"I have a 1972 Classic Glastro
"I have a 1972 Classic Glastron speed boat with a rebuilt 350 small block powering a 12JCB Berkeley jet. Over the years I have rebuilt the boat and this year added a new (re-built) quadrajet marine carb, and a new MSD marine distributor. I finally had the boat in the water and it ran fairly good up to half throttle. Beyond half throttle, the boat hesitated terribly up to full throttle where the motor evened out but just sounded poor. I set up the MSD advance with the lightest springs to full advance at about 2200 RPM but did not change the bushings. The old distributor was an HEI (vehicle) distributor and was in poor shape. What I want to know is will the timing cause this hesitation? How important is the timing and to what setting should I be looking for. I have not completely timed the motor yet, but am going to set it to 34 deg BTC at 2200RPM or full advance. Is 34deg enough? Do I also need to look at the carb and where should I start since the carb is a rebuilt marine quadrajet? Any advice would be great. Thanks"
"I have a 1972 Classic Glastron speed boat with a rebuilt 350 small block powering a 12JCB Berkeley jet. Over the years I have rebuilt the boat and this year added a new (re-built) quadrajet marine carb, and a new MSD marine distributor. I finally had the boat in the water and it ran fairly good up to half throttle. Beyond half throttle, the boat hesitated terribly up to full throttle where the motor evened out but just sounded poor. I set up the MSD advance with the lightest springs to full advance at about 2200 RPM but did not change the bushings. The old distributor was an HEI (vehicle) distributor and was in poor shape. What I want to know is will the timing cause this hesitation? How important is the timing and to what setting should I be looking for. I have not completely timed the motor yet, but am going to set it to 34 deg BTC at 2200RPM or full advance. Is 34deg enough? Do I also need to look at the carb and where should I start since the carb is a rebuilt marine quadrajet? Any advice would be great. Thanks"