Which is the leanest cylinder on a generation 1 small block chevrolet? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-14-2012, 08:03 AM
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Which is the leanest cylinder on a generation 1 small block chevrolet?

I'm going to install a wideband sensor bung in the header collector, which bank is the leanest? It will be carburated and a tunnel ram intake.
Thanks in advance.

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Old 02-14-2012, 09:56 AM
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Originally Posted by sstock
I'm going to install a wideband sensor bung in the header collector, which bank is the leanest? It will be carburated and a tunnel ram intake.
Thanks in advance.
Cylinders feeding from the lower plane of a 180 degree intake are the most problematic, of these number 7 is the worst next is number 1. Although modern intakes like the Edlebrock Performer RPM do a much better job of evening out the cylinder to cylinder variations than older aftermarket and certainly factory intakes.

Bogie
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Old 02-14-2012, 10:28 AM
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On the Z28 high rise intake it was usually #3 or #7 But it changed with each individual build! on my tunnel ram its #5 on my wifes tunnel ram its #7! If you build 2 engines identical each one could have a different lean cylinder! But its guaranteed no matter what you build one cylinder will be the leanest!! Plug reading will usually find the leanest cylinder.

Jester
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Old 02-15-2012, 07:55 AM
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Looks like the wideband sensor is going on the collector of the driver's side then.
Thanks all.
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Old 02-15-2012, 08:43 AM
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Quote:
Originally Posted by sstock
Looks like the wideband sensor is going on the collector of the driver's side then.
Thanks all.

For an oxygen sensor either side will work equally as well, I'd pick the side with the easiest access.

I'm assuming you have EFI since you're going with a wideband sensor, if you do then your fuel distribution can be nearly even across the cylinders- it depends primarily on the intake manifold.
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