428 in 75 high boy
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Cross-Country
Joined: Nov 2006
Posts: 72
Likes: 1
From: iowa
428 in 75 high boy
Any way to ID 428 other than taking apart? If not how do you ID then? Found a guy who says he has one for 100.00 bucks. Would you need to change anything to put 428 in 75 250 4x4 with automatic? I have 390 in it now. Or is it worth rebuilding a 428 to put in ? thanks cybeast
Senior User
Joined: Apr 2007
Posts: 375
Likes: 0
From: Glenwood, IA
It is posible to tell by the back of the block. A standard 428 will have an A scratch cast and a cj will have a C scratch cast. But this is not a sure thing. The later 428 service blocks did not have those markings. But they had one other way to tell, they had web like ridges running vertical on the lower sides of the block. As far as fitting, you dont have anything to worry about there. It is no different than swaping 390's other than making sure you have the external flex plate. Anyway, for 100 bucks I would take it as a 390 if its not trashed. good luck!!
Fleet Mechanic
Joined: Feb 2002
Posts: 1,483
Likes: 273
From: Tulare U.S.A.
You could mesure the stroke by pulling a plug and putting a piece of welding rod down the hole. The 428s were externaly balanced so it will take a flex plate with a counter weight on it.
Leadmic
Leadmic
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
If the engine is out of the vehicle, ask to pull the oil pan. The crank should have a casting of 'IU' for the correct stroke of a 428. (it could also be a 410 if it is a 390's bore)Either way, if you find this 428 crank, you should be happy with it regardless. Also, look at the front of the block, driver side, and at the front face below the head there might be a '352' casting, or there might be a reverse '105' there. The latter is likely a 391 FT service block, which can and has been bored to 4.13" (428) size. Some of these blocks were even blank in this area, with no casting...
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New User
Joined: Jan 2008
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Likes: 24
Engine specific (Ident) topics like this should go in the engine forum relating to that engine.
Ie: FE forum.
Post the casting numbers of the main engine parts.
meanwhile I'll ask this be moved to the FE forum
as far as "engine to truck" part as per your title..it is the same as a 360/390.
No difference.
They are all identical outside and match to transmissions the same
See you in the FE forum
Ie: FE forum.
Post the casting numbers of the main engine parts.
meanwhile I'll ask this be moved to the FE forum
as far as "engine to truck" part as per your title..it is the same as a 360/390.
No difference.
They are all identical outside and match to transmissions the same
See you in the FE forum
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Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
Originally Posted by 428HIGHBOY
It is posible to tell by the back of the block. A standard 428 will have an A scratch cast and a cj will have a C scratch cast. But this is not a sure thing. The later 428 service blocks did not have those markings. But they had one other way to tell, they had web like ridges running vertical on the lower sides of the block. As far as fitting, you dont have anything to worry about there. It is no different than swaping 390's other than making sure you have the external flex plate. Anyway, for 100 bucks I would take it as a 390 if its not trashed. good luck!!
G.
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
The only sure fire way to identify an FE is to pull the head and measure the bore and stroke. Even if you pull the pan and find a 428 crank, it could still be a 410. As far as the verticle webbing on the blocks, it doesn't mean anything. I've got a 360 with those verticle webs. The mirror image 105 signifies a block with extra reinforcement in the crankshaft area and possibly better metalurgy, but that's it.
For $100, buy the engine. It's got parts you can use, swap or sell. If it's a 428, then congrats. If it's a lowly 360, then you've got a 390 block and a decent set of heads. Years ago I bought a 360/C6 combo on eBay for $30. No typo. Good trany, good heads, and a mirror image 105 block. Good luck!
For $100, buy the engine. It's got parts you can use, swap or sell. If it's a 428, then congrats. If it's a lowly 360, then you've got a 390 block and a decent set of heads. Years ago I bought a 360/C6 combo on eBay for $30. No typo. Good trany, good heads, and a mirror image 105 block. Good luck!
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
The mirror "105" also represents a MCC casting (Michigan Casting Center). Actually 70's blocks may of had a slightly lower tensile strenght. I forget the exact specs but I'll look it up if interested. But with the ribs and other reinforcements it's s non issue casting wise