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Early prostock iron heads.

General engine tech -- Drag Racing to Circle Track

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Steve.k
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Re: Early prostock iron heads.

Post by Steve.k » Wed Jun 24, 2020 5:22 pm

That could be Stan. I would imagine most the cams ground then were close. I know Paul said they had a terrible time with valves breaking. They were using the factory ford valve to start. Its apparent by repair work on head. He said trw sent him ti valves to try. They switched to those and life was a lot better.

bob460
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Re: Early prostock iron heads.

Post by bob460 » Mon Jul 06, 2020 8:24 pm

Steve.k wrote:
Wed Jun 24, 2020 5:22 pm
That could be Stan. I would imagine most the cams ground then were close. I know Paul said they had a terrible time with valves breaking. They were using the factory ford valve to start. Its apparent by repair work on head. He said trw sent him ti valves to try. They switched to those and life was a lot better.
I thought you might like this Steve from Australia........click on pic and look at some cool old prostock parts pics that were for sale recently.


Steve.k
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Re: Early prostock iron heads.

Post by Steve.k » Mon Jul 06, 2020 9:31 pm

Wow very cool Bob460 thanks !!

Walter R. Malik
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Re: Early prostock iron heads.

Post by Walter R. Malik » Tue Jul 07, 2020 9:18 am

The heads I would like to see used or somewhat copied are the "Factory" Clevelands which used the criss-crossed pushrods. Just when they came out, the rules changed so, they never got much fanfare.
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Re: Early prostock iron heads.

Post by piston guy » Tue Jul 07, 2020 10:39 am

Randy,
I ran a criss cross pushrod engine originally built by Mark DeGroff of Valley Head service. Mark custom made "rocker guides" ( not plates) because of the unique nature of the "pinched" rockers. He also modified the block for the additional head bolts needed ( 9x7/16ths +5 1/2") Crower ground the cam and it wasn't "perfect". I found two other sets over the years and there is a "long block" on display in a museum in one of the Carolinas. The head was a collaberation between Smokey Yunick and Al Buckmaster. According to Smokey it was "the good port" from a BB Chevy fitted into a Cleveland head. The head was good for 2hp/ci in NA dorm. I sold it to a Pantera guy and lost track of it.

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Re: Early prostock iron heads.

Post by piston guy » Tue Jul 07, 2020 10:46 am

"In the day" GK( General Kinetics) had the field covered on cams with the "321D" profile and it's (IIRC) .472 lobe lift. Glidden didn't get along with Tewles (GK) so he went with Comp Cams to develop his own stuff.

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Re: Early prostock iron heads.

Post by Steve.k » Tue Jul 07, 2020 3:14 pm

I’ve seen the criss cross setup and it looked like severe angles in pics. Did they have trouble staying together?

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