Are there any physical differences between a 66 L79 and a 69 base engine distributor besides the vacuum advance.I currently have what I believe is a 69 distributor in my 66 L79 (long story)and want to do a rebuild and need to determine if repair parts are the same.
-
-
Re: C2 Distributor differences
the inards will interchange.as you note the vac advance cans differ. mike -
Re: C2 Distributor differences
Difference is internal. weights, springs, and the plate above the cam that operates the points.Bill Clupper #618Comment
-
Re: C2 Distributor differences
i'm not so sure. the degrees of distributor mechanical advance are controlled by the cam assembly [ie the oblong hole]. i did not think this was the same for every delco distributor used on vettes in the 60's, but maybe one of the experts can clarify and amplify this. in other words, are all delco vette 60's distributors built with 24 crank degrees of mechanical advance??
wernerComment
-
Re: C2 Distributor differences
No, they weren't - between the many unique autocam and weight "tail" profiles, there were umpteen different centrifugal advance maximums and maps between about 20* and 30*, plus many more variations as a result of weight spring combinations.Comment
-
Re: C2 Distributor differences
The Delco single point tach drive distributors are basically all the same and all are interchangeable, including between SBs and BBs. Same applies to the mag pulse type used with K-66 except for the BB mag pulse type that was designed for a gear drive cam. I ran a '67 L-88 TI on my '63 L-76 for several years - just installed the original drive gear, Delco 236 vacuum can,'64 SHP/FI weights and springs, and adjusted the initial timing to about 38 degrees total WOT timing. but I no longer recall the max centrifugal for the L-88 dist and what initial I ran to achieve the 38.
The differences between the various distributor part number are the vacuum advance and autocam system, including weights and springs that determine the centrifugal advance curve. The autocams are typically are set up for for a maximum of 24 to 30 degrees of crank advance. The rate and shape of the advance curve are determined by the weights and springs and shape of the cam at the top of the mainshaft. Total advance is a function of the length of the slot in the point cam.
DukeComment
-
Re: C2 Distributor differences
Duke-----
All L-88s used in PRODUCTION Corvettes were chain drive and used conventional distributor drive gear. Gear drive which required reverse pitch distributor gear was over-the-counter only. The big block TI distributor which was fitted with the reverse gear was also an over-the-counter only piece never installed on a PRODUCTION Corvette. This distributor uses a special housing which has no provisions for vacuum advance. The PRODUCTION L-88 distributor had provisions for a vacuum advance control and a vacuum advance control was installed. There was no nipple on this control for a vacuum line, though, and none was connected.In Appreciation of John HinckleyComment
-
Re: C2 Distributor differences
Back in the mid-70's we had a Chris-Craft Constellation with twin Chevy/MerCruiser 482's, one of which was reverse-rotation; if you tried to buy parts for that engine outside the "marine" world, they'd think you were out of your mindComment
Comment