smbikes

Back to the start , got the rockers off craigslist and ran the part# off of them and thay are 1.7! and now the guy wont pick up his phone!

FLcracker9

I have the Crane conversion kit on my F150 with a 358ci engine with p-heads. It sees 5500rpm quite a bit (it's a mud truck). They've been on it for 4 years, and not one problem. I wouldn't use them if you plan to spin it over 6000, but under that, you'll be fine.

smbikes

What type of rockers do you use?

FLcracker9

I ended up with Crane Energizer Rockers. I bought a set of Scorpions, but ran into a clearance issue with the conversion (side clearance). My local speed shop let me return them for a set of the Energizers. They worked out fine.

smbikes

Do they fit under stock valve covers,? Did you have any problrms with the push rod length?

minnow81469

do u need a set of rockers i still have some from the e7te heads if got to have some

smbikes

Well I still got my stock gt40 rockers but I dont know if they will hold up to the new HD springs that are in the heads

FLcracker9

I can't help you with the valve cover question, I have aftermarket valve covers. Yes you still need to measure for correct pushrod length.

MonsterBilly

I know this is a old thread, However, I am running trick Flow heads with pedestal mount roller and once my car gets to 5500 rpms it craps out. my valves are floating.

It has been this way since I installed these heads. My cam lift is .538 any idea why this could be happening?

I dont see any wear and the rollers set right on the valves. I have one roller that is a little loose so i am going to re shim it. Other than that is this to be expected?

I was hoping to get it to 6200 where my limiter is set.

mjr46

lift means nothing.......it's all on what lobe profile is on the cam, the ramp rates and or how aggressive they are that determine what springs should be used and how much closed pressure and open pressure there should be......what is the powerband of the cam?? if you have not tested the current springs rate, open vs closed pressure and compared them to cam specs then you need to do such......and please don't say but tfs says springs are good to xxx lift, I junk the factory springs right away when they come on new aftermarket heads, cause they are mass produced weak crap