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Re: 318/392 Stroker Motors

Posted: Mon Aug 12, 2019 7:12 pm
by Trowerpower
Well, i have bad news, the port motor has blown another head gasket between cylinder one and three. This is the third one. She will run up to 4,000rpm and then backs off to 3200rpm. No water in the oil thank you Lord. Will probably pull the motor, check for worpped heads and block and try it one more time. Starboard engine still running like a watch.

Re: 318/392 Stroker Motors

Posted: Mon Aug 12, 2019 10:44 pm
by jralbert
Do you have overheating, freq cause of blown gaskets, going on?

Re: 318/392 Stroker Motors

Posted: Tue Aug 13, 2019 7:24 am
by Fastjeff
Groan!

In my case, when Mr. Port blew its head gasket, the block was"'fire slotted" (to quote the machine shop) and needed the block milled to eliminate it.

Hope that's not the case here.

Jeff

Re: 318/392 Stroker Motors

Posted: Tue Aug 13, 2019 8:02 pm
by Trowerpower
I do not believe the overheating caused the blown head gasket. I believe its the result of a blown head gasket. It started at 160 then fluctuated between 160 and 200. Yea it went to 220 but only momentarily. It runs/starts well, only under wot does it start stumbling. Only further disassembly will tell the story after Labor Day.. Bummer. I think a head is warped or block deck is the culprit. The stroker kit has nothing to do with it as cylinder pressures are not above 160. No hot spots on the block or exhaust manifolds.

Re: 318/392 Stroker Motors

Posted: Wed Aug 14, 2019 8:25 pm
by Trowerpower
Engine builder will disassemble, diagnose and repair after boating season is over. Taking the entire motor to him.

Re: 318/392 Stroker Motors

Posted: Fri Aug 16, 2019 7:10 am
by Fastjeff
With those ARP bolts, you can safely add another 10 ft-lbs. to the torque requirements. Be sure the threads in the block and nice and clean, and use lots of oil.

Jeff

PS: Good luck on this, my favorite Marinette power source!