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#1 |
Registered User
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
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Marine vs. land 502?
Saw this ad on Craigs tonight, and am wondering what the differences are between marine spec GM motors and Vehicle spec motors?
http://minneapolis.craigslist.org/hn...939270930.html ...and, could a person use all those components in the ad on a bored out 454 block in their truck?
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1971 C-20 350/350 Last edited by 05crewcab; 09-09-2010 at 11:46 PM. |
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#2 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Marine vs. land 502?
The only difference in the base motor that you may find is that the rotaion is counter clockwise or clockwise. If its a two screw boat then it had one of each
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#3 |
Registered User
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
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Re: Marine vs. land 502?
so what determines the counter rotation? is it dictated by the cam and distributor?
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1971 C-20 350/350 |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Marine vs. land 502?
that is alot of money for a parts motor// i see l 454 complete motors for less that are ready to drop in and run
tes cam is different on counter rotation,even if its regular rotation cam isnt good or the street block is trash but everything else is good?? i'd b skeptical
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 09-10-2010 at 07:51 AM. |
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#5 |
Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: Marine vs. land 502?
from what ive found reading on the net and dealing w/ my bosses 578 stroker boat motor...
boat blocks come straight off the same assembly line as car blocks. the blocks are then sent to whoever bought them and they are prepared there for boat use they do use a BOAT only cam (different lift/duration since boats spend their lives under a load) they use different head gaskets to withstand water (salt) they may line the inside of the water jackets to keep corrision at bay not all boats run reverse rotation water pumps it will def. be HD gm parts inside (steel crank, 7/16 rods, etc.) so it might be worth the money if you already have a good block.... |
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#6 |
Registered User
Join Date: Dec 2009
Location: California, Maryland
Posts: 544
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Re: Marine vs. land 502?
Since marine engines spend their life at near full loads, they are usually a 4 bolt as the one in the ad.
If the engine in the ad has a cracked block, it is probably because of ice. Heads therefore are also suspect and may have cracks that are yet to show.
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72 Fleet (died) 78 Step (sold) 55 Step named Fred (sold) 00 F150 68 Step (named El Scorcho by PO) Build thread for the new El Scorcho http://67-72chevytrucks.com/vboard/s...d.php?t=392932 |
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#7 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Marine vs. land 502?
Cam determines the rotaions, you also need a reverse starter, water pump.
The firing orders would be Std. Rotation 1-8-4-3-6-5-7-2 Reverse Rotation 1-2-7-5-6-3-4-8 In a 2 screw boat and the screws turned the same way then the boat would always want to pull to port (right) or starboard (left) |
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#8 |
Registered User
Join Date: Jun 2010
Location: British Columbia
Posts: 192
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Re: Marine vs. land 502?
The problem with this motor is its a gen V i guess thats not a problem unless your building a gen V or gen VI they have one peice rear seals so the crank is useless in blocks before 1993 the pistons are 4.470 bore wich is 220thou over bore on a 454, the heads appear to be the non adjustable valve train and will probably only fit the later block as the water core holes wont line up. like said it would be good if buildin a later 454 ho or 502 again but is useless really on the older stuff. The rods are good but 800 dollars and all you will use is a set of chevy dot rods isnt worth it.
My 2 cents ![]()
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If you can't impress them with your inteligence, dazzle'm with your stupidity 1969 GMC lwb 2wheel drive can you say big stroker motor to come hehe |
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#9 |
Moderator
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Location: Southern Cal
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Re: Marine vs. land 502?
I think you have these reversed...
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#10 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Marine vs. land 502?
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#11 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Marine vs. land 502?
port-left
starboard-right LOL
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#12 |
Registered User
Join Date: Aug 2008
Location: Lantana, TX
Posts: 419
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Re: Marine vs. land 502?
I would keep looking. Nothing wrong with boat motors, I have one, but you need to make sure they aren't corroded too bad. Crank, rods, pistons, heads, etc. are all the same as a automobile.
Edit: The other guy is right though about the Gen V block. It doesn't have a provision for a mechanical fuel pump, so you would have to go electric. The only other option would be a Gen 6, you can't bore out a Gen 4 to accomodate a 502 piston. Last edited by ulakovic22; 09-10-2010 at 11:09 PM. |
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