Re: big base circle cam in stock elem.
 

Trust me, they definately do check for it. And pulling the cam out is apparently necessary to measure it. Not much fun, and hard on the tennis elbow when your balancer is as tight as mine is. Fortunately I had a stock size cam bore but I had intended to go with a 55mm but just didn't get it done in time.

I have an email indicating the large core cam is ok as long as you aren't using roller cam bearings. I will try to find it and post it if I can.

Tracy

Re: big base circle cam in stock elem.
 

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.

Re: big base circle cam in stock elem.
 

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

Re: big base circle cam in stock elem.
 

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

Re: big base circle cam in stock elem.
 

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

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.

Re: big base circle cam in stock elem.
 

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

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

Re: big base circle cam in stock elem.
 

The issue here isn't the larger cam bearing, it's the larger base circle LOBE that the larger bearing register allows you to fit in.

Re: big base circle cam in stock elem.
 

Exactly!! Great post.