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Discussion Starter · #1 ·
From confused,


I just read one of the posts about valve covers for an L79. There has to be more people out there like me that read these posts and have no clue what you guys are talking about.

What is the diff between these engines? What did they come in?............bk
 

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Here is an explanation for you. The terms that you refer to are codes which GM used to determine options on vehicles. They were referred to as regular production options, or RPOs. The terms that you are confused about......L30, L79, L78 were the RPO codes assigned to the different engine options that were available: L30 275HP 327, L34 350HP 396, L78 375HP 396, L79 325HP 327. All optional engines had a RPO code. Also, in different years the horsepower rating varied on some RPOs.
Every "non standard" item had a RPO code assigned to it, here are a few examples:
A01...Tinted Glass
C60...Air conditioning
F40...Heavy duty suspension
G80...Positraction
K30...Speed and cruise control
M20, M21, M22... 4-speed Transmission
N33...Tilt steering column
N34...Sport steering wheel
U69...AM FM radio
V31...Front bumper guards
V32...Rear bumper guards

All of these examples are for the 1967 model year.
I hope that this might help clear up some of the confusion.
Tim


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Tim
'57 210 2Dr Wagon
'67 300 Deluxe 2Dr Sedan
'72 SWB Orig 402
'81 El Camino TPI 4-speed

[This message has been edited by rpol7966 (edited 12-23-2001).]
 

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One step farther:

L79 was 350HP 327 in 65, 66, 67, 68 Corvettes, 66 and a very few 67 Nova's and Chevelles starting in 65 and going through 67. I don't know if the 327/325 in the 67 and later cars carried the designation also, but I never thought it did.

L78 the 396/375 was available in 66 - 70 Chevelles and 68 through 70 Novas and 67 through 70 Camaros (althought the 70's of all three varieties carried a .030 larger bore making them actually a 402's.),
 

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The L79 stood for a 350hp/327ci in the '65 Chevelle, '66 Chevy II and all years of Corvette application and for a 325hp/327ci engine in the '67 and '68 Chevelle applications.

The reason the L79 HP rating in Chevelle applications was lowered from 350hp to 325hp were likely more political than real. In 1966 the L79 was dropped from the Chevelle option list so as not to compete with the new SS396 model which was tied to the 396. The L79 was reinstated to the Chevelle option list in 1967 because so many people asked for it during the 1966 model year. BUT, the L79 was allowed back on the list only if it's HP rating was arbitrarily lowered to not exceed that of the entry-level 396 available in the SS396. What was the HP rating of the base 396 you ask? Why, it was 325HP. There were NO mechanical differences between the '65 and '67 Chevelle L79s so it's clear the HP drop of 25 was (to use another code) BS.

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[This message has been edited by Rich-L79 (edited 12-23-2001).]
 

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Were there ANY 350/327's in Novas in 67 or were they All rated at 325?
 

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<BLOCKQUOTE>quote:</font><HR>Originally posted by 2BlueLS6's:
Were there ANY 350/327's in Novas in 67 or were they All rated at 325?<HR></BLOCKQUOTE>

Rumor is a few '67 Chevy II L79s were made per special order. They would have been 350hp/327ci versions. The only time the HP rating was lower than 350 on the L79 was in the '67 and '68 Chevelles.
 

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As the story goes, there were 6 or 7 L79 Chevy IIs or Novas built in 1967. It's hard to tell whether it would have been advertised as a 350HP engine. As Rich stated, it probably was or would have been rated at 350HP, due to the fact that NO 396 engine was available in the Chevy II. Giving merit to this theory is the Corvette. The Vette did not have any 396 engines(only 427s), and the Vette L79 was listed at 350HP
Rich stated that the "advertised" horsepower ratings were lowered in '67 to "protect" the image of the base 396 engine. It probably was a good marketing ploy......an SS car had more "goodies" on it as part of the SS package so it probably had more profit built into it than would a Malibu with an L79.
It has also been determined that there were some '66 Chevelles produced with the L79. Supposedly the engine was released in the Chevelle in February/March 1966. I'd love to find a documented '66 L79.


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Tim
'57 210 2Dr Wagon
'67 300 Deluxe 2Dr Sedan
'72 SWB Orig 402
'81 El Camino TPI 4-speed
 
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