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My '77 Baja jet boat has a 454 marinized by Hardin Marine coupled to a Berkeley Jet drive. The engine is a Hardin H405. Relevant specs are: Mark IV block, 8.8:1 compression ratio, Holley 3310, Edlebrock Torker intake, Hardin jacketed log exhausts, open cooling system, 360 HP (as rated by the manufacturer). Marinization consists of, amongst other things, different head gaskets (Fel-Pro 17040) and brass freeze plugs. I purchased the boat from the original owner in 1989.
Engine stamping is T04226XH T=Tonawanda plant, 04226 = April 22 1976 XH = ??
I am just throwing this out there. I know several Forum members have stamping libraries and stamping guides. Has anyone come across the XH stamping before?
Last edited by '73and'75; Jan 18, 2022 at 04:07 PM.
Reason: transposed letters
Along the same lines I have a stovebolt six in my Boat....it could be spin-doctored into I have a Corvette engine in my boat....as in 1953 Corvette. Interestingly its rated at 160 hp with a single large one barrel where-as the 53 was 3 one barrels and only 150 hp.
BOTH are very heavy engines!
8.9 Comp ratio signifies low compression and 89-91 octane pump gas.
XH comes back as 1968 396 Truck engine. But that can't be right as your engine is a 76'.
Engines built specifically for marine applications had different stamp codes altogether than passenger car/truck......
What is the block casting number on the bellhousing ? What is the cylinder head part number under the valve cover? This will help sleuth out what this engine exactly.
XH comes back as 1968 396 Truck engine. But that can't be right as your engine is a 76'.
Engines built specifically for marine applications had different stamp codes altogether than passenger car/truck......
What is the block casting number on the bellhousing ? What is the cylinder head part number under the valve cover? This will help sleuth out what this engine exactly.
Jebby
Yes, and the hull is a '77. I will check the casting numbers and dates for the heads and block and will post. I do know the heads are rectangular port.
Hardin produced at least 5 different configurations of BBC during this time period. Ratings were dependent upon the components of the build and the application such as v-drive, jet drive, or direct drive. Components varied including Intake and exhaust manifolds (above water, over the transom, below water), carburation, heads, flame arrestors, distributors (single point, dual point) -- all resulting in varied horsepowere ratings. Keep in mind these HP ratings were gross ratings, as there were no accesories (PS, A/C, water pump), emissions equipment, mufflers, or drivetrain losses to account for.
Just trying to learn more. Thank you all for the info.
Yes, and the hull is a '77. I will check the casting numbers and dates for the heads and block and will post. I do know the heads are rectangular port.
Hardin produced at least 5 different configurations of BBC during this time period. Ratings were dependent upon the components of the build and the application such as v-drive, jet drive, or direct drive. Components varied including Intake and exhaust manifolds (above water, over the transom, below water), carburation, heads, flame arrestors, distributors (single point, dual point) -- all resulting in varied horsepowere ratings. Keep in mind these HP ratings were gross ratings, as there were no accesories (PS, A/C, water pump), emissions equipment, mufflers, or drivetrain losses to account for.
Just trying to learn more. Thank you all for the info.
Love that boat......metalflake is not dead!
What baffles me about all of these old BBC boat engines is that they pickup about 4-5 MPH by swapping to a mildly blended set of large oval ports......rec port heads simply do not work until over 6000rpm which a boat will and should never see......
with that 215 hp rating it is listed as an oval port LS4. the 365 mercruiser is a 71 chevelle (iron head) LS6 engine with a really crappy cam thrown in. forged small dome pistons, forged crank, 7/16ths dimple rods. but reversion in a car is reduced performance. reversion in a boat entails water sucked into the engine from the exhaust at idle wrecking the engine. every cam upgrade requires more length from the exhaust port to the point water mixes with exhaust flow. it is listed here. http://www.1968ss.com/BBCsuffix.asp
Marine 454 Engine Stamp
