I think both builds the blower is above the rpm range that is ideal, but I also knew going into the build with doing what we were doing was going to push the blower regardless. My goal was to be as close to 5psi as possible, and my original thought was I wasn't going to use the smaller pulley but for dyno comparison. However with my stock pulley making 3.5psi it pushed me in the direction of the smaller pulley. My target was 650hp on 5psi, which we overshot really. If I wanted to I could take my stock pulley and have it cut down to 3.125" and probably make 4.5psi, but I may not go through the effort, unless we see a reason to, and I would probably try and find another stock pulley to do that too. These are also pleasure boats, the blower will see 99% of its time way under max rpm.

You missed the part where he re-used his old bottom end and couldn't use the rectangle series to get the combustion chamber small enough to get the compression up in the motor. You are also harping on a build that has a used bottom end (how used is the question?). Even if both motors went on the same dyno with the same headers on the same day with the same guy running the dyno you still have one fresh motor and one not so fresh motor. At that point the argument becomes a complete waist of time. With a new finish on the cylinders and fresh set of rings I'm sure the results would not have been the same.

You keep saying I know best and I don't take advice lol. I don't know best, and I do take advice, just cause I am not jumping on board with your advice doesn't mean i don't take advice.

And see I look at this different then you, as you keep going back to this 305 vs 265 competition bs. It's not a competition, but you know what s great data, that the smallest and cheapest head AFR makes, this tiny peanut port head, out of the box made almost 700hp on a cruiser motor with a small huffer. That's great information to a lot of people. I don't care what the 305 made, and I don't see where I left a lot of power on the table. Also like has been stated before the 305 was never an option for me as the combustion chamber was too large to a achieve the target compression, but that fact has and was skimmed over by you so you could continue on down this path that you are staying on. I think both builds are great builds and made surprising power.


Can you post your source for the max rpm information of 15,000rpm? And if that's true then we fall under that, and I know of people spinning them higher then I will be with success.

My timing and blower speed is alarming lol? Mike ran 36 degrees of timing on his build at just under 13000rpms on the blower, why would my timing be alarming over his? You think the amount of heat I'm generating spinning the blower 1700 more rpms with 2 degrees less timing makes it alarming over mikes setup? What is driving you to this conclusion?

Bottom end has 150-200hrs, and it was looked through to gauge condition. Nothing was seen to indicate any issues, bearings and all appeared to be in good shape. Trust me my builder would have liked to rebuild the bottom if he saw something that made it necessary to him.

I see now we`re bringing the bottom end into this discussion. ok
Instead of coming up with excuses I`d like to see one shred of evidence that the 305 head is " too big" .
There was a 100 page thread that is was but the fast is it isn`t. *please see dyno sheets*
That`s proof, not excuses about bottom ends or dyno headers etc etc

Just for fun how much HP and torque did your engines make MT?

I was pretty impressed when I seen and heard your boat run in person!

How am I making excuses lol, and for what reason would I need to make an excuse? You are just grasping at everything here. I never brought up my bottom end, I amswered a kind of question by Black Baja. I also never said the 265 would make more power, I actualy said in the other thread I thiught the 305 would probably make more, which it did, but it was a lot closer then I thought it would be. What should be taken away from this is that a 454, 461, or 468 can make great power with a 265 AFR head.

If you have two identical motors. One reminds you of a steam locomotive (out of the valve cover breathers) that's obviously worn out to the point you have to clean the Bildge every weekend. And the other looks like a normal motor (nothing out of the breathers). Which motor makes more horsepower?

Thanks buddy.

804hp @ 6200 rpm , 736ft lbs peak torque. 6.5lbs of boost.

A 454 with a supercharger making 675hp, is like a 540 with a supercharger making 799hp at 1.48hp per ci.

Today 900-1000hp all day with a hot blown 540 marine engine.