How much will a reconditioned V8 cost

[Edd]

I have an 18ft Classic, British built Speedboat with a 3L 140hp 4 stroke inboard. This is not doing the boat justice and I am desperate to get a bigger engine for it. Does anyone know 1) how much I could potentially get selling my existing engine and 2) how much would a reconditioned 220hp V6 or 260hp V8 cost roughly?

[CPC]

I have an 18ft Classic, British built Speedboat with a 3L 140hp 4 stroke inboard. This is not doing the boat justice and I am desperate to get a bigger engine for it. Does anyone know 1) how much I could potentially get selling my existing engine and 2) how much would a reconditioned 220hp V6 or 260hp V8 cost roughly?
Yes for your 3L being used I'd say you wouldn't get but a few hundred dollars for it and for a reconditioned NON-marinized V-8 you'd be looking at roughly 1200-1600$ not including taxes or shipping.

[TheFisher]

You will definitely need to use a marine camshaft, brass knockout plugs, etc. You just can't use a non marine engine without modifications.

[CPC]

You will definitely need to use a marine camshaft, brass knockout plugs, etc. You just can't use a non marine engine without modifications.
You are missing the point here. I understand you HAVE to marinize the engine. What I am saying is the NON marinized V-8 reconditioned will be ruffly 12-1700$. You can marinize it yourself.

[TheFisher]

Sorry CPC, I was just trying to make the original poster, Edd, aware of some of the common mistakes people sometimes make in an engine swap.

[dgrason]

You will definitely need to use a marine camshaft....

I'm new to this stuff so please help clue me in. Why does the camshaft need to be specifically for marine use?

[gonzo]

This subject has come up several times. There is much more than the camshaft that need to be changed.
*Pistons need to be heavy duty
*Piston rings need more gap than automotive
*Valves have to be SS
*intake manifold has bronze inserts in the water passages
*rod and main bearings are of a harder alloy than automotive
*oil pump is high volume
*crankshaft is steel not cast iron
*block and heads have nickel to make them corrosion resistant
*electrics are marine-spark protected
*balancer is differernt
*flywheel is different
*carburator has to be marinized or the fuel injected system be completely changed to a marine type
There are more things, but this should be enough to show you that it is way cheaper to buy a marine engine. If you can't get a 4.3 locally I have several used and rebuilt. I don't know what the freight is but can check. Look in my website for more info.