The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1985 big block 454, California emissions, exhaust manifold tubes, any plugs out there

tinydb84 · 01-13-2017, 01:56 PM

I thought they were NPT but could be wrong. I would take the nuts out and weld the holes shut.

01-13-2017, 01:56 PM	#5
tinydb84 Registered User Join Date: Jul 2009 Location: San Jose Ca Posts: 2,871	Re: 1985 big block 454, California emissions, exhaust manifold tubes, any plugs out t I thought they were NPT but could be wrong. I would take the nuts out and weld the holes shut. __________________ David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy