If he got the cams from Bob, typically he uses the 8.1 cores and the firing order is 1-8-7-2-6-5-4-3, at least they were on mine. Tim can verify this if the cam gear retaining bolts are metric threads.

yes thats firing order

Are you running water cross overs and are the back of your intakes plumbed to dump water out of them? This helps propagate flow through the back of the head. I seized valve #8 3 times within 15 seconds after getting on plane. My guides were checked and honed over and over and they still failed.

Rook, looks like this happened with #2, which should get excellent water flow being on the front of the engine.

the firing order had no bearing on this failure.tim,s new wires did not cross fire.maybe lightning struck the nearby water and caused the failure by overheating the water.

I am running the same setp I have had for 10 years with 3 different engines with zero issues.... I did not change what woked fine....

It could be as simple as a bad day at the afr plant, or lifter plant one of the 2 seem to be the cause because nothing else adds up...

I thought I was the only one that happened to. At first, I thought the burn marks on the bottom of my boat was from going to fast.

Oh my fault, I thought you rebuilt these engines with new aftermarket heads...
These are not the old engines out of the Scarab III?

Yes I did, so why did I not fuk up my chitty pro comps? Hmmmm