21 Hull #136...Restoration...Started - Page 15

Islandtrader · #**141** 11-25-2010, 04:41 PM

EFI with 350 Ponies.

cdavisdb · #**142** 11-25-2010, 10:04 PM

That should make it go FAST!

Its also heavy, about 1100 lbs(I think) with prop. How does that compare to the weight of the engines the hull was designed for? Any balance issues?

Is that a bored out 350 or a bigger block?

Connor

Bushwacker · #**143** 11-26-2010, 12:23 AM

I think it's a small block with a stroker crank in it, maybe from a 400 ci small block? Only downside I can think of is the combination of short Chevy rods + longer stroke = more side load on pistons. The 400" engines weren't very durable because of that, but maybe the 383 has longer rods or shorter stroke than the 400. It's a pretty popular swap among hot rodders, so it's durability must be better than the 400.

McGillicuddy · #**144** 11-26-2010, 01:02 AM

Gee Terry, I think your boat will be fast

strick · #**145** 11-26-2010, 04:13 AM

It is a small block. Nice choice Terry. When I was rebuilding my 25 the mechanic said that engine would be a good choice should I be unhappy with the amount of HP the current engine has. But I'm happy for now

strick

Islandtrader · #**146** 11-26-2010, 10:51 AM

Quote:

I think it's a small block with a stroker crank in it, maybe from a 400 ci small block? Only downside I can think of is the combination of short Chevy rods + longer stroke = more side load on pistons. The 400" engines weren't very durable because of that, but maybe the 383 has longer rods or shorter stroke than the 400. It's a pretty popular swap among hot rodders, so it's durability must be better than the 400.

Thanks guys !

This is probably to much info. but for us gear heads here you go.

The original 350 uses a B&S of 4.00 x 3.48

The new small block is 377 with a B&S of 4.0 x 3.75.

The stroker is a small block with a B&S of 4.030 x 3.75.

Weight is actually 12 pounds lighter than a 350. More aluminum.

The total package is approx. 300 # more than a straight 6. However I don't think that will change the balance to much since the boat was offered with 2 straight sixes and that would more than offset the small block. Any way with a extra tank up front and trim tabs I should be fine.

Blue_Heron · #**147** 11-27-2010, 10:20 PM

Quote:

STROKER

Nice. Terry, you thinking of going into ocean racing? 350 ponies ought to make that 21 scoot!
Dave

Islandtrader · #**148** 11-29-2010, 11:23 AM

Quote:

you thinking of going into ocean racing?

NAW, I just want to get out to the Grouper holes in a hour or less (35 miles off shore).

In the old days of street drag racing we would call this set up a SLEEPER! It might be fun to dust off few go fast boats with a hole shot

Bushwacker · #**149** 11-29-2010, 12:02 PM

I think the "21" was a sleeper from the very beginning! Moesly blew off many of the bigger 1000 hp boats with a 21 running twin 100 hp Mercs!

ian_upton · #**150** 12-04-2010, 10:15 AM

Been lurking for a while watching your 21 come together. Although not a SeaCraft, I have a 20 foot Bertram project going through the same restoration.

Where did you end up picking up the 383 stroker?

I have been watching www.marinepowerservice.com and Doug Russel but have not seen any price movement.

I would be interested in hearing where you purchased the pwer package from.

Best of luck!

Ian Upton