I'm building new big blocks for a 42 OL and want to be in 1100hp range. They'll be carbed with 10-71 blowers. What would you guys build a 572 or 557ci tall decks? It currently has 900s 542ci. Always running them 5k rpm plus and was thinking a shorter stroke would be better for longevity? It will be dry sumped, hyd cam, shaft rockers, dart heads. I know there's a lot of experience on this forum and would like get a few opinions. Thanks in advance!

Bigger is Always Better....................

Think you're gonna need bigger blowers if you want to make that power at reasonable boost levels.

I know Valako has a couple of 540/871 or 1071 builds that are conservatively over 1k hp over on the Lake Huron side of lake MI. Not sure if their on OSO or not but if so I'm sure they'll chime in. Jim V said it took many by surprise.

If you do go 557 I know offshoreexcursion here has two new sets of pistons for you. In swap shop.

Need more details on the boat before we can give advice on which combination would suit you the best...The 572 idea is good but there are different combinations to achieve that and I tend to lean towards the shorter stroke bigger bore with a long con rod ... feel free to hit me up if ya wanna chat

Sell everything you have now. Call Mercury Racing. Wait for truck to show up.

1100 hp with roots , carb, under 600 cubic inch , and a small blower is not a reality . At least not on pump gas .

Billy Boats is correct, especially with the key factors of running hard for long and reliability

Are these scratch built or are you rebuilding your current engines?

What parts do you currently have that will be reused?

Agreed... better to be conservative and safe!!

I remember seeing this 598 a while back in the swap. I can't validate build nor dyno sheet however thought I'd post it for the heck of it anyway. Pump gas? There was no build sheet but I'm assuming.