KNN filter

[GroovyNautique]

would there be any benefit to putting on a KNN filter on my 1993 SN? the engine is a carbureted 5.8L.

[NautiqueJeff]

RE: KNN filter

I assume you mean K&N. Don't do it! In a marine environment, you absolutely need the flame arrestor.

[DanielC]

RE: KNN filter

I am 100% with Nautique Jeff on this one. You can remove the flame arrestor, and clean it, if it is dirty, and put it back on.

[core-rider]

RE: KNN filter

Yeah, the K&N is basically useless in a marine application. The flame arrestor is already going to out flow the K&N filter, it can be cleaned and reused, and you don't have to oil it. Boats don't run in the dirt and dust enviorments of autos. There is no need for the added filtration.

[GroovyNautique]

they do have marine filters with flame arrestors now..

http://www.knfilters.com/marine/flamearrester.htm

but if the airflow through the SN is good enough, then I won't go that route.

[GroovyNautique]

any other suggestions to bump horsepower?

[78LS2]

buy an '08

[TRBenj]

The K&N wont flow any more air than the standard flame arrestor. It looks nice, but is really a waste of money if youre looking for horsepower.

If youre looking to add power, you have lots of options. There are heads, intakes, cams, ignition systems, etc. all available for the marine 351w. There is a lot more info over on CCFan if youre inclined to search.

You can easily build a '90 that will outrun a new Excalibur-powered 196.

[ffmedic74]

If you want the cheapest horsepower, buy some aluminum heads or some aftermarket manifolds, or even better... put a 454 crank in it and make it a stroker motor similar to an indmar.

[TRBenj]

If you want the cheapest horsepower, buy some aluminum heads or some aftermarket manifolds, or even better... put a 454 crank in it and make it a stroker motor similar to an indmar.

Those are terrible recommendations.

Whether Al heads on a RWC motor is a good idea is debatable. There are good iron heads available that would be more durable and cheaper. By manifolds you must be referring to exhaust manifolds. Choices are limited and pricey for Fords, so the cost/hp is very high. Lastly, you wont fit a Big Block Chevy crank in a Small Block Ford. There are cranks available for the 351w that would boost displacement to 393, 408, 427, etc. but at that point youre looking at a full rebuild.

The best bang for the buck would be to add heads, cam, intake and ignition. You can add an easy 80hp over the stock 240hp with those upgrades, and spend less than $2k (misc parts and gaskets included) if you do the install yourself.

[darrel409]

"the engine is a carbed 5.8...."
5.8..I would assume he has a Pro Boss and already has GT40 Heads and cam.

[TRBenj]

"the engine is a carbed 5.8...."
5.8..I would assume he has a Pro Boss and already has GT40 Heads and cam.

Pro Boss engine was optional- 255hp was standard. If he's talking engine upgrades I wouldnt assume he has the GT40 heads.

Ive yet to see any proof that the ProBoss motors had different cams than the standard 351w.

[GroovyNautique]

long winter ahead coming up.. best place to start would be the ignition and go from there? this engine is a normal 351 is it not? I should be able to get these parts and recommends from any parts place or do I need something special?

[ffmedic74]

My bad, I now have a chevy motor.

[882001]

a prop change will have a noticable performance upgrade. other than that cam, heads and intake.