just took the valve covers off i thought i had zz4 350 crate the wierd thing is it has 1.6 ratio roller rockers with the botie stamp i know the zz4 didnt come with these there are 2 casting numbers one is 2175 the other is 10088113 can any one help with this ?
what head is it
chubba
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just took the valve covers off i thought i had zz4 350 crate the wierd thing is it has 1.6 ratio roller rockers with the botie stamp i know the zz4 didnt come with these there are 2 casting numbers one is 2175 the other is 10088113 can any one help with this ?
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2,739 Posts
The 113 is in fact the heads used on the ZZ4. The other, I don't recognize.
If it's a ZZ4, the cam that came in it was the ZZ4 cam...
http://www.sdpc2000.com/product/10185071/ChevyZZ4208221Duration0050HydraulicRollerCamshaft.aspx
Of course, that's no proof of what's in it now.
People can put most any kind of rockers on most anything. Those sound like they might be the Crane Gold narrow-body ones that GM re-sells. But no doubt, one of the reasons GM chose to private-label those particular ones, is that they FIT, unlike just about any other kind. They fit down between the bolt tunnel things, which most other roller trunnions don't.
No there is no particular requirement for taller valve covers for higher ratio rockers; although, the poly-locks tend to be too tall for most stock-height ones. Most, but not all.
As far as figuring out what cam is in it, you can check the lift at the push rod end of an intake nad an exhaust rocker, and use a degree wheel to determine the timing of the various valve events. Or, take off the timing cover and sprocket, and see if there's any markings on it.
If it's a ZZ4, the cam that came in it was the ZZ4 cam...
http://www.sdpc2000.com/product/10185071/ChevyZZ4208221Duration0050HydraulicRollerCamshaft.aspx
Of course, that's no proof of what's in it now.
People can put most any kind of rockers on most anything. Those sound like they might be the Crane Gold narrow-body ones that GM re-sells. But no doubt, one of the reasons GM chose to private-label those particular ones, is that they FIT, unlike just about any other kind. They fit down between the bolt tunnel things, which most other roller trunnions don't.
No there is no particular requirement for taller valve covers for higher ratio rockers; although, the poly-locks tend to be too tall for most stock-height ones. Most, but not all.
As far as figuring out what cam is in it, you can check the lift at the push rod end of an intake nad an exhaust rocker, and use a degree wheel to determine the timing of the various valve events. Or, take off the timing cover and sprocket, and see if there's any markings on it.
G
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