SoCal Jet Boats
Discussion => The No Wake Zone => Topic started by: 78hawaiin on June 18, 2013, 03:18:49 PM
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Just wanted to introduce myself. Ive been creeping around the site for the last few mounth trying to gain some knowledge. Bought my first boat last Sept. 78 Hawaiian Mini Day Cruiser, 454bbc, berkley jet etc. Has ran good until last week. Took it to Laughlin@Avi for a 6 day vacation. First day starter took a shit, fixed that (new sierra starter $204). Oh well its all part of the game. Next day flattend a cam lobe, done for the week. Still had a good time even without the boat. Know i am pulling the motor, going to rebuild the whole thing, from top to bottom. Motor is an older 70's 454 oval port, performer manifold, holley 650, comp roller rockers. Thats all i know untill i pull it apart. question is...looking at a comp cam (int 270/exh286) (int226/exh236@50) (lift.544/.547) (Ls112). Would this be a good mild cam? Also would like to go to 9-1 compression (pump gas). Really dont want to change carb (just rebuilt) or manifold (just plated). Looking to build the motor 420-450hp@500fpt. Just want a solid running motor. Any suggestion would be greatly appreciated. Will post some pics later.
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Going to rebuild or just refresh the motor?
Run a roller cam, duration depends on exhaust style- logs and snail or headers
650 holley will work, 750 or 850 would be better, along with a single plane.
Daniel
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Daniel, It has logs and snails. Just refresh i guess. New bearings, seals, pistons,rings, heads rebuilt etc.
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Some pics.
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I like your boat! I have a 76 Sleek Craft that looks to be from the same mold that I am restoring (slowly). If your biggest problem is a flat cam, you could feasibly pull the motor down, clean all the metal out that the bad cam left behind, then just do rings, bearings and a valve job. Your back on the water in a couple weekends. If you want 400-500 hp, I think you'll need to do a complete motor build with a good plan to start. A pump gas 450 hp motor is very doable, but you're going to need good parts for it to live ie; a decent set of heads that can flow a little, decent valve train with preferably a Hyd roller cam, decent pistons (not stock cast), a cast crank is fine as long as it's no smaller than 10-10 and I would Tufftride it for added peace of mind. A good balance job, and I would go at least 750 cfm on the carb. Get with a good machine shop that knows marine engines, this is probably the most important part of the build, even if you do your own assembly. A good machinist will help pick out the parts, piston size, cam, etc, that will match your motor so everything is working efficiently together. This is just my opinion, so take for what ever it's worth.
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Thanks for the input. Pulled it apart last night. Droped the pan and there was the oil pickup sitting in the bottom. Going to do some measureing tonight. As of now a couple broken rings, and one rod journal doesnt look the greatest, but should clean up. If anybody else has any suggestions? Thanks again
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Call me. Lets talk about your options. I went through this dilemma last year on a re-build.
HD
661-723-6880