Need help w/Duntov and 30-30 cam data

[Duke W.]

Chevrolet learned a lot about cam design during the sixties once they figured out what was really happening at the valve at high revs. I've done considerable research in this area, but need lift-crank angle data for the '56 to '63 Duntov cam (3732097) and '64 to '65 (plus '67 to'69 302 Z-28) 30-30 cam (3849346). I have the data for the '70 and up LT-l. If anyone is looking for a Duntov or 30-30 there are "exact repros" available. The best time to take the data is on a stand during rebuild. All you need is one (preferably two) dial indicators, a good degree wheel, a couple of hours of your time, and it helps to have a helper to record data. If you have the data or are at a convenient point where you could take it, please e-mail me for more specifics. I think the story would make a good article for The Corvette Restorer. It would also demystify all the hype about cams and include some other vignettes like "the truth about rocker arm ratios".


Duke

[Terry M.]

Re: Need help w/Duntov and 30-30 cam data

Sounds like a great story to me. I hope you can get the data you need.


Terry

[Jeff Burkey]

Re: Need help w/Duntov and 30-30 cam data

Duke, I have just purchased from Performance Chevy a different cam for my '70 LT-1; it is commonly referred to as a DZ 140 (ending part #) or the 1st design off road cam for the high-revving small block. I would enjoy hearing your comments on this cam profile as it seems you are familiar with this type of Chevrolet engine and the duty for which it was designed... Jeff B.

[Clem Z.]

Re: Need help w/Duntov and 30-30 cam data

this cam requires springs#3927142 timing IO 50 btc IC 96 abc lift .471 EO 94 bbc EC 56 atc lift .488 this cam has very little bottom end. the specs are from CHEVY POWER MANUAL

[Duke W.]

Re: Need help w/Duntov and 30-30 cam data

Don't know which cam your talking about -- can't find it in my second through fourth edition of my Power Manual, but it sounds like an off road cam. I need a complete measured lift-crank angle data set (at least 25 data points with good data density near the end of the opening ramp and beginning of the closing ramp) Got a line on what I need for the 30-30. Anybody have the data for the Duntov? Thanks for your response.


Duke

[Clem Z.]

Re: Need help w/Duntov and 30-30 cam data

this cam part# is 3927140 it is listed in the 1st edition 1975 of the power manual.