do i need to run a drive with reverse rotation
 

I am building a 30 ft scarab with 2 454 motors trying to find out if i need a reverse rotation drive. If i do can i have a drive that is standard rotation reversed, also if i put on team g intakes with holley carbs will this screw up the way a otherwise stock motor runs or should i run stock intakes and carbs

please help thanks

If your going to run bravo's, you set one up to spin in reverse, and the same for volvo's, but anything else is a special drive.
as far as intake and carbs, what are you after, there are a lot of aftermarket parts out there that are better than the stock 454 setup, especially if they are the 7.4L 330hp merc's with (updraft) intakes.

im running alphas
 

cant afford bravos have to run alphas what do you mean special drive
? you mean the drive has to be a reverse from the factory

yes, they make a counterrotating alpha drive, all you need is the lower though, but they ran drives turning the same direction for years, it does affect the performance to some degree, but in your application it should be fine, but you need to careful with the amount of hp you put to the drives, they don't like much over 300hp, and throttle up easy.

If you want l/h rotation with an alpha,
you need a counter rotation lower unit.

ok so i can run standard rotating motors and standerd drives and it will be ok

with your application it will be fine.

With both Alphas turning right-hand props boat might tend to heel to the left from torque. Boat will dock better with counter-rotators. An investment in a left-hand Alpha lower could make it a much better boat.

MR cozzie
 

so you say i should run one left rotating lower does it matter what side i install it on

Also any one ever hear of a alpha drive being built to bravo specs if so what does that mean and how can i tell what gears or in a drive. i think i will need to match gear ratio i believe if im wrong please let me know thank you all i realy appreciate the help

Install counter-rotating lower on port side. Turn props out for best results.

Yes, both drive ratios must be the same. Probably 1.50:1 will give you good prop selection.