What is the difference between A cam and B cam?

**crumple** · 07-15-2013 11:18 AM

And how does one determine which they have??

**Charles.waite** · 07-15-2013 11:20 AM

The A cam is a softer material than the B cam. There is a production date cutoff when they started using Rev B cams. I think it was sometime in 2007 or possibly as early as late-2006 (based on production date, not necessarily model year).

**crumple** · 07-15-2013 11:33 AM

Originally Posted by Charles.waite

The A cam is a softer material than the B cam. There is a production date cutoff when they started using Rev B cams. I think it was sometime in 2007 or possibly as early as late-2006 (based on production date, not necessarily model year).

Ok i figured it was something relating to that. Anyway you can tell by your vin or any serial #?

**mec** · 07-15-2013 11:36 AM

Originally Posted by crumple

Ok i figured it was something relating to that. Anyway you can tell by your vin or any serial #?

If you remove the vacuum pump cover the a revision is one piece, the b revision is two piece. You can see it on the rear face of the cam

**Charles.waite** · 07-15-2013 11:46 AM

Originally Posted by crumple

Ok i figured it was something relating to that. Anyway you can tell by your vin or any serial #?

You should be able to tell by VIN, but I'm not sure anyone has any hard info on what vinscorrespond to the B cams.

Not that it matters as the HPFP will still destroy the B cams. It'll just take a few hundred miles more...