jeff1000man

It is a good intake, but those are dual plane intakes. I prefer the single plane 454-0 for the increased velocity and thus better midrange torque and high rpm power.

I also recomend high quality oval port heads for NA engines under 502-509 CI. You wil see better torque numbers which is more important in a boat then HP.

THe 305 afr and the 308 iron eagle are small enough runner for good torque also.

I can get you great pricing on AFRs with all the upgrades and CNC'd chambers for under 3k a set, and they will have the proper springs for whatever cam you decide to use.

Good luck with your project.

Let me know if I can help.

ECeptor

[QUOTE=jeff1000man;2421200]It is a good intake, but those are dual plane intakes. I prefer the single plane 454-0 for the increased velocity and thus better midrange torque and high rpm power.

[QUOTE]

But for this guy's mild 330 upgrade, a dual plane would be better due to only 454ci and less than 5000rpm, right?

A 502 with AFR305's would be a good match for a single plane.

KAAMA

Yes, I would think in most cases a dual plane would be better for a 454cid engine that will only see 5000rpm or less---and that is especially true if you're running with the old Merc cast iron non-breathing exhaust manifold junk. I do not know much about the Merc 496 exhaust system, but I do know that a better breathing aftermarket exhaust system will bennefit your engine's power output especially in the midrange cruising speeds. Based on what I have experienced and have seen since the early 1980's that is just my .02

ThruHull

What kind of HP do you think this combination would produce?

jeff1000man

[QUOTE=ECeptor;2421319][QUOTE=jeff1000man;2421200]It is a good intake, but those are dual plane intakes. I prefer the single plane 454-0 for the increased velocity and thus better midrange torque and high rpm power.

I doubt you would even be able to measure the diference betwen the 2 manifolds on an enigne of this set up.

Until you get into bigger displacement, higher rpms, and bigger cams and hgihger quality heads most of those things are not factoring.

I always suggest you buy the parts for the engine that you intend to build, even if it doesn't work the best with your current set up, it will be close.

If you only intend to build a 454, 406 or 502, then buy the smaller stuff.

If you intend to go bigger or bring blowers or NOS into play, then plan for that now to save yourself some cash in the future.

454's 502's etc, IMO are engines that just don't make the power unless you throw money at them. If you are going to, or are planning on throwing money, than construct a plan or what you intend to do in the future.

Short blocks are available online and through suppliers for very reasonable prices and will make very reasonable power with the proper cam application and bone stock aftermarket heads.

If you intend to build a bgger bottom end in the future, then buy the top end that will work for that combination down the line.

In the case of the 330, ANY inprovement AT ALL is better than what they came with. If it is intended to get stroked to a 496 in the future then buy the good ovals and the single plane so you will get optimum power later down the road.

If your intent is to eventually stroke the 502 into a 540, then buy the small square port head and spend the money and order it from a supplier who can set it up for what you are going to do with it in the future. You will feel so much better in the future, when you are thinking back on your wise choices, instead of filling up the Swap Shop tryng to find the ONE guy who needs that junk you obviously realized to late, was a bad purchase. Or if you are the guy that is settling for less than optimum power in his big displacement mill because he is trying to make the stuff from his smaller engines work on his larger mill.

Good luck with your projects.