Take a look atbthe new gm perf block for a big bore engine, the cylinders arent siamezed so it offers better cooling would make a great big bore cube 540-557 and still a standard deck height.

and if he did,,we'd get 7 pages from others against him,,just saying and I'm neutral on it these pissing contests and self promotions.

I used the new Gen 6 GMPP short deck block for my 548 build. Summit price matched it @$1800 and it worked great. Has a lot of nice modern provisions on it and is much beefier than standard production gen 6 block

Happen to have a part number handy?

pretty sure this is it

http://www.gmperformancemotor.com/parts/19170540.html

That one is siamese. Only one block in the 2015 GMPP catalog is listed as non siamese, and states max bore as 4.310 which makes sense. So the big bore open block statement had me wonder what part number he is referring to.

this is the one I bought: Bowtie Sportsman Block: Max Bore 4.600" already clearanced for 4.500" crank, splayed main bolts as well.
]http://www.jegs.com/i/Chevrolet-Performance/809/19212192/10002/-1?parentProductId=2812294

that one has siamise bores.

What about the way big power (700HP and up) is run?

Example I only ran my boat on avg. 5-6 times a year. And if I ran it at idle for 30 mins to get to lake and then cruised (3800RPM) to my beach spot and sat all day and then came home. Would that extend my longevity?

I know big lift cams, blowers,and turbos are hard one engines BUT if your not running them super hard all the time can that buy 200 hrs on a motor?

Brad Malcuit a circle track builder told me once 1000 laps after that your on( borrowed time) BUT we ran the snot out of it!!!!

I do agree. And probably why, a guy who has a big twin engine vee bottom, who spends alot of time at high rpm or wot, will wear stuff out faster than the small boat, who cant stay in it very long due to being hull limited, like chine walking , etc, or simply a smaller lake where you are real estate limited. I know some guys who rarely hold their engines wot, and some who do for ridiculous amounts of time. The guy who runs his big power stuff wide open for 20,30 miles at a crack, surely better have his chit together, or as we see very often, the end result of what happens when its not.

Some things that are rarely spoken about, is valve seat material, and valve seat widths. If your building a big power offshore endurance engine, that is an area that should not be overlooked imo. I paid extra money for all new tucker seats in my heads when they were being redone, per the machine shops recommendation . I believe teague uses them as well as mercury racing on some of their newer big power stuff. Fancy high flow race car valve jobs, might not be what you want in an offshore endurance engine either.