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Engine Block Sourcing And Interchange

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Engine Block Sourcing And Interchange « Previous Next »

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Brad Watkins
New member
Username: brad68

Post Number: 1
Registered: 03-2008
Posted on Thursday, April 10, 2008 - 10:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

What a great board! I am new to the Gray Marine engines, but the boat has been in my family for 25 years. Please advise.

The boat is a 1954 Century Resorter 16' with a Gray Phantom 6-112

The engine is original to the boat and unfortunately, being from Maryland, the boat was in saltwater for most of it's life. The cylinders have begun to show signs of blow-by and it seems to be time for rebuild. I am very fearful that the water jacket is thin and that the block may not be the best candidate for a rebuild. Here is the engine information:

Engine Data Plate:

Century Boat Company
Gray Marine Engine Company
Model PH-6-112
Engine Serial Number G6953

Block Casting Numbers:
H30R F600A S 6

Head Casting Numbers:
F600A 827 5


It is my understanding that the 112Hp engine utilized the F600A 226 cu-in Continental block. Are there any other applications that may have used glycol, or at least freshwater cooling? I am having a hard time finding a block and was hoping that someone could shed some light on interchangability and sourcing. Thanks in advance.
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Bruce Hall
Senior Member
Username: bruce

Post Number: 169
Registered: 07-2002
Posted on Thursday, April 10, 2008 - 02:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Check with Duby marine at dubymarine@wzrd.com in Buffalo NY. Hundreds of fresh water graymarine engines in stock for parts or rebuilding.
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Brad Watkins
New member
Username: brad68

Post Number: 2
Registered: 03-2008
Posted on Thursday, April 10, 2008 - 02:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks for the tip. I actually already have a call in to John at Duby. He said he would have to check and get back to me.

I am wondering if it is possible to use an industrial block and if so, are there other Continental blocks that will interchange? I didn't get a chance to ask him as it was closing time. Thanks. I guess the flywheel forward configuration is going to limit me unless I can use all of my internals.

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