Camshaft??

MEXJOE · 01-18-2012, 04:12 PM

I think it's time to upgrade the cam in my 325 hp 396.
Any suggestions as far as brand and who is best for this combo.
Thanks
Glen DeMenge

Alan Roehrich · 01-18-2012, 05:08 PM

I get mine from Tim Cole at Comp Cams.

Bobby Lundholm · 01-18-2012, 08:34 PM

Bullet Cams

Jim Hanig · 01-18-2012, 08:58 PM

50 MM Comp Jim Hanig

Tom Moock · 01-19-2012, 12:28 AM

Jim Hanig, are roller cam bearings legal in stock? Tom

Alan Roehrich · 01-19-2012, 12:31 AM

You don't need roller cam bearings. I wouldn't run a 50MM cam in a big block.

Note, I've edited this post for clarity:

I meant to come back and clarify this, as I answered it "on the fly" or "off the cuff".

Stock core diameter is adequate for most applications. Comp calls that a 1.948" core, and does not give a "MM" dimension, however some research and conversion to metric dimensions yields 49.47MM as the dimension for a stock diameter babbit bearing 1.948" core.

A 50MM (actually 49.98) core is actually 1.968", which most cam companies list as a "stock diameter" for use with roller bearings. That is where the confusion here comes from. From what I've seen, the industry standard for core sizes refers to the actual stock diameter big block Chevy core as 1.948", and the "stock core diameter for roller cam bearings" as 1.968, or 50MM.

I'm actually surprised one of my friends didn't send me an email or a private message and bust my chops on it.

I certainly should have been more clear, and more careful. I hope this resolves any confusion here.

Jim Hanig · 01-19-2012, 10:13 AM

Quote:

Originally Posted by Tom Moock

Jim Hanig, are roller cam bearings legal in stock? Tom

Tom they are not babbit only. Jim Hanig

01-18-2012, 04:12 PM	#1
MEXJOE Senior Member Join Date: Jun 2008 Location: nhranumbers.com Posts: 875 Likes: 137 Liked 165 Times in 51 Posts	Camshaft?? I think it's time to upgrade the cam in my 325 hp 396. Any suggestions as far as brand and who is best for this combo. Thanks Glen DeMenge

01-18-2012, 05:08 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,098 Likes: 1,546 Liked 1,777 Times in 404 Posts	Re: Camshaft?? I get mine from Tim Cole at Comp Cams. __________________ Alan Roehrich 212A G/S

01-18-2012, 08:34 PM	#3
Bobby Lundholm Member Join Date: Dec 2006 Location: Charlevoix, MI Posts: 450 Likes: 110 Liked 118 Times in 46 Posts	Re: Camshaft?? Bullet Cams __________________ Bobby Lundholm 3516 G/SA

01-18-2012, 08:58 PM	#4
Jim Hanig Senior Member Join Date: Aug 2006 Location: Pukwana SD Posts: 860 Likes: 554 Liked 99 Times in 49 Posts	Re: Camshaft?? 50 MM Comp Jim Hanig

01-19-2012, 12:28 AM	#5
Tom Moock Senior Member Join Date: May 2004 Posts: 801 Likes: 1 Liked 10 Times in 6 Posts	Re: Camshaft?? Jim Hanig, are roller cam bearings legal in stock? Tom __________________ Tom Moock 5704 STK

01-19-2012, 12:31 AM	#6
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,098 Likes: 1,546 Liked 1,777 Times in 404 Posts	Re: Camshaft?? You don't need roller cam bearings. I wouldn't run a 50MM cam in a big block. Note, I've edited this post for clarity: I meant to come back and clarify this, as I answered it "on the fly" or "off the cuff". Stock core diameter is adequate for most applications. Comp calls that a 1.948" core, and does not give a "MM" dimension, however some research and conversion to metric dimensions yields 49.47MM as the dimension for a stock diameter babbit bearing 1.948" core. A 50MM (actually 49.98) core is actually 1.968", which most cam companies list as a "stock diameter" for use with roller bearings. That is where the confusion here comes from. From what I've seen, the industry standard for core sizes refers to the actual stock diameter big block Chevy core as 1.948", and the "stock core diameter for roller cam bearings" as 1.968, or 50MM. I'm actually surprised one of my friends didn't send me an email or a private message and bust my chops on it. I certainly should have been more clear, and more careful. I hope this resolves any confusion here. __________________ Alan Roehrich 212A G/S Last edited by Alan Roehrich; 01-20-2012 at 12:39 PM. Reason: to clarify some statements