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Might pull the engine this winter and have it put on the dyno. Going to see what happens with the jetting and timing. It it helps it will only be a bonus when I get my new exhaust.

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Weather is going to be great here today. Just about 65 degrees. Going to see what happens with timing and jetting.

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Ran the boat. Timing helped a bit. The water was dead calm with current. Not good for going fast. Hit 60 AGAIN!!!!! Pulled plugs looked lean/ even with 83/90. Ran best with 83/85 with 36 deg total. In 1 footers I figure 64/65. Same as before. Taking the carb to Nickerson Performance in Bristol, Pa tomorrow. Talked to him about the issues and said he can make it better. We will see. Did a static chk on the cyl. All are between 170 and 180 psi. At least nothing is hurt there.

737jetmech

iTrader: (1)

You need to tune jetting with a air/fuel gauge ... thats the best way . Reading the plugs with the new fuels is tough. Your going to have to install a o2 bung before the water in your exhaust system. If you decide to dyno the engine give Tim Jepp a call @ 856-589-5658 ... he has tuned my last 6 engine builds and is local NJ . In my opinion your engine is down on power . My last n/a 496 made 606 hp @ 5700 ... 731 hyd roller installed @ 107 ... oval port 290 edelbrock heads ... rpm airgap intake . 9.6 to 1 compression and a custom 1030 cfm 4150 carb built and tuned by Tim . The key is in the tune and I have found dyno time to be well worth the money and time invested .

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Took the carb to Nickerson's today. Great guy! They request you bring a completed engine and boat spec sheet from their web site prior to going. Dean (owner) took time to talk with me about my issues with the boat. I took my spark plugs with me and that helped. My carb HAS ISSUES! Going to swap out my stamped rockers for rollers and put the carb back on next week. Hope to see an improvment.
Thanks Jetmech for the heads up on Tim Jepp. I'll call him.

wannabe

You need a new intake. The factory intake is all done at 500 hp power level. Look for a Mercury 500 style intake. Factory heads are hurting you too.

Wannabe

blue thunder

Ditto what JM said. That exhaust though will totally kill your scavenging which is necessary n/a and with rect port heads. Pretty much any aftermarket manifold would be an improvement with a full length header like an eickert getting you the real pop.

BT

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Pulling the engine this week to take it to be put on the dyno. I will be able to be there and work on my engine along side Dean Nickerson. This should be fun!!!!!!! Keep you guys posted......

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Carb is done. Picking it up tomorrow. Friday weather looks good. Going to go for a spin and see what the carb upgrade does. Watch me go slower..........

Pull the engine next week and dyno it, also going to install a set of 1.8 roller rockers

nonstop

The carb looks great! Milled off the air horn, adj air bleeds, port and polished, etc.....Ran the boat today and saw a nice improvement. Picked up 2.5 mph on gps and just about 200 rpm. I did have the 1 inch spacer on today. ( the spacer cost me mph with the old carb set up ) It now pulls all the way up to 5000 rpm. If I had a 23 pitch I would have tried it and gotten a bit more speed and rpm but all things considered ( my stock exhaust holding back a few more mph) it was a good way to end the season. I ran out of time to try running it with out the spacer. Who knows, maybe it still cost me mph.