1959 Chevy truck with 283 - engine code stamps - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-06-2020, 06:28 PM
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1959 Chevy truck with 283 - engine code stamps

I am looking at a truck and want to verify the engine is a 283. The engine stamp is F630S. I am confused about deciding it.
Does this mean...???
June (6th month)
30th (day of June)
What is the 'S' ?

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Old 02-06-2020, 07:32 PM
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"S" is the application suffix code, denotes what it is and what type vehicle it was originally installed in.

The only "S" code I could find denotes "1962 327, Powerglide transmission, from a full size car".
"S" code did not get re-used for any other application or year(sometimes this was done, more often in the late 1960's-1970's, why I noted this for you).

All other codes that started with "S"....SA, SB, SC, SD, SG, SK, SL, SR, and SS from the small journal block era were also only used for 327's.

What is the cast number off the driver side rear bellhousing flange area of the block, just behind the driver side head mounting surface??
This can be used to confirm whether the block casting is a 3.875" bore block(283 and code was mis-stamped) or 4.00" bore and code is correct.

Gut tells me right now it appears you have a 327, and not a 283...but casting number will be the method to confirm this.
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Old 02-06-2020, 07:36 PM
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Look at the harmonic balancer. If it is 1 piece and does not have a rubber ring and outer cast ring its likely a 283
If you finger fits through the center hole of the bottom pulley and there is no bolt holding the balancer on then its likely a 283
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Old 02-06-2020, 08:56 PM
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I'll backstop Eric, there are no small block S codes prior to 1962 and all were used on 327's.

Check the block's casting number, it is on the driver's side of the block's bellhousing mounting flange.

Dampers were notbolted on the SBC till 1968.


Last edited by BogiesAnnex1; 02-06-2020 at 09:14 PM.
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