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Old 04-01-2011, 04:31 PM   #1 (permalink)
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Default Roller rockers for 70 351C 4V

Looking for a solution to roller rockers for a 351C. Installed is a Comp Cams 292H cam.
Wanted comp cams 1411-16 roller rockers so ordered 4503-16 rocker studs. They have a 7/16" base thread and my heads have 5/16" base thread. Comp Cams says they don't have a rocker stud for my heads nor do they have a roller rocker that will work.
Seems odd to me. Anybody have a good solution for roller rockers on these heads? Stock 1970 351C 4V heads. I have a set of 1973 CJ heads and they have the same base thread.
Thanks
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Old 04-01-2011, 04:45 PM   #2 (permalink)
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351C engines had to different style rockers. Adjustable and bolt down pedestal non adjustable. You have the pedestal mount style. You have to take the heads off and have a machine shop mill the pedestals down. Then you can use the 7/16 studs and rockers.
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Old 04-01-2011, 04:56 PM   #3 (permalink)
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Quote:
Originally Posted by dfayette View Post
Looking for a solution to roller rockers for a 351C. Installed is a Comp Cams 292H cam.
Wanted comp cams 1411-16 roller rockers so ordered 4503-16 rocker studs. They have a 7/16" base thread and my heads have 5/16" base thread. Comp Cams says they don't have a rocker stud for my heads nor do they have a roller rocker that will work.
Seems odd to me. Anybody have a good solution for roller rockers on these heads? Stock 1970 351C 4V heads. I have a set of 1973 CJ heads and they have the same base thread.
Thanks
Crane makes a kit to convert to adjustable rocker arm. It is not for high spring pressure applications. There are also pedestal mount roller rockers available but they are pricey.

http://www.cranecams.com/311-325.pdf

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Old 04-01-2011, 05:00 PM   #4 (permalink)
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i would recomend having the rocker bosses milled and tapped for screw in studs and guide plates. then get a set of 1.73:1 rockers for 7/16" stud. also need hardened pushrods for the giude plates.
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Old 04-01-2011, 05:07 PM   #5 (permalink)
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Thanks, that all sounds like what I'm looking for.
So do they mill the pedestals down to the current thread level - just taking the two pedestal tabs off? And then drill and tap to the 7/16" thread?

Thanks again
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Old 04-01-2011, 06:43 PM   #6 (permalink)
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Greetings,

Be very careful when purchasing roller rockers for your Cleveland head engine. I don't know if it's still the situation today, but most roller rockers supplied in the past were actually for a Big Block Chevy. Fairly close ratio, but geometry is wrong. The push rod seat or cup is usually at the wrong angle for a Cleveland, and the roller tip is not optimized either. The Yella Terras mentioned above make a Cleveland correct rocker arm, but even they use the same rocker for BBC in their budget series. Do your research carefully.

Don
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Old 04-01-2011, 07:20 PM   #7 (permalink)
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Quote:
Originally Posted by dfayette View Post
Thanks, that all sounds like what I'm looking for.
So do they mill the pedestals down to the current thread level - just taking the two pedestal tabs off? And then drill and tap to the 7/16" thread?

Thanks again

They'll mill that pedestal almost all the way off. Then they'll drill and tap for 7/16" thread. Don't mess around with trying to do something using the stock 5/16" bolts. Unless you're running stock valve springs, you'll snap those bolts off. Ask me how I know.

This is what you're heads will look like after being milled,

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1970 Fastback (to be finished outside as a Boss 302 clone)
393 Windsor AFR 205 heads with 11.5:1 compression
Tremec TKO 5 Speed
Link to my Hub Garage and blog about my car http://www.hubgarage.com/mygarage/maxum96





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Old 04-02-2011, 07:42 AM   #8 (permalink)
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Quote:
Originally Posted by PrecisionTrans View Post
Greetings,

Be very careful when purchasing roller rockers for your Cleveland head engine. I don't know if it's still the situation today, but most roller rockers supplied in the past were actually for a Big Block Chevy. Fairly close ratio, but geometry is wrong. The push rod seat or cup is usually at the wrong angle for a Cleveland, and the roller tip is not optimized either. The Yella Terras mentioned above make a Cleveland correct rocker arm, but even they use the same rocker for BBC in their budget series. Do your research carefully.

Don
Good point

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