Curious...I used a 330hp rotating assembly, replaced the heads with a set of ported big ovals, installed a comp cams 11-236-4 cam, lifter and spring set. Used stock Mercruiser balancer, timing cover, and chain. Ignition is a gm hei unit with a lightly springed mech adv. No vac. adv.
When base timing is set at 16* and total timing is @ 36* the thing pops through the carb upon acceleration and runs real sluggish.
If the base is set up to 20* and total timing is 40* the thing idles gr8 and responds gr8.
I have read of others that have experienced this same issue with Comp Cams.
Is there possibly a quirk with the timing mark on the dampener being retarded? Or is the 330hp Mercruiser timing possibly intentionally retarded for the Mercruiser dizzy?
I did not degree the cam. Is there a possibility of the cam being ground specifically for the Comp-Cams timing chain? I also have read that Comp grinds their cams with advance built into them?
WTF is the deal here? Your thoughts?