The firing order on a GMC 228 is as you listed ,,
1-5-3-6-2-4..

Scrape off the flat part of the block to the left of the distributor. There should be a number

A228xxxxxx

to tell you if it is a 228..


Bill M
53 GMC Hydra-Matic

Home Page
http://home.comcast.net/~bd97/index.html

When you argue with a fool, two fools are arguing..