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Old 09-09-2007, 01:56 PM
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update gen VI not gen v 454 marine roller motor

i came across a gen v 454 4 bolt main marine motor today. the guys wants 300 bucks for the short block with oval port heads. he said it was a 450hp motor. it's been sitting for 3 years. the boat had dual 454's but caught fire while in dry dock. it will need a rebuild since there is a little rust on the cylinder walls.

is there a difference between the marine motor and car motor?

it that a fair price?

sorry for the newbie question but i don't know chevy at all. i was thinking of using it in my 67 firebird.


update it's a gen VI -- 10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen.VI

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Last edited by 71javelin; 09-10-2007 at 05:33 PM.
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Old 09-09-2007, 02:36 PM
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Generally marine applications are adaptable and vice-versa. I'm thinking it might have a reverse rotation cam in it though. If so that'd have to be changed of course. I'm sure someone here will have the full story on what's needed. Marine engines are usually built with good stuff from a durability standpoint.
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Old 09-09-2007, 05:40 PM
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I'm not so sure a 454 with oval port heads is likely to make 450HP. But I've been fooling around with aircraft for the last (undisclosed, I'm old) years.

Further, I don't believe most marinas sell high octane gas and therefore, the 450HP isn't coming from high compression.

Marine applications are designed to run at RPM all day and to do so, they're sometimes detuned for service life and fuel burn.

Yup, just opinions.
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Old 09-09-2007, 05:51 PM
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i forgot all about having one motor with reverse rotation.

i looked up the newer 454 marine motors and around 400hp and up had rectangle port heads. but that doesn't really make much difference to me since i wouldn't be using the heads any ways.

i called him and asked for the #'s off the block.

any guess if it will have forged rods and crank? it looked like all the new 454 marine motors have forged crank, rods and pistons.
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Old 09-09-2007, 06:54 PM
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some of the marine engines (at least sbc's) had inconel exhaust valves also
Shane
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Old 09-09-2007, 07:06 PM
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Quote:
Originally Posted by Dugg
Further, I don't believe most marinas sell high octane gas
Au contraire, at least the ones around here do.

Quote:
Originally Posted by 71javelin
any guess if it will have forged rods and crank?
I'm guessing yes.....
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Old 09-09-2007, 07:17 PM
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The marinas around here also sell high octane gas.$$. With all the Chevy powered air boats down here they have to.

Depending on which of the two engines you are getting it may or may not be reverse rotation.

Vince
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Old 09-09-2007, 10:05 PM
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if it is a reverse rotation. can it be setup to run the right way?
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Old 09-10-2007, 05:35 PM
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ok casting #"s say it's 10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen.VI

anyone know about the vortec motors?

will gen IV heads fit on a gen VI block?

Last edited by 71javelin; 09-10-2007 at 05:47 PM.
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Old 09-10-2007, 05:42 PM
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Quote:
Originally Posted by 71javelin
if it is a reverse rotation. can it be setup to run the right way?
Sure, just takes a cam swap.
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Old 09-10-2007, 05:48 PM
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Wikipedia's info on the vortec 7400 only claims 290 horsepower @ 4000 and 410 ft/lbs torque @ 3200
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Old 09-10-2007, 08:44 PM
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thanks, i've been searching for info on it. i'm guessing it's a mercruiser Bravo, it had fuel injection, roller cam, and large oval port heads.

if i get the block i'll be putting the merlin rectangle port heads i have on it with a nice big cam.
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Old 09-11-2007, 07:53 PM
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If its a sterndrive, chances are its not reverse rotation, especially since you said its a bravo. Bravos can turn either direction, so the reverse rotation is simply a shift cable direction change. There are several reputable sources on the topic (none of which I have bookmarked on this computer) but I did have this one:

http://www.boatpartsinfo.com/engine-rotation.html

Its HIGHLY unlikely for that engine to be reverse rotation. The whole point of the later generation outdrives was so they didn't have to make reverse engines, but like was said, change the cam and the distributor gear and you're moving the in the right way.

PS... I forgot to mention... if it was ever a saltwater block (meaning that salt water was used to circulate in the jackets) you cannot use antifreeze in it. Ethylene glycol and salt don't mix, and no matter how much you flush it the pores will always retain some salt.

Last edited by curtis73; 09-11-2007 at 08:45 PM.
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Old 09-12-2007, 01:52 PM
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I bought a 427 marine engine that was in a house boat along with another 427 and twin stern drives. It was reverse rotation. I changed the cam and timing gear setup and it ran great. It had all the best stuff from Mercruiser. Remember engines used in this application are bullet proof, because they are under a constant load. There is no coasting down hill on the water.
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