470 Questions

[jaysea]

My 470 2 Barrel Carb 170hp Is Running Fine With No Problems,,,,,,,,i Have To Pull The Engine To Replace The Oil Pan ,,,,,,,,its Poris An Leaking For Years So This Is The Year,,,,,,,,so I Just Bought A Boat With A Complete 470 190 Hp For Spare Parts ,i Stripped It Of All The Drive Parts ,an Was Wondering If I Should Make Mine A 190 Hp By Changing The Intake An 4 Barrel Carb ,whats The Best Opinion Better Speed An Proformence ,or Leave It Alone ,thanks Jay

[randlemanboater]

470 questions, thats a lot of questions.


Seriously, Spareparts or FERM will be along soon,they will have your answer.

[spareparts]

the 4bbl stuff is holy grail kind of finds. long block is identical, same cam, pistons, everything. If you use the 4bbl, make sure to include the oil cooler with it( they put it on those motors for a reason). I like the q-jets, the biggest problem I find is the throttle shafts wear out(they make a kit to fix them, but you better know your carbs). you should get better idle, acceration, and fuel economy(if you stay out of the secondarys) with the 4bbl over the 2bbl, especially if you have the merc carb, When you get it all back together, install a pertronix ignition(replaces the points), set the timing no higher than 5 degress btdc and ride. I allmost forgot, does your present engine have the 3" or 4" heat exchanger, if it has the 3", look for a 4" to replace it(hope your spare does)

[spareparts]

a couple of other things you need to know, you may have to change the valve cover for the 4 bbl so the throttle cable will have the pivot point to attach to, you will probably need a longer cable also as the 4 bbl cable route comes around the back of the motor and cross the engine from the port side. Before you get to far inot it, have someone check the 4bbl carb out for you, if its junk theres no reason to go any futhur unless you want to spend the money on having the carb rebuilt or replaced

[C YENSEN]

I am no Mechanic like spareparts is......but I have a 470 and have never had any problems with it. Mine also leaks oil like a siv. But I personally would change the oil pan and leave everything else alone. You go and put a 4 barrel on an old motor that is used to less power and your gonna blow somethin. Just my 2 cents.

[randlemanboater]

Originally Posted by C YENSEN

your gonna blow somethin.

Naw, its just icecream.