The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What did you do to your truck today part IV

shp4man · 03-20-2018, 11:29 AM

I installed the new NOS distributor I got from forum member chevy2inreno on the 250 6-banger on Sunday. Checked initial timing on the old one, was set at about 8 degrees BTDC. Spec is 4 BTDC, but I've heard from old GM mechanics that timing should be advanced to just before pinging starts on regular gas with this motor.
So installed the new distributor and set initial timing at the same 8 BTDC. Drove the truck to work today- HOLY CRAP! what a difference. Way more acceleration, should have done this a long time ago, but I though the old distributor was OK.
Think I've got the Rochester B and the spark timing dialed in pretty good now.

03-20-2018, 11:29 AM	#506
shp4man Registered User Join Date: Oct 2016 Location: San Diego, CA Posts: 547	Re: What did you do to your truck today part IV I installed the new NOS distributor I got from forum member chevy2inreno on the 250 6-banger on Sunday. Checked initial timing on the old one, was set at about 8 degrees BTDC. Spec is 4 BTDC, but I've heard from old GM mechanics that timing should be advanced to just before pinging starts on regular gas with this motor. So installed the new distributor and set initial timing at the same 8 BTDC. Drove the truck to work today- HOLY CRAP! what a difference. Way more acceleration, should have done this a long time ago, but I though the old distributor was OK. Think I've got the Rochester B and the spark timing dialed in pretty good now. __________________ Everybody has to believe in something. I believe I'll have another beer.