.650" spring. I come up with 0.676" lift on exhaust and even if the valve train could be controlled and even if the springs would handle the lift, I doubt there would be any performance benefit or at least not enough to warrant the expense. And if you are running stock rockers, I would hazard a guess the rocker tip would go over the edge of the valve stem unless you really spend time setting the rocker height. Even then it may not be correctable.

 

I 2nd that!!

 

Those rockers would make your valve train unstable...it's one thing to try to run 1.85 with a mild cam, but on the "giant" you're asking for problems...that's the biggest cam Texas speed makes for Pete sake!

 

since we are on the subject about cam size with these 1.85 or is it 1.8 rockers. i had them on my ls1 with 224-224 cam, then transfered them on my 402 with cam 236-242 .650 lift total, now with 10000k on my dual gold springs i have to change the springs(lost 1000rpm). i have a set of brian tooley spings on the way, going to change them this winter. do you think the rockers are ok with my cam, would like to keep my rockers(adjustable,studs guide plates, push rods, nice kit) or else have to spend another grand to get the 1.7 crane rocker kit

 

Guys need to stop blindly applying gen 1 knowledge to gen 3s. Gen 3s come with a lot more rocker ratio than gen 1s did. It is possible to use rocker ratios 1.8 and higher but only if the system is well thought out by a true professional, and buying shelf lobes and blindly throwing ratio at them is not well thought out.

 

i would have not bought them to add to my present cam, the cam is healty enought for my engine, i like the ideal that this kit is able to adjust the valve train and did not want to lose the investement i had in to them. was wondering if the rockers are going to ruin my new springs or am i ok.

 

Then you should have talked to a professional and gotten a cam where the ramps were mild.