MILD THUNDER

iTrader: (3)

Tahoe540

That is what I thought too 670 lbs of torque at 3700 is not to shabby. I know how this works in a car but how does this torque work down low with an outdrive? Will this benefit in getting the boat up on plane quick?

Crude Intentions

iTrader: (1)

Boat motor or tractor tailer? Lol

Tahoe540

I just picked it up and they used 1 3/4 primary tube headers on this so the exhaust was crap. He also told me to go down one jet size all the way around.

MILD THUNDER

iTrader: (3)

I've seen some AFR headed 540 combos here on oso, that didn't make that kind of low end torque , with smaller CC heads, and smaller cams.

Are those heads using the stock 2.19 intake valves?

MILD THUNDER

iTrader: (3)

Certainly. It should be a nice combo for a 30ft single engine boat. Some larger headers would have helped , esp in the upper rpm band. 1.75 is small for that build.

I think your cam guy did a good job. I'm sure most were thinking, that cam was way too big, and not enough split, but I think it could have used a bit more cam. Hence why I said it will make more TQ, than HP.

ICDEDPPL

iTrader: (1)

This should be Getherdones favorite build. But he`d use a smaller cam for even more TQ .

Tahoe540

They are 2.25 now. The cam was reground by this guy my machinist uses in socal. He has reground one of my solid drag race cams but I have not used it yet as the clay smith I had custom ground works so much better than the Erson I had in there. Good people over at Clay Smith.

I know everyone talks about HP numbers breaking outdrives but what does high torque down low do to them. I will state I am not planning on hole shots and abuse on the outdrive. I have already bought a spare one just in case.

getrdunn

iTrader: (7)

Well I was within 1 hp but off with rpm. I woulda though even advanced 2 deg it woulda peaked out higher. Nice build

getrdunn

iTrader: (7)

Hey now....

It is kinda funny though when your think of a tunnel ram 565 with 236/244 much smaller than 252/252 yet pulls peak hp at 6k. Port velocity??? Valve timing??? Wonder what OP's peak hp woulda been with some 315/325 worked over heads with 2.30 valves.

Btw I did end up with cams that even make yours look small. Lol