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MPG guesses just for kicks

Conversions & Swaps LSX Engines in Non-LSX Vehicles

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MPG guesses just for kicks

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Old

Dec 29, 2014 | 12:23 PM

#1

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Staging Lane

Joined: Nov 2010

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MPG guesses just for kicks

It really makes zero difference since this will be a limited-use fun vehicle, but I wondered what we might guess for MPG on the following combo.

6.0L LQ9 shortblock.
243 fully CNC ported AI heads.
234/240 - 113 cam, .626" valve lift
11.35:1 compression, .035" quench distance
Tuned factory ECM.

Car:
67 Lemans. (3250-ish weight)
T56 trans, 4.11 gears (2.05 final drive), 25.7" tires = 1800 RPM at 68 mph

I'm guessing 18 mpg, but I have very little experience with LS engines.

Old

Dec 29, 2014 | 01:41 PM

#2

Project GatTagO

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From: Little Austin

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If it is tuned right, with a fairly lean cruise (15-15.5AFR) and you keep it at 70MPH or below, you will hit over 20 mpg.

Andrew

Old

Dec 29, 2014 | 08:08 PM

#3

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Staging Lane

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Hmm... better than I thought.

Now I just have to get past the distasteful idea of putting a Chevy LS in a 67 LeMans.

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