Why the Spark Plug and Timing Adv. Change from '68 to '69?
- Thread starter grantclev
- Start date
68-69 engines oil the rockers by weeping through the shafts.
newer Buick 350s use the 'normal Chevy' method of pumping oil up to the rockers through the pushrods.
if you can find the two digit Engine Code, that will tell you the year and spec of the original application.
https://www.teambuick.com/reference/ident_engine_where.php
newer Buick 350s use the 'normal Chevy' method of pumping oil up to the rockers through the pushrods.
if you can find the two digit Engine Code, that will tell you the year and spec of the original application.
https://www.teambuick.com/reference/ident_engine_where.php
None of the stock specs apply then, ESPECIALLY ignition timing. Lots of confusion out there about ignition timing. Most Buick distributors are set up so that at WOT, total advance is 30-34*. The 69 distributor had 30-34* of mechanical advance. That is why it is initially timed at 0* (TDC). Being that you are dealing with an engine and car that is 40 + years old, it is likely the distributor has been changed at some point. That means you should set the total advance.
Looks like our Tuneup Specs need correction. Those 68 350 numbers are carried over from a 67 430. Shop manual gives a 45TS plug and 0 deg TDC timing for the 68 350. Also in there is a description of the Controlled Combustion System. A blurb describes how emissions are reduced by retarding the idle advance to TDC.
If you could post the part number of the distributor we could tell more about what we're working with.
If you could post the part number of the distributor we could tell more about what we're working with.