Kirk, your engine number breaks down as follows:
F = Flint Plant (T = Tonawanda Plant)
4 = Month (April)
17 = Day
S = 6000 series and up, "283"
The "S" was also used in 1958 for the same models. However the '57 283 is
the only engine block NOT have the side motor mount bosses, it's sides are
smooth. Side motor mounts were not introduced until 1958. So if the sides
of the lower block are smooth and it's marked "S" then it has to be a '57.
All '58 and newer blocks have the side mount bosses whether they were used
Hope this helps,
'56 8400 Wrecker
----- Original Message -----
From: "kirk pierce" <email@example.com>
To: "OleTrucks mailing List" <firstname.lastname@example.org>
Sent: Sunday, March 25, 2001 8:22 PM
Subject: [oletrucks] 283 in a '57?
> Hello List,
> I have 2 questions for the history buffs among us. I have a '57 1/2 ton
> stepside whose 6 cylinder was disassembled and allowed to rust up before I
> purchased the truck. I removed a V8 from a 1957 Chevrolet
> bus and put it in the truck. I did not have to do any work to the bus
> motor, so I didn't have the heads off to measure things.
> 1. I believe that motor is a 265 or 283 but can not be sure. The
> on the block in front of the right hand cylinder head reads F4I7S. Does
> anyone know what the displacement is from this number?
> 2 What year was the engine built?
> I am hoping the engine is really a 1957 and that it was an option in the
> stepside 1/2 ton. It would make me feel like my truck is more
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959