250 manifold bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**slepysal** · 11-22-2018, 08:42 PM

Planing to swap out my long tube headers dot some cast iron shorties .
I want to get new bolts to mount them and can not find what size thread pitch they are Any help would be great! Thanks

**Wrenchbender Ret** · 11-22-2018, 10:57 PM

They are 3/8 in. bolts with coarse threads. USS. I always use grade 8 bolts with grade 8 SAE flat washers.
George

**slepysal** · 11-23-2018, 02:19 PM

thanks !!!

11-22-2018, 08:42 PM	#1
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	250 manifold bolts Planing to swap out my long tube headers dot some cast iron shorties . I want to get new bolts to mount them and can not find what size thread pitch they are Any help would be great! Thanks __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "

11-22-2018, 10:57 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: 250 manifold bolts They are 3/8 in. bolts with coarse threads. USS. I always use grade 8 bolts with grade 8 SAE flat washers. George

11-23-2018, 02:19 PM	#3
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: 250 manifold bolts thanks !!! __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "



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