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Doctor Dodge
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PostPosted: Thu Dec 22, 2016 8:53 am 
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Location: Sonoma, Calif.
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There are some cam cores with a thicker shaft...
I got one from Oregon Cam Grinding for the Bonneville engine. Imagine the shaft being thick enough that it nearly comes to the base circle of the lobes. I was told by OCG that the smaller shaft was done for rod clearance, but it think that's a mistake. So if you want a really heavy, strong cam, buy the "170" cam.
I have also seen these "thick shaft" cams and agree that I tend to find them in the early engines... both 170s & 225s
I think Chrysler went to the smaller shaft design simply for cost savings / weight reduction.

These kinds of changes usually come from the supplier(s) who are constantly getting pushed for cost reductions.
Chrysler asks for cheaper parts as they ramp-up production and the supply base says OK... as long as you change xxx, in this case, that change was taking some cast iron out of the cam cores.
Just my 2 cents...
DD
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Old6rodder
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PostPosted: Thu Dec 22, 2016 9:27 am 
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Location: SoCal
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Quote:
Quote:
There are some cam cores with a thicker shaft...
I got one from Oregon Cam Grinding for the Bonneville engine. Imagine the shaft being thick enough that it nearly comes to the base circle of the lobes. I was told by OCG that the smaller shaft was done for rod clearance, but it think that's a mistake. So if you want a really heavy, strong cam, buy the "170" cam.
I have also seen these "thick shaft" cams and agree that I tend to find them in the early engines... both 170s & 225s
I think Chrysler went to the smaller shaft design simply for cost savings / weight reduction.

These kinds of changes usually come from the supplier(s) who are constantly getting pushed for cost reductions.
Chrysler asks for cheaper parts as they ramp-up production and the supply base says OK... as long as you change xxx, in this case, that change was taking some cast iron out of the cam cores.
Just my 2 cents...
DD
Though limited to 225s, this's my observation as well.

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SlantSixDan
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PostPosted: Thu Dec 22, 2016 9:29 am 
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That makes a lot more sense. Thanks, all.

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