kwtx66

Local FB Marketplace has an ad for a what is claimed to be a '68 427/435.
Among the ad's various photos are these two showing engine pad and casting numbers.
Do they support the seller's claim?

68ACADIAN

It does come back as a '68 427/425hp SHP. No tranny designation though. I thought "S" was the Corvette designation in the vin not an "R". I could be wrong........

derekderek

it says 427 425 hp SHP put in a car in arlington TX?

kwtx66

I, too, was confused by the R (and the sequence number), but then my decoding skills are novice-level compared to others on CF.

stingr69

427/425 Manual Transmission, Passenger Car.
Not a Corvette engine. Probably was in an Impala SS or something. 1 of 568 produced so it would be pretty rare.

kwtx66

Wow, great catch, Stingr69. Here's a screen grab from the Hemmings website that backs up your 1 of 568 reference and also explains the "ID" stamping.

lars

The engine is a 1966 425-horse 427 used in passenger cars with a manual transmission. It is not a Vette engine or a 435-horse as advertised. A rare engine, but not what they proclaim.

Lars

kwtx66

Lars:

Correct about use on '66 full sized cars as RPO L72, per another Hemmings article [https://www.hemmings.com/stories/art...olet-biscayne]

"Simply put, though the L72 could be ordered in any big Chevy--four-doors and wagons included--the Biscayne was the lightest, cheapest, and potentially quickest option. At just under $450, this 427 instantly transformed Chevy's low-cost sedate sedan into a competitive drag racer. Though model-specific figures have not been found, a total of 1,856 L72 427s were installed across the big-car line in '66.
"To verify a correct engine, a two-letter block code can be found on a pad just ahead of the passenger-side cylinder head, and is preceded by the engine plant code, "T" for Tonawanda, and build date consisting of two digits for the month and two for the day. The code for the 427/425hp L72 in a '66 full-size Chevy is "ID"; that engine is backed by a manual transmission."