Originally Posted by Maritime_Eng (Post 4149280)

Why not just replace the 280's with 300xs's? :party-smiley-004:

Originally Posted by Maritime_Eng (Post 4149684)

I don't want to side track Rick's Thread here so I will make it short. Yes there are two ways to build a 15in 300xs.

1) Purchase Stock 300xs's with 20in Offshore mid. Purchase a Mad EFI 300x can, shorten drive shaft, and shift shaft and main swivel arm. Re-assemble.

2) If you have a 260 or 280 offshore you can remove the power head, switch adapter plate to a MAD EFI 2.5 to 300x adapter and bolt on 300xs powerhead. You will want to switch the gear ratio for the lower unit to 1.62 to 1. The only draw back of doing it this way is the water pump in the 2.5 gear case is smaller and the engine will start to over heat slightly if held wide open for long runs.

Originally Posted by 2 Trick Rick (Post 4149754)

This is not side tracking, its giving me more ideas.. I currently have offshore mids so this adapter plate idea is interesting.

Originally Posted by wannabe (Post 4149846)

Build yourself a pair of 454 LSX with LS7 heads- Bobmadera cam and you will never look back.