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New Project. Should be fun.

  • Thread starter Thread starter 98Snakebite
  • Start date Start date Jun 2, 2007

98Snakebite

New Member
Mar 12, 2006
9
0
1
Beavertown
Jun 2, 2007
#1
  • Jun 2, 2007
  • #1
Ok so here's the deal. I am finally getting around to working on my old boat. It's a mid 80's 21' Supra Ski boat with a 351w. 2 years ago, the engine died. I have a redone 351 mexican block sitting around, so here is my plan. I wanna build it with a f303 cam and roller lifters from a 5.0. The heads on the boat are brand new rebuilt, so I'll re-use them. On top of this I want to stick a truck lower EFI intake, 42lb injectors, and a 03-04 Cobra Blower. I have been a fabricator in my younger days and was figuring on building an aluminum box plenum adaptor to go between the sc and manifold. I have a megasquirt II I would run it with and would use lake water through the factory intercooler core (if I can find one).

What do you guys think? Sound feasable?

I think it sounds like fun.
 

Juiced87Notch

Member
Sep 30, 2004
500
0
16
Gresham, Oregon
Jun 2, 2007
#2
  • Jun 2, 2007
  • #2
one things left... progress pics
 
8

84Gt350

Founding Member
Sep 18, 2000
298
0
16
Kirkland, WA
Jun 4, 2007
#3
  • Jun 4, 2007
  • #3
Do a lot of research first, a friend of mine went thru 4 302-351s in his boat project before he figured out there were major differences in the marine engine like balance, pistons in backwards depending on rotation, cams etc. You are probably better off trying to just freshen up the one you have without changing out many parts. My boat has 440s and their are a lot of marine specific parts in them.

Dan
 

98Snakebite

New Member
Mar 12, 2006
9
0
1
Beavertown
Jun 4, 2007
#4
  • Jun 4, 2007
  • #4
84Gt350 said:
Do a lot of research first, a friend of mine went thru 4 302-351s in his boat project before he figured out there were major differences in the marine engine like balance, pistons in backwards depending on rotation, cams etc. You are probably better off trying to just freshen up the one you have without changing out many parts. My boat has 440s and their are a lot of marine specific parts in them.

Dan
Click to expand...

Well I would, But the block is cracked.

I will double check the balance on the crank to make sure it matches the flywheel-thingy. I know the rotatation is right, because I put a starter out of a 95 f150 on it a couple years ago. The balance is a good point though because sbfs vary from 351 to 302 and HO to non HO. Have to read up on it. Also, a lot of the marine specific parts are due to corrosion control factors and not being able to tell if a owner will plunk their ski boat in the pacific, which I never will.

Thanks for the catch.

Anyone Else? Anybody know where I can find the intercooler that goes in the intake? I have a thread in the classifieds about it. Also, does anybody with a 03/04 know the stock lower pulley diameter?


P.S. I bought the blower today. (Thanks Rootus!)
 

LordMustangGT

Member
Jan 9, 2006
118
0
17
Port Orchard, WA
Jun 4, 2007
#5
  • Jun 4, 2007
  • #5
deffentley use some good parts, boat motor are meant to do 5-6000 prm all day, so use forged parts if you got the $$$$.
 

98Snakebite

New Member
Mar 12, 2006
9
0
1
Beavertown
Jun 4, 2007
#6
  • Jun 4, 2007
  • #6
LordMustangGT said:
deffentley use some good parts, boat motor are meant to do 5-6000 prm all day, so use forged parts if you got the $$$$.
Click to expand...

DSS Forged Baby. Balanced and blueprinted w/ ARP rod bolts. I am used to mod motors. Windsors are cheap by comparison.
 

98Snakebite

New Member
Mar 12, 2006
9
0
1
Beavertown
Jun 4, 2007
#7
  • Jun 4, 2007
  • #7
Juiced87Notch said:
one things left... progress pics
Click to expand...

pics coming soon.
 

blkhorse

Founding Member
Oct 30, 1999
345
1
18
Jun 5, 2007
#8
  • Jun 5, 2007
  • #8
I just rebuilt a 89 baja 220 sport,there is a lot of things that need delt with.besides head gaskets and freeze plugs the hard parts in a long block are the same car or boat.the marine engine uses different clearances(rod,main,ptw).if the engine is under a cover,you MUST use marine alternator,starter,fuel pump ,ign system,flame arrestor.the water pumps have bronze impellers.if you run wet exhaust(highly recommended) if have to be careful on cam selection so you don't get reversion.then after all that are you sure your outdrive up to the power,bravo 1 or king cobra? these are just a few things to address,and the police at lakes around here are checking engine compartments for complaince.by the time your done you could have KB on your car.good luck,fun projects but expensive
 
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