35 commander salon with twin Ford 427's.  Pulling them out and re powering with new 454's. 

Questions:

1) does anyone have any links to a swap like this?

2) does anyone know anything or have links to modifying the cradle (not sure that's what its called in a boat)engine mounts?

3) anyone have 454's in their 35 commander?  If so what kinda cursing speed are you seeing (and RPM) also what is your planing speed.

The engine parts is strait forward and something I do every day for a living but have a few questions about proper alignment of the new engine's and drivers in conjunction with the shafts.

Any and all opinions, links and comments are ready.  PS I have the super disk (can located it but I know I have it somewhere). 

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Fred 

What props are you running?

Your numbers sound impressive

Fred Calvo said:

My 1969 sports cruiser was repowered with twin 8.1 EFI crusaders just prior to my purchase. According to the owner of the marina that did the repower the fuel consumption was cut drastically from the previous power plants, what they were I have no idea. Here is what I am getting out of these motors;

2000 RPM @ 15 KNOTS / TABS TRIMMED AT ABOUT 1/2

2200 RPM @ 18 KNOTS / TABS @ FULL TRIM...... THIS SEEMS TO BE A SWEET SPOT

2600 RPM @ 23 KNOTS / TABS @ HALF

3200 RPM @ 28 KNOTS / TABS QUATER TRIMMED

OVER 3200 RPM'S............ TRIED IT ONCE HAVEN'T DONE IT SINCE....... HOLD ON TIGHT IF YOU DO.

I just bought a 31' Sports Cruiser, want to put 383s in it so it doesn't take me four hours to cross Lake Michigan.  Sounds like this hull isn't going to handle speed well?  It is a fairly flat bottom.  Do you have the stock trim tabs or something bigger?  Mine has no tabs, I would add them with bigger engines.  Maybe I'm better off sticking with the stock 350Qs, if they run, I won't know 'till I get the boat in the spring and try to start it.  I'm beginning to think this isn't the boat for occasionally crossing Lake Michigan.

Fred Calvo said:

My 1969 sports cruiser was repowered with twin 8.1 EFI crusaders just prior to my purchase. According to the owner of the marina that did the repower the fuel consumption was cut drastically from the previous power plants, what they were I have no idea. Here is what I am getting out of these motors;

2000 RPM @ 15 KNOTS / TABS TRIMMED AT ABOUT 1/2

2200 RPM @ 18 KNOTS / TABS @ FULL TRIM...... THIS SEEMS TO BE A SWEET SPOT

2600 RPM @ 23 KNOTS / TABS @ HALF

3200 RPM @ 28 KNOTS / TABS QUATER TRIMMED

OVER 3200 RPM'S............ TRIED IT ONCE HAVEN'T DONE IT SINCE....... HOLD ON TIGHT IF YOU DO.

Scott,  

I can't answer whether a 31 SC can cross lake Michigan, but the main issue with 350Qs is that routine parts like distributor caps and rotors, and manifolds and risers are becoming difficult or impossible to find. Dist caps are scarce and as of today, the 318 rotor is impossible.  I was lucky 3 years ago to find Barr risers that fit onto my Osco manifolds (with a little tweaking), and my boat is FWC so I didn't need to replace manifolds. If I did, I think I'd be SOL. 

Jim

Thanks.  If they run, electronic ignition will be one of the first mods.  Full FWC also, 500 hours in Sturgeon Bay water, and spent most of it's life in indoor storage.  It is like a new boat everywhere I've looked, the manifolds are probably in good shape.  Everything rubber is probably not, or at least I don't want to trust it is, that will be the first thing I'll tend to.

But if the engines are bad, I'm less enthusiastic about upgrading the engines if the hull can't take advantage of more HP and torque.  That is why I'm wondering about handling at higher speed.  28 knots noted as max comfortable speed isn't all that fast, 383s should push it along well above that.

Jim Frens said:

Scott,  

I can't answer whether a 31 SC can cross lake Michigan, but the main issue with 350Qs is that routine parts like distributor caps and rotors, and manifolds and risers are becoming difficult or impossible to find. Dist caps are scarce and as of today, the 318 rotor is impossible.  I was lucky 3 years ago to find Barr risers that fit onto my Osco manifolds (with a little tweaking), and my boat is FWC so I didn't need to replace manifolds. If I did, I think I'd be SOL. 

Jim

Scott, an old friend had a 31 sports cruiser with twin 427's. She would do 30 knots without breaking a sweat. I don't know what she would do WOT. Handled the 600 ponies with no problems. 

Copied from my original survey;

REDUCTION GEAR(S) : ZF Hurth S/N-Port-15001M Strbrd-15002M
MODEL(S) : HW Ratio – 2:68
PROPELLER(S) : 4 blade 21D X 27P

Jeremy Goldstein said:

Fred 

What props are you running?

Your numbers sound impressive

Fred Calvo said:

My 1969 sports cruiser was repowered with twin 8.1 EFI crusaders just prior to my purchase. According to the owner of the marina that did the repower the fuel consumption was cut drastically from the previous power plants, what they were I have no idea. Here is what I am getting out of these motors;

2000 RPM @ 15 KNOTS / TABS TRIMMED AT ABOUT 1/2

2200 RPM @ 18 KNOTS / TABS @ FULL TRIM...... THIS SEEMS TO BE A SWEET SPOT

2600 RPM @ 23 KNOTS / TABS @ HALF

3200 RPM @ 28 KNOTS / TABS QUATER TRIMMED

OVER 3200 RPM'S............ TRIED IT ONCE HAVEN'T DONE IT SINCE....... HOLD ON TIGHT IF YOU DO.

What is your fuel burn at your listed rpm/ knots 

And what RPM  does your boat run at at WOT. ?

Fred Calvo said:

Copied from my original survey;

REDUCTION GEAR(S) : ZF Hurth S/N-Port-15001M Strbrd-15002M
MODEL(S) : HW Ratio – 2:68
PROPELLER(S) : 4 blade 21D X 27P

Jeremy Goldstein said:

Fred 

What props are you running?

Your numbers sound impressive

Fred Calvo said:

My 1969 sports cruiser was repowered with twin 8.1 EFI crusaders just prior to my purchase. According to the owner of the marina that did the repower the fuel consumption was cut drastically from the previous power plants, what they were I have no idea. Here is what I am getting out of these motors;

2000 RPM @ 15 KNOTS / TABS TRIMMED AT ABOUT 1/2

2200 RPM @ 18 KNOTS / TABS @ FULL TRIM...... THIS SEEMS TO BE A SWEET SPOT

2600 RPM @ 23 KNOTS / TABS @ HALF

3200 RPM @ 28 KNOTS / TABS QUATER TRIMMED

OVER 3200 RPM'S............ TRIED IT ONCE HAVEN'T DONE IT SINCE....... HOLD ON TIGHT IF YOU DO.

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