[painted jester]

Originally Posted by Mr. P-Body

This is good...

At a press conference in 1956, when Zora Arkus Duntov was answering questions about the new "283 horse 283", the question about the cam came up. His response was "It's about 3/4 of the way to a "full race" cam." IIRC, he was speaking of the venerable "Duntov 30-30". It "stuck".

We "heard" the term a lot, but as non-Chevy people, we never paid much attention to it. "We" had McKellar cams... (McKellar #10 was the "real deal" 421SD cam) I too, haven't heard the term used in MANY years.

Jim

Thats good P-body

I have an old book here from 1950 that mentions reground 3/4 cams for sale in one of the ads for a flat head Ford but there are no specs! Im looking through my old pocket hot rod mags looking for an article on the 3/4! LOL if I find one I'll post it

[BigEd36]

Until Crane Cams closed up before the restructuring a couple years ago, these cams were listed as 3/4 race cams on their website.

Part #10017 Grind #274 HO6 274/274, 218/218, 106
#10008 282 HO6 282/282, 226/226, 106
#10018 286 HO6 286/286, 230/230, 106
#10011 302 HO6 302/302, 246/246, 106

CraneCams from the Internet Archive Wayback Machine

[1Gary]

Well...................back in the day we did things real crude............................so the way we measured cams........................was with a tape measure...........................and 3/4 was...............................

LOL-LOL-LOL

[Mr. P-Body]

1950?? Wow. That might indicate somebody like Chet Herbert or Racer Brown came up with it... My first professor (Red Lund) ran a Herbert roller in his T/F '32 roadster in the early days ('54, '55) with the 239 L-head Ford. I once had a Racer Brown solid roller for a 421. Chet ground the cam (nice guy, BTW), Brown supplied the lifters. They had "skirts" on each side to keep them "straight" on the lobe, circa 1960... Funny stuff today.

Jim

[vht]

Back in grade school I remember a couple of brothers, older than me, they would bring a J C Whitney book on the bus and it had 3/4, and Full race cams listed in their book. One brother had a old 55 chevy and I can't remember what the other one had at the time.