097 Camshaft Specs.

[Bill B.]

Can anyone direct me or provide me with original specifications for the Duntov 097 solid lifter camshaft #3736097 (Soup to Nuts). I see that there are several cam grinders that have their own version, but In need of the original factory specs including the .050 numbers, and LSA so I can compare for referencing.

I appreciate it, Bill


1961 Black/Silver/Red Int. 283/315 FI
power windows. Frame off 65% completed.
1989 White/hard top/Grey Int. daily driver 167,000 miles

"The problem with Liberalism is that eventually you run out of other people's money"
Margaret Thatcher

[Duke W.]

Re: 097 Camshaft Specs.

I/E .050" lifter rise duration is approximately 228/231 degs. The POML's are 108.5/112.5, which allows you to compute the LSA. This is a test! You do the arithmetic.

Gross lobe lift is .26250/.26650". Some specs multiply actual lobe lift by 1.5.

Beyond the above I can tell you that the Duntov lobes are symmetrical, and other the having .004" taller clearance ramps the lobes above the tops of the clearance ramps are the same at any point. In other words, if you measure the lobe at any angle between the POML and the tops of the clearance ramps the exhaust lobe is .004" higher than the inlet lobe.

Since the Duntov is a mechanical lifter cam, part of the .050" lifter rise is clearance ramp - .008/012", so if you want to compare the Duntov to a hydraulic lifter cam you have to measure durations at .058/.062", and the resulting 220/220 duration means that a 220/220 duration hydraulic lifter cam with similar lift would be pretty close to the Duntov.

If you want a true to original Chevrolet blueprint copy, the Federal Mogul Speed Pro CS113R is a no-brainer, and you can order it at any NAPA store.

Maybe some other grinder has a "Duntov" a little cheaper, but even if it shares the same high level specs as listed above you have no way of knowing for sure if it's true to print unless you have it analyzed by a Cam Doctor machine and verify the lobe indexing on the engine.

If you are looking for an exact replica of OE camshafts, Federal Mogul is riskless. You may find someone who claims they offer the same thing a little cheaper, but it's more expensive to find out for sure than just paying for the correct part at NAPA.

Duke

[Bill B.]

Re: 097 Camshaft Specs.

Duke - That's exactly what I needed, Thanks! I thought Cam Doctor was no longer available! Do you know their rates and turnover times? Do you have any contact information?

I appreciate it, Bill



1961 Black/Silver/Red Int. 283/315 FI
power windows. Frame off 65% completed.
1989 White/hard top/Grey Int. daily driver 167,000 miles

"The problem with Liberalism is that eventually you run out of other people's money" - Margaret Thatcher

[Duke W.]

Re: 097 Camshaft Specs.

There are Cam Doctor machines around. Google Audi Technology, the manufacturer. I know Jerry Stahl has one in PA.

Duke