Discussion Starter · #1 ·
I know this issue has come up before but I am just checking to confirm, I do not want to screw anything up on this possible mod. I have a set of oem intake and exhaust cams in good condition from a stock na 7rib 1987 4age Largeport engine. I am doing a headgasket job on a 4age SMALLPORT engine installed in a 1987 Mk1. The Smallport is a stock NA motor running all Smallport electronics! I have heard that a nice upgrade on this engine is to switch out the SMALLPORT intake and exhaust cams and replace/install the 1987 4age LARGEPORT CAMS (more lift/duration) in their place. Is this a good idea, and if so, will I notice any overall improvement in performance on the Smallport? Can a percentage be attached to this performance gain (seat of the pants)...i.e. 10% overall improvement...15% overall performance gain...? Also, very important..... do the valve shim adjustment measurements per the BGB stay the same on the 4age Smallport when changing out to the Largeport Cams? Thks for any experience/insight into this issue.