1964 Chevelle Engine ID Codes

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Engine

Transmission

Notes
Code Size-Carb HP-RPO    
G 194-1 120 Manual-3  
GB 194-1 120 Manual-3 Heavy Duty Clutch
GF 194-1 120 Manual-3 P.C.V.
GG 194-1 120 Manual-3 P.C.V./Heavy Duty Clutch
GH 194-1 120 Manual-3 Taxi
GJ 194-1 120 Manual-3 P.C.V./Taxi
GK 194-1 120 Manual-3 A.C.
GL 194-1 120 Manual-3 A.C./Heavy Duty Clutch
GM 194-1 120 Manual-3 P.C.V./A.C.
GN 194-1 120 Manual-3 A.C./Heavy Duty Clutch
K 194-1 120 Powerglide  
KB 194-1 120 Powerglide P.C.V.
KC 194-1 120 Powerglide Taxi
KD 194-1 120 Powerglide P.C.V./Taxi
KH 194-1 120 Powerglide A.C.
KJ 194-1 120 Powerglide A.C./P.C.V.
230 ↓        
BL 230-1 155-L61 Powerglide  
BM 230-1 155-L61 Powerglide  
BN 230-1 155-L61 Powerglide P.C.V
BP 230-1 155-L61 Powerglide P.C.V./A.C.
LL 230-1 155-L61 Manual-3 A.C.
LM 230-1 155-L61 Manual-3 P.C.V.
LN 230-1 155-L61 Manual-3 A.C./P.C.V.
283 ↓        
J 283-2 195 Manual-3  
JA 283-2 195 Manual-4  
JD 283-2 195 Powerglide  
JG 283-4 220-L77 Powerglide  
JH 283-4 220-L77 Standard  
327 ↓        
JQ 327-4 250-L30 Standard (Available March 1964)
JR 327-4 300-L74 Standard (Available June 1964) *
JS 327-4 365-L76 Standard
Transistor Ignition ***		 **
JT 327-4 250-L30 Standard (Available March 1964)
SR 327-4 250-L30 Powerglide (Available March 1964)
SS 327-4 300-L74 Powerglide (Available June 1964) *

A total of 149,506 6-cyl engines were installed; 84,400 194cid and 65,106 230cid engines.
A total of 221,328 8-cyl engines were installed; 212,993 283cid and 8,335 327cid engines.

* One reader reports a JR coded L74 block cast May 1, 1964 and assembly date of 0513 from Flint. When the car was sold isn't known but 'availability' dates are always open to some leeway.

** This combination was supposedly built for the 1964 Chevelle but Chevrolet's Accumulative Production Report does not list the RPO as being sold in a Chevelle. It is possible there might have been a few built but not reported. There is mention of a JS coded engine in an internal memo from FACILITIES & PRODUCTION PLANNING dated March 19, 1964 of engine codes being added but no specifics on this particular engine code and this memo includes all of the Chevrolet passenger car and truck lineup.

The currently available 1964 Chevelle & El Camino Factory Assembly Instruction Manual (AIM) confuses the L76 and/or K66 transistor ignition issue a bit further. Page 250 of the AIM shows K66 with the L76 engine but the dated drawing (April 7, 1964) also shows K66 being canceled. Pages 251 through 255 show other K66 details (in particular, wiring) but no mention of the option being canceled. All-in-all, it is confusing. Whether just page 250 showing the major components was canceled or just the wiring components is questionable. I find it unlikely the wiring pages would still be valid if the option itself was canceled. And, since no L76 engine or K66 transistor ignition option was reportedly sold...until someone comes up with legitimate, documented proof of either I will leave the notations as they are.

*** It should be noted that no K66 transistorized ignition options are reported as being sold in the Chevelle lineup by Chevrolet. See 1964 Chevelle RPO Production Numbers.

There is no breakdown of engine type or size by specific series/model.

Canadian Chevelles are not broken down by specific engine size, only engine type.
A total of 13,361 6-cyl engines and a total of 5,524 8-cyl engines were installed Canadian Chevelles.