big base circle cam in stock elem.

03-12-2014, 06:25 PM

Quote:

Originally Posted by Bobby Lundholm

Until it's in writing it's only hearsay not a rule.

That's the truth. Could change or be enforced area to area. If you spin a cam bearing and have to repair a block, that means your out?

SSDiv6 · 03-12-2014, 06:48 PM

Quote:

Originally Posted by Todd Hoven

That's the truth. Could change or be enforced area to area. If you spin a cam bearing and have to repair a block, that means your out?

Now that is funny! There is a difference between repairing a block and machining the camshaft tunnel to use a bigger diameter cam.

03-12-2014, 11:17 PM

I've never done it, but pontiac has problems with cam bearings. If you spin one and do excessive damage to the journal how would you repair it? They don't make an oversize cam bearing for my deal. I think the 50mm would be logical for a repair.

Quote:

Originally Posted by SSDiv6

Now that is funny! There is a difference between repairing a block and machining the camshaft tunnel to use a bigger diameter cam.

Paul Precht · 03-12-2014, 11:33 PM

Quote:

Originally Posted by Todd Hoven

I've never done it, but pontiac has problems with cam bearings. If you spin one and do excessive damage to the journal how would you repair it? They don't make an oversize cam bearing for my deal. I think the 50mm would be logical for a repair.

A decent machinist could make a sleeve and the machining process would be similar to sleeving a cylinder.

SHANE R · 03-12-2014, 11:37 PM

Quote:

Originally Posted by Paul Precht

A decent machinist could make a sleeve and the machining process would be similar to sleeving a cylinder.

NEXT THING YOU KNOW, FUEL INJECTION WILL BE ILLEGAL ON 69 CAMARO'S ?????????

SStockDart · 03-13-2014, 12:05 AM

Quote:

Originally Posted by Paul Precht

A decent machinist could make a sleeve and the machining process would be similar to sleeving a cylinder.

Paul, you are assuming that you use a standard cam bearing and not a roller bearing, right? I believe that is the issue.

Paul Precht · 03-13-2014, 12:37 AM

Quote:

Originally Posted by SStockDart

Paul, you are assuming that you use a standard cam bearing and not a roller bearing, right? I believe that is the issue.

Just talkin about a repair for a stock Pontiac block with standard cam bearings, that's what I thought Todd was referring to.

SStockDart · 03-13-2014, 01:50 AM

I guess I don't really understand the issue here....What is the advantage to a large bearing cam shaft, as opposed to a standard bearing...????? I understand how a roller bearing camshaft bearing might make a half a horsepower.....plus add to the longevity of the engine. but a standard cam bearing versus a larger one??????? then why do Mopar guys use smaller rod bearings (chevy)...??? I'm just saying

TILBURG · 03-13-2014, 12:06 AM

The first post was about "BIG BASE CIRCLE" cams. When someone has a minute could you please forward me a spread sheet w/ what the stock base circles are for everything amc,ford,chry.chevy,hudson (you never know) What if you have big power adder like a 4/7 swap cam? And it ends up being the same as a ford would something like that be considered as crossbreeding?How do you tell the car (driver) in say B stock auto that just got his 440,396,427 etc A#S drug down the track by a 2014 302 you have to go home because your base circle is to big.

03-13-2014, 06:36 AM

Exactly!! Great post.

Quote:

Originally Posted by TILBURG

The first post was about "BIG BASE CIRCLE" cams. When someone has a minute could you please forward me a spread sheet w/ what the stock base circles are for everything amc,ford,chry.chevy,hudson (you never know) What if you have big power adder like a 4/7 swap cam? And it ends up being the same as a ford would something like that be considered as crossbreeding?How do you tell the car (driver) in say B stock auto that just got his 440,396,427 etc A#S drug down the track by a 2014 302 you have to go home because your base circle is to big.

03-13-2014, 01:50 AM	#8
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,178 Likes: 880 Liked 574 Times in 212 Posts	Re: big base circle cam in stock elem. I guess I don't really understand the issue here....What is the advantage to a large bearing cam shaft, as opposed to a standard bearing...????? I understand how a roller bearing camshaft bearing might make a half a horsepower.....plus add to the longevity of the engine. but a standard cam bearing versus a larger one??????? then why do Mopar guys use smaller rod bearings (chevy)...??? I'm just saying __________________ Gary Hansen - SS/FA 4911, B/SA 4911

03-13-2014, 12:06 AM	#9
TILBURG Junior Member Join Date: Oct 2010 Posts: 44 Likes: 4 Liked 79 Times in 7 Posts	Re: big base circle cam in stock elem. The first post was about "BIG BASE CIRCLE" cams. When someone has a minute could you please forward me a spread sheet w/ what the stock base circles are for everything amc,ford,chry.chevy,hudson (you never know) What if you have big power adder like a 4/7 swap cam? And it ends up being the same as a ford would something like that be considered as crossbreeding?How do you tell the car (driver) in say B stock auto that just got his 440,396,427 etc A#S drug down the track by a 2014 302 you have to go home because your base circle is to big.