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what autolite plug

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novajoeyg

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« on: October 04, 2014, 02:40:22 PM »
Hi new to this site I'm in the process of turbo charging my 1978 Hawaiian jet boat. It has a almost stock Harman marine 460 ,signal 76mm turbo, 750 CSU e85 blow thru carb, a1000 fuel pump and twin 38mm gates, question is what spark plug to run thinking around 10psi boost. I don't know if this matters but it has a Berkeley 12jc stainless a impeller. Any help would be appreciated


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novajoeyg

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« Reply #1 on: May 02, 2015, 10:58:32 AM »
Had the boat out the other day it accelerates so fast. Don't have mph yet but I'm spinning my "A" impeller to 6000rpm were it hits my rev limiter that's with 8psi of boost. Boat cruises nice still, installing boost controller this weekend try to limit boost at lower rpm. Hopefully boat makes through the season started building a new short block for next year so I can turn it more lol. Running very little timing and boost and boat still fast and fairly stable no ride plate or pump mods. Big improvement from last summer pulling 4200rpm


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