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And I think he has two cams. One for an automatic and one for a manual. The manual being a mechanical cam.

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That's kind of odd, considering the factory only used one particular hydraulic cam regardless of the trans type.

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And I think he has two cams. One for an automatic and one for a manual. The manual being a mechanical cam.

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That's kind of odd, considering the factory only used one particular hydraulic cam regardless of the trans type.

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And I think he has two cams. One for an automatic and one for a manual. The manual being a mechanical cam.

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That's kind of odd, considering the factory only used one particular hydraulic cam regardless of the trans type.

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Brad is right, that is not correct.

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Sorry if that was misinformation. I was just going by what moparts.com user (AZ-Nick) said. In the old moparts.com post I linked above, AZ-Nick said that he bought the 4-Speed cam from bob and that it is a solid cam. I don't exactly have a Bob K. camshaft catalog to reference that, so I took it at face value.

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I don't exactly have a Bob K. camshaft catalog to reference...

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Neither does Bob, from what I've determined. It's all in his head so the "secret recipe" can't be stolen.

The PSMCDR rules for their Certification process states the cam must be within 1% of factory .050 duration and have the correct factory cam lift per NHRA stock class rules.

Given those rules, any "legal" '68-71 383-440 HP 4/6BBL engine cam should measure...
Intake: 214 @ .050" +/- 1% = 212 / 216
Exhaust: 226 @ .050" +/- 1% = 224 / 228
Max Lift: .455"/.470" (NHRA "blueprinted" lift specs)
LSA: 115

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For factory stock, I think the only thing they will check is that you have acceptable vacuum at correct idle setting. I wonder if they they would do a tear down for class certification unless you are protested??

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I'd expect that unless you are trying to get the car Certified (it's voluntary), there's something of a "don't ask, don't tell" thing going on re: how "stock" some of those cars' cams are.

However, given the constraints outlined by the rules above, I could still spec out something using modern lobes that could be worth a few ponies over the OEM cam of yours we measured.

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Mine's definitely coming out! I take it you're not going to try a Mr. Sixpack's?

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More likely a Mr. Snackpacks!

OK, I'll let this thread get back on topic now...

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For factory stock, I think the only thing they will check is that you have acceptable vacuum at correct idle setting. I wonder if they they would do a tear down for class certification unless you are protested??

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I'd expect that unless you are trying to get the car Certified (it's voluntary), there's something of a "don't ask, don't tell" thing going on re: how "stock" some of those cars' cams are.

However, given the constraints outlined by the rules above, I could still spec out something using modern lobes that should be worth a few ponies over the OEM cam of yours we measured.

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I know it bugs you that Bob won't come up with the specs to his cam, but as far as the rules go:

http://www.geocities.com/psmcdr/rules.html

Lift and duration as well as adequate vacuum is the only thing tested. Several cars that have been Certified under the rules (voluntarily) run Bob's cam.

Is there something modern out there that has factory lift, duration and gets 16" plus vacuum? I don't know. What I DO know is that Bob has run a 12.09 and Jim has run an 11.97 using that cam and that is good enough for me.



Dave

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I know it bugs you that Bob won't come up with the specs to his cam...

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No, it really doesn't... because I know exactly what lobes he uses and could call up the same cam grinder right now and have them send me exactly the same thing as a custom grind for myself.

My point is - without going into any of the actual specs - his cam does not pass the Certification process as described above. If there are cars that run his cam that have passed it, then they weren't checking the cams very closely during the inspection.

BTW, don't anybody bother to PM me asking for the specs of Bob's cam. It's obvious it works well as proven by the number of folks who run it with extremely good results. If you want one, buy one from him... he's the one who figured it out.

I'm equally impressed by how smoothly his car idles with it... sounds like Gradma's 318 w/ "hot rod" mufflers!

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Is there something modern out there that has factory lift, duration and gets 16" plus vacuum?

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And I think he has two cams. One for an automatic and one for a manual. The manual being a mechanical cam.

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That's kind of odd, considering the factory only used one particular hydraulic cam regardless of the trans type.

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Brad is right, that is not correct.

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Sorry if that was misinformation. I was just going by what moparts.com user (AZ-Nick) said. In the old moparts.com post I linked above, AZ-Nick said that he bought the 4-Speed cam from bob and that it is a solid cam. I don't exactly have a Bob K. camshaft catalog to reference that, so I took it at face value.

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And that was a Good Face you got it from.....
Yes I did buy a 4sp Six Pack mechanical lifter cam from Bob and here is a Picture of the box that the cam is still in, I never opened it because I changed my plans and no one wanted to buy it when I tried to sell it.

You were right I did say it and here is the pic of the box......

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... Yes I did buy a 4sp Six Pack mechanical lifter cam from Bob and here is a Picture of the box that the cam is still in, I never opened it because I changed my plans and no one wanted to buy it when I tried to sell it.

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... Yes I did buy a 4sp Six Pack mechanical lifter cam from Bob and here is a Picture of the box that the cam is still in, I never opened it because I changed my plans and no one wanted to buy it when I tried to sell it.

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Yes, I recall that you advertised that particular cam that Bob K. spec'd out for you. Did he say it was effectively a solid equivalent of his hydraulic cam, i.e. intended for the same application? Or was there something different about how he expected it would used?

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