Roller rocker installation
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Senior User
Joined: Apr 2005
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From: Gillette, wy
Roller rocker installation
I have a 93 ford bronco/w 5.8L. I am trying to install roller rockers, but i am having some problems. I bought the guideplate installation kit from crane cams, which is supposed to be able to accept any 1.6 3/8 stud type rocker. I bought Proform roller rockers, which match this. I installed the guideplate kit on #5 cylinder, because it is the easiest to get to. I then went to install the rocker arm on the intake valve. Made sure the exhaust valve was open, so that i knew that the intake was closed all the way. When i put the rocker on the bottom of the rocker was touching the guideplate. There was also about a 1/8 inch gap between the roller tip and the valve stem. Is there something that i am missing, or do i just need to get longer pushrods? The installation instructions say that i do not need longer pushrods, so i thing that i am doing something wrong. Any help would greatly appreciated.
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Joined: Feb 2003
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From: Las Vegas
Originally Posted by gungho351
I have a 93 ford bronco/w 5.8L. I am trying to install roller rockers, but i am having some problems. I bought the guideplate installation kit from crane cams, which is supposed to be able to accept any 1.6 3/8 stud type rocker. I bought Proform roller rockers, which match this. I installed the guideplate kit on #5 cylinder, because it is the easiest to get to. I then went to install the rocker arm on the intake valve. Made sure the exhaust valve was open, so that i knew that the intake was closed all the way. When i put the rocker on the bottom of the rocker was touching the guideplate. There was also about a 1/8 inch gap between the roller tip and the valve stem. Is there something that i am missing, or do i just need to get longer pushrods? The installation instructions say that i do not need longer pushrods, so i thing that i am doing something wrong. Any help would greatly appreciated.
You've got me confused.
"I bought the guideplate installation kit from crane cams, which is supposed to be able to accept any 1.6 3/8 stud type rocker."
You don't have stud type rockers.
Your technique for making sure the valve is closed is not familiar to me either.
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Senior User
Joined: Apr 2005
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From: Gillette, wy
I am upgrading to stud type roller rockers. The stock type are pedistal mount(trying to get rid of some friction). I bought the guide plate conversion kit from crane cams, to install stud type roller rockers. The Proform roller rockers that i purchased are supposed to work
When doing a roller rocker installation, it is best to adjust one valve at a time. If the exaust valve is open, there is no question that the intake is closed. Therefore you adjust the intake valve, then turn the engine over by hand till the intake valve is open and adjust the exhaust valve.
When doing a roller rocker installation, it is best to adjust one valve at a time. If the exaust valve is open, there is no question that the intake is closed. Therefore you adjust the intake valve, then turn the engine over by hand till the intake valve is open and adjust the exhaust valve.
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Joined: Feb 2003
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From: Las Vegas
I've always just put the cylinder to be adjusted @ TDC on the firing side and adjusted both intake and exhaust at the same time. Your way seems a little long winded to me.
I'll have to research your conversion. Anytime I've converted to studs, I've had the pedestal's machined down and drilled and tapped to 7/16". I'm trying to picture your conversion. What do the 3/8" studs bolt to? The stock threads are 5/16".
I've also had good luck (as well as being cheaper) just using pedestal mount roller rockers. The Crane 1.7's are OEM Cobra rockers and are fine for a hipo street motor. The supplied shims will almost always have enough leeway to retain stock pushrods
I'll have to research your conversion. Anytime I've converted to studs, I've had the pedestal's machined down and drilled and tapped to 7/16". I'm trying to picture your conversion. What do the 3/8" studs bolt to? The stock threads are 5/16".
I've also had good luck (as well as being cheaper) just using pedestal mount roller rockers. The Crane 1.7's are OEM Cobra rockers and are fine for a hipo street motor. The supplied shims will almost always have enough leeway to retain stock pushrods
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Originally Posted by DOHCmarauder
I've always just put the cylinder to be adjusted @ TDC on the firing side and adjusted both intake and exhaust at the same time. Your way seems a little long winded to me.
I'll have to research your conversion. Anytime I've converted to studs, I've had the pedestal's machined down and drilled and tapped to 7/16". I'm trying to picture your conversion. What do the 3/8" studs bolt to? The stock threads are 5/16".
I've also had good luck (as well as being cheaper) just using pedestal mount roller rockers. The Crane 1.7's are OEM Cobra rockers and are fine for a hipo street motor. The supplied shims will almost always have enough leeway to retain stock pushrods
I'll have to research your conversion. Anytime I've converted to studs, I've had the pedestal's machined down and drilled and tapped to 7/16". I'm trying to picture your conversion. What do the 3/8" studs bolt to? The stock threads are 5/16".
I've also had good luck (as well as being cheaper) just using pedestal mount roller rockers. The Crane 1.7's are OEM Cobra rockers and are fine for a hipo street motor. The supplied shims will almost always have enough leeway to retain stock pushrods
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Joined: Feb 2003
Posts: 4,074
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From: Las Vegas
Thanks for pointing that out, that's freaking obvious!!!! I didn't get the 5/16-3/8 stud. The whole idea of a 3/8 or 7/16 stud is to decrease/eliminate deflection. By using a 5/16 thread you're not gaining anything.
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Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I used Crane's conversion kit on a 400M two years ago. Only reason there was it was too expensive to get the pedestal rockers for the Cleveland style heads or have the heads machined for 7/16" studs.They worked OK, but I had one, that no matter what, just would not stay put. It kept unscrewing from the head even with Loc-tite. If I had had the money, I would have gone with either of the other options there.
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