Kara25
Forum Mentor
Ok so i got an ongoing 550 to 673 project going on and tore down my 550. Besides a crumbling front camchain guide who will be replaced with a way better looking one from a 650G i also found out that my EX cam has 2 lobes below the service limit and one of my IN cam lobes has a scratch that my nail can catch... Originally i wanted to use the 550 cams bcs i like the high revving characteristics of the 550 cam profile but after those discoveries thankfully the 650G cams that came with the head are immaculate and well within specs so i am inclined to use those. So the questions are. 1. How in the name of GOD do you remove cam sprocket bolts???? I dont have a vice and as you can imagine is a nightmare! Those things are tight! Any tips or should i go to a mechanic with the cams so he can UN-bolt them and put the 550 sprocket on the 650 cams?? 2. The big question. The 550 sprockets (30) teeth will go into the 650G camshafts making the whole setup eventually a 550 sprocket setup but with 650G camshafts. With which mindset will be the motor timed?? Like a 550? Meaning counting 20 pins at TDC of 1-4 OR like a 650G meaning counting 19 pins at TDC of 1-4?? In general my question is what determines how a stock GS engine is timed? Its all about the 2 sprockets on top and the one in the crank or it tottaly depends on the camshafts themselves??? I dont want to mess with any cam degreeing etc as many others who did this swap did ,its way over my league just want if possible to put 550 sprockets into 650G cams and time the motor as a stocker without all the extra search for the few ellusive HP from cam degreeing. Thank you very much in advance!
