[Fr. Frank]

41 mph with only a 225? The 20' Seafari test in '72 with the OMC 225hp 350ci "stringer drive" only achieved 45 mph as tested. No specs on the OMC 245hp 350ci

The Seafari w/ the Merc 228, however reached 48 mph.

Here's a 4 bbl manifold for that 250 ci I6.
4bb manifold [image]http://app.ecwid.com/image/2712429?ownerid=149402[/image]

Here's another:
4bbl intake [image]http://www.cliffordperformance.net/Merchant2/graphics/00000001/42-4501wh 300.jpg[/image]
(space in address won't let pic appear. you have to paste the links)

Here's a really good cam kit. Claim is 30% more hp than stock with a minimum 450 cfm air intake. Tech tips on HotSix.com is a recommended 560-650 cfm carb set.
Chevy 194-230-250 272 Hyd Cam & Kit

For more good straight six performance parts, go to Stove Bolt Engine Co or

or Clifford Performance 4bbl intake