400 Engine Ignition Wires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 08-18-2022, 02:44 PM

Does anyone have a bone stock 400 engine in a C10 that still has the ignition wires routed as they were from factory and if so could you post some pics.

**Corts60** · 08-19-2022, 12:07 PM

Can’t imagine they would’ve routed the wires any differently on the 400 than any other small block. So as long as you get some factory photos of other engines from that era you should be goos

**Already Gone** · 08-19-2022, 06:04 PM

Quote:

Originally Posted by Corts60

Can’t imagine they would’ve routed the wires any differently on the 400 than any other small block. So as long as you get some factory photos of other engines from that era you should be goos

The reason I asked is because the 400 small block I had rebuilt to replace the 350 in my 72 is missing a couple of spots to attach the wire looms that are on the 350 so was wondrig how they routed the wires from the factory without the spots to attach the loom brackets.

ray_mcavoy · 08-19-2022, 08:24 PM

In 73 GM truck small blocks changed from ram's horn to log style exhaust manifolds. So the plug wire routing is considerably different for 72 & earlier vs. 73 & later.

Cars with small block Chevys changed over even earlier (in 68 I believe). So I don't think there were any small block 400's that were factory equipped with the ram's horn style manifolds. With that in mind, you'll probably have to get creative with attaching the wire looms ... possibly making some homemade adapters that will allow them to attach to some other nearby bolt.

**Already Gone** · 08-19-2022, 09:29 PM

Quote:

Originally Posted by ray_mcavoy

In 73 GM truck small blocks changed from ram's horn to log style exhaust manifolds. So the plug wire routing is considerably different for 72 & earlier vs. 73 & later.

Cars with small block Chevys changed over even earlier (in 68 I believe). So I don't think there were any small block 400's that were factory equipped with the ram's horn style manifolds. With that in mind, you'll probably have to get creative with attaching the wire looms ... possibly making some homemade adapters that will allow them to attach to some other nearby bolt.

That's probably the issue as we did use rams horns on the 400. Okay, i guess time to get creative. I bought a whole new set of looms and 2 wont fit. Thanks

08-18-2022, 02:44 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	400 Engine Ignition Wires Does anyone have a bone stock 400 engine in a C10 that still has the ignition wires routed as they were from factory and if so could you post some pics. __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

08-19-2022, 12:07 PM	#2
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: 400 Engine Ignition Wires Can’t imagine they would’ve routed the wires any differently on the 400 than any other small block. So as long as you get some factory photos of other engines from that era you should be goos __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

08-19-2022, 08:24 PM	#4
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: 400 Engine Ignition Wires In 73 GM truck small blocks changed from ram's horn to log style exhaust manifolds. So the plug wire routing is considerably different for 72 & earlier vs. 73 & later. Cars with small block Chevys changed over even earlier (in 68 I believe). So I don't think there were any small block 400's that were factory equipped with the ram's horn style manifolds. With that in mind, you'll probably have to get creative with attaching the wire looms ... possibly making some homemade adapters that will allow them to attach to some other nearby bolt.

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