Big Block Exhaust Manifold Numbers ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ZEKE68 · 02-19-2018, 03:45 PM

Can anyone tell me what the part numbers for the original 1968 to 1972 big block exhaust manifolds were? Bought a set of 3994045N and 3994046N but the only info I can find says they are for 1973 to 1975 police 454. Tring to get parts to put an exhaust system together but I am afraid the parts won't match these manifolds.

**70STOVEBOLT** · 02-19-2018, 10:13 PM

Those will fit our trucks. My ‘71 402 has the 4046 on the right side but it had one on the left side that had the smog holes.

02-19-2018, 03:45 PM	#1
ZEKE68 Registered User Join Date: Jul 2012 Location: Space Coast, Florida Posts: 403	Big Block Exhaust Manifold Numbers ? Can anyone tell me what the part numbers for the original 1968 to 1972 big block exhaust manifolds were? Bought a set of 3994045N and 3994046N but the only info I can find says they are for 1973 to 1975 police 454. Tring to get parts to put an exhaust system together but I am afraid the parts won't match these manifolds. __________________ 1968 SWB Step Side, Big Block, 4L80E , Running!

02-19-2018, 10:13 PM	#2
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,424	Re: Big Block Exhaust Manifold Numbers ? Those will fit our trucks. My ‘71 402 has the 4046 on the right side but it had one on the left side that had the smog holes. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear



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