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Pampered-Z · 05-14-2009, 12:30 PM

You can't really do much with a 305, even getting to 350 HP is a bit tuff. The 305 is such a small bore that there is no room for big valves so it just can't move air and breath.

The 305 HO/TPI heads (or something simular) have slightly larger values and thus flow a bit more, adding a mild cam will put you in the 210-235HP range. Also remember that 305s aren't designed to be spun high, keep it under 6K or you run the risk of cracking the mains.

So as others have said, unless you are running some type of class where you would be restricted to a 305 a 350, even a mild 350 would be cost effective and able to be spun higher. And don't waste the money on strocking a 305, we played with them (334 CI ) back in the 80's and a mild 250 will still pull better numbers at 1/2 the cost.

Not really a boat person, but can't you change props?

05-14-2009, 12:30 PM	#16
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	You can't really do much with a 305, even getting to 350 HP is a bit tuff. The 305 is such a small bore that there is no room for big valves so it just can't move air and breath. The 305 HO/TPI heads (or something simular) have slightly larger values and thus flow a bit more, adding a mild cam will put you in the 210-235HP range. Also remember that 305s aren't designed to be spun high, keep it under 6K or you run the risk of cracking the mains. So as others have said, unless you are running some type of class where you would be restricted to a 305 a 350, even a mild 350 would be cost effective and able to be spun higher. And don't waste the money on strocking a 305, we played with them (334 CI ) back in the 80's and a mild 250 will still pull better numbers at 1/2 the cost. Not really a boat person, but can't you change props? __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!