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Old 06-25-2013, 10:15 AM
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how much timing advance does a stock chevy points distributor have built in?

curious how much built in vaccum advance the chevy points distributors have? bought a new reman one and put a pertronix flame thrower in it for firewall clearance reasons, i know hei ones have 20 but dont know about the points ones...

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Old 06-25-2013, 10:35 AM
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The timing advance is stamped on the vacuum advance canister mounting plate. It is usually 12 degrees on GM distributors. That is 24 degrees on the crank damper because the distributor turns 1/2 as fast as the crank.
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Old 06-25-2013, 11:38 AM
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Quote:
Originally Posted by MouseFink View Post
The timing advance is stamped on the vacuum advance canister mounting plate. It is usually 12 degrees on GM distributors. That is 24 degrees on the crank damper because the distributor turns 1/2 as fast as the crank.
The stamped number on the mounting plate is a is a ID code number. The common stamp code on 1959-1974 Chevrolet V8 engines is B1. That means the vacuum canister has a total advance of 8 degrees (16 degrees on the crank) at 16"-18" vacuum.

Typically a high performance engine with a radical camshaft that produces low manifold vacuum needs 8 degrees advance at 6"-8" Hg. That is a NAPA Echlin VC1810, GM 88924985 (discontinued), AC Delco D1312C vacuum canister..

Last edited by MouseFink; 06-25-2013 at 11:45 AM.
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