Where can I find the specs for the fuelie cams that were in the 365/375 HP 327's? Does anyone know if these are being re-produced. Thanks----Charles Newman
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Re: Duntov 30/30 camshaft
Search the archives, the question has come up several times before. Plus, sources like Crane with their Classic Grind line duplicate this camshaft among others popular with muscle cars... -
Re: Duntov 30/30 camshaft
There is no such thing as a "Duntov 30/30 camshaft". There IS a "Duntov camshaft" and a "30-30 camshaft" - completely different camshafts.
Like Jack said, an archive search should reveal and encylcopedia's worth of information on these and all other Corvette camshafts.
DukeComment
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Re: Duntov 30/30 camshaft
Charles----
As others have mentioned, this camshaft has been discussed here on numerous occasions and there should be plenty of info in the archives---likely way more than you're looking for. The original GM part number for the cam was GM #3849346. Like Duke mentioned, this is NOT the camshaft referred to in the vernacular as the "Duntov cam" (however, I'm sure that Duntov had a lot to do with its design and development).
Want one? No problem. Order GM #12364052. This is a Crane-manufactured reproduction camshaft kit which includes camshaft + lifters. It is an exact duplicate of the original. It GM lists for $171 and can be purchased for about $135.
I just love it when I see these nuts on eBay paying $1,000 for an NOS example of the 3849346. Then, they pay another $500-1,000 for a set of lifters. Put the above kit in your engine and NO ONE will ever know the difference. It will perform exactly like original and it'll be as durable as the original. Period.In Appreciation of John HinckleyComment
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Re: Duntov 30/30 camshaft
Duke, What you said has caused me problems for an eon. I used to think that the Duntov cam was just a 3736097 cam used on 63 down FI's, etc. Then X number of years ago all your heard and still do is Duntov 30-30 cam. SO the car owner goes out looking for a Duntov 30-30 cam and then ends up with the wrong cam because of slang talk.
If you don't mind me mentioning a brand name Speed Pro has a nice 30-30 replacment cam CS118R by FM. Not to be confused with the CS113R which is the '097 cam. You are slipping Duke. When I saw your name I expected your were going to suggest your favorite cam. The LT-1??? Happy Easter, JohnComment
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Re: Duntov 30/30 camshaft
255 duration at 050 ,485 lift, crane has a copy but dont expect it to run the same as the original.JRComment
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30-30 camshaft
"but dont expect it to run the same as the original"
What is your basis for this statement?
DukeComment
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Re: 30-30 camshaft
Thanks guys. I guess I have been in the dark too long. When I was a teenage hotrodder, Everyone that I knew said they had a Duntov 30 30 Cam. I purchased a '65 327/365 HP engine, am in the planning stages of re-building it. The lash is 30/30, so I guess that's the #3849346. I looked into the archives a little last night, & there seems to be a lot of opinions on how the replacements performed as usual,lol.Comment
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Re: 30-30 camshaft
I have considered going this route before and talking with the cam tech department they will tell you that the basic lift and duration numbers are the same but that is all that is blueprinted are the lift and duration and as you know Duke there is a lot more to a cam design than just the two numbers lft and dur ,this is the basis of my statement ,I think you know alot more about cams than i do so if i am wrong i am sorry and dont want to mislead anyone buying a blueprinted cam, im just trying to help. JimJRComment
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Re: 30-30 camshaft
It depends on the vendor, and most of them I don't trust, either.
However, I believe that both the Federal Mogul Speed Pro and Crane reproductions of the OE camshafts are based on the original drawings and their finished camshafts meet the original drawing specs within called out tolerances including Parkerized lobes, but Federal Mogul and Crane are the ONLY TWO VENDORS I trust to grind accurate reproductions of the OE cams - Federal Mogul because they are a Tier 1 vendor for OE parts and their aftermarket replacement brands are essentially the same parts and Crane because they supply the GMPP vintage camshafts and camshaft kits.
DukeComment
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And even then...
expect to get a defective grind unit from time to time...Comment
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Re: And even then...
Jack-----
That's been known to happen with GM-manufactured cams, too.In Appreciation of John HinckleyComment
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Re: Duntov 30/30 camshaft
Jim-----
I am 100% certain that the Crane-manufactured reproduction of the GM #3849346 camshaft is as close, or closer, to the COMPLETE, ORIGINAL GM specifications for that camshaft as those pieces originally manufactured by GM. If someone in a camshaft manufacturer's technical department told you otherwise, then I think I can say with certainty that person didn't know what they were talking about. I've found LOTS of BAD and INACCURATE information provided by the "technical folks" one gets to talk with when calling in for assistance with automotive suppliers or manufacturers. In fact, I've pretty much given up on calling because who you get are what I will call "first level" technical advisors----they know very little and it's a total waste of my time to even bother with them. Unless you can get to a much "higher up" person with REAL technical knowledge, forget it! And, usually, you can't get to such a person.In Appreciation of John HinckleyComment
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my cam story
i was replacing a cam in a drag engine with the same part # cam from the same cam company. i degreed the intake lobe and when he ran the engine at the strip it bent all the exhaust valves and damaged the pistons. it turns out that all the exhaust lobes were ground 10 degrees out of spec.i never checked the exhaust for clearance as it was the same part # because i had done that when i built the engine.these 14:1 C/R engines have things pretty close to get the C/R up there. the cam company agreed that it was their error and they would pay for the damage and send me a new cam. the cam came but no check,i finally had to go to "crane" when i was in fla to collect the $2500 they owed me. after that i always checked the cams for valve to piston clearance on both intake and exhaust even if it was a direct replacementComment
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