347sbf prop size for mustang

Tyrone,

Tyrone,

Hopefully you get through but not optimistic.  Billy hasnt been on here is about 3 years.  This is going way back but last email I had for him was hobiedr@bellsouth.net.

75 Tique wrote: Hopefully you get through but not optimistic.  Billy hasnt been on here is about 3 years. .

Wow oh wow, thanks Keno! That lead to so many links of good info. Think I'll stick with my 12x15 for the moment, from all I've read it came with a slightly larger pitch being the moody 302 was a 235hp/9.5comp motor. I spoke with acme and they suggested a 13x13 but I don't have clearance for it, I've only got 7/8 with current prop

There are others here with 302 stroker experience in the 16’ hull. Reid has been running a pretty hot 347 in his 73 mustang for many years. I’ve got a 331 in my ‘71 Skier. Billy’s was a 331 too, btw… and he really liked a 13” diameter OJ 4-blade IIRC… which I would wholeheartedly NOT recommend for safety reasons.

12x15 OJ legend 3-blade and Acme 1214 would go to the top of the list. I would like to see some specs on how you squeaked 450hp out of a RH 302 based engine without pushing the powerband away from the useful marine range and into the auto range. If you’ve got a really wild cam and/or a lefty in there, all bets are off.

Thanks Trb, it's still Rh also it's a late 302 roller block. Scat balanced assembly,11.1 comp, custom comp roller cam 558 lift 112lsa, procomp heads with 5 angle valve job, cnc ported, OG boss 302 ported intake man, Og Barry Grant 825 carb with blue cones, ported Hmm aluminum exhaust. Made best power between 5800-6200, yes I know it's not a typical 44-4800 marine engine, but I like fast point A to B racing

Dude this boat sounds sweet
Any chance you have video of a hole shot

67 nat, been working alot so haven't got a chance to take it out. Also Trb, competition cams will grind you whatever you, give them a call if you want something special, and as far as the boss comment. I used a original boss intake my uncle gave me due to the stock 2.36 intake runners to work with the as mentioned Pro comp heads. So no mention of anything Cleveland. The engine is a pretty basic mild build and Rh still runs as simple as Lh

I tried attaching pics, but i'm unfamiliar with how to do it on this site. I'm using a Boss 302 engine intake that came on the 69-70 boss mustangs. Used they go for around 700 bucks on ebay and other forums, they have large intake runners that can't be used on stock 302 or 351w heads as such as the D0oe heads that came on my Hmm 302. I built this engine no different than the ones in my 77 f100, 78 f00, 72 Maverick, 74 vette aside from Rh vs Lh

Mustang347 wrote: I built this engine no different than the ones in my 77 f100, 78 f00, 72 Maverick, 74 vette aside from Rh vs Lh

Mustang347 wrote: , ported Hmm aluminum exhaust.

Cleveland 4bbl heads had huge ports.  The true Boss 302 used those heads and made great top end power.

Might check to see what rpm the prop is safe to turn.  In drag boats the props are known to fail but they are pushing a lot more horsepower.