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Can anyone help me identify an old big block cam #1610120 04/20/14 11:51 PM 04/20/14 11:51 PM
Joined: Feb 2012 Posts: 394 Ohio M moparjoe360.4 OP enthusiast
moparjoe360.4 OP enthusiast M Joined: Feb 2012 Posts: 394 Ohio	My dad removed a cam from his 383 this weekend thinking it was an old Crane but it's not. The cam came out of a 426 wedge in the late 70s or early 80s and he was told it was a"lumpy Crane" the only markings on it are RPD 21, and J 20 50. Ive tried googling the # with no luck. Any help would be great.

Re: Can anyone help me identify an old big block cam [Re: moparjoe360.4] #1610121 04/21/14 01:03 AM 04/21/14 01:03 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Doesn't matter. NO cam from the '70s or '80s is as good as a modern grind, if you are looking for max power. R.

Re: Can anyone help me identify an old big block cam [Re: dogdays] #1610122 04/21/14 01:06 AM 04/21/14 01:06 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: Doesn't matter. NO cam from the '70s or '80s is as good as a modern grind, if you are looking for max power. R. Unless its a MP 509 or MP 590.

Re: Can anyone help me identify an old big block cam [Re: moparjoe360.4] #1610123 04/21/14 12:11 PM 04/21/14 12:11 PM
Joined: Mar 2005 Posts: 2,489 Pacifica, CA Devilbrad top fuel
Devilbrad top fuel Joined: Mar 2005 Posts: 2,489 Pacifica, CA	Quote: My dad removed a cam from his 383 this weekend thinking it was an old Crane but it's not. The cam came out of a 426 wedge in the late 70s or early 80s and he was told it was a"lumpy Crane" the only markings on it are RPD 21, and J 20 50. Ive tried googling the # with no luck. Any help would be great. If you are close to Dayton, give Kammer & Kammer a call. They have a cam profiling machine and don't charge very much to run the cam in it to get you the full specs.

Re: Can anyone help me identify an old big block cam [Re: Devilbrad] #1610124 04/21/14 07:52 PM 04/21/14 07:52 PM
Joined: Feb 2012 Posts: 394 Ohio M moparjoe360.4 OP enthusiast
moparjoe360.4 OP enthusiast M Joined: Feb 2012 Posts: 394 Ohio	The reason he pulled it in the first place was to swap it for a Crane hvm 272-2-nc. We're trying to figure out what it is because it dosent even seem to have as much lift as the Crane he's replacing it with and we thought the old one was much bigger than the new one.

Re: Can anyone help me identify an old big block cam [Re: moparjoe360.4] #1610125 04/21/14 08:15 PM 04/21/14 08:15 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	You can measure the approximate lift yourself if you have some Calipers. Measure the base circle, then measure the max tip of the lobe and base. Subtract the base number from the max dimension and multiply it by 1.5 to get your approximate lift. With a known lift on those older cams you can approximate the duration. Example, 480 lift/ about 238/240 @ .050 520 lift around 250 @ .050

Re: Can anyone help me identify an old big block cam [Re: Sport440] #1610126 04/21/14 09:06 PM 04/21/14 09:06 PM
Joined: Feb 2012 Posts: 394 Ohio M moparjoe360.4 OP enthusiast
moparjoe360.4 OP enthusiast M Joined: Feb 2012 Posts: 394 Ohio	Thank you!! That should help a bunch!

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