Hello,
Just finishing up a repower project on my 23' Powerplay. I replaced an older Mark IV 330 Horse 454 with a new 450 Hs/502 longblock. Among the things I changed were intake (used Merlins) and went with Edelbrocks marine carb'. The item I need help with is the Mercruiser ignition, is it ok to use the setup off the 454? The 454 box has 32 degrees total advance compared to the 502's 28 degrees, not sure how much different the curve is or if it matters. Also does the Thunderbolt ignition have a built in rev limiter. Appreciate anyone's input who has been there before, my mechanic isn't as worried as my wallet is.. don't want to melt a motor yet.
Thanks in advance,
Rich