[Jason@JacFab]

By the numbers... LFX / LGX

Displacement (CID): 218ci / 222ci

Bore: 94mm / 95mm

Stroke: 85.6mm / 85.6mm *NOTE GMpowertrain.com says the stroke is 85.8mm, I believe that may be a typo*

Compression Radio: 11.5:1 / 10.2:1 *NOTE this is what the tech document says, I see 11.5:1 referenced in sever other places on the internet, I think this is a typo in the document*

Intake valve lift: .4252" / .4280" non AFM (.4331" AFM cylinder)

Exhaust valve lift: .4252" / .4418" non AFM (.4468" AFM cylinder)

Connecting Rod (bearing end): 59.620-59.636mm / 60.920-60.936mm

Connecting Rod (Pin end): 24.009-24.019mm / 23.0007-23.017mm

Connecting Rod Length (center to center): 6.000" / 5.860"

Valve face angle: 44.25 degrees / 44 degrees

Valve head diameter EXH: 1.1996-1.2098" / 1.2350-1.2453"

Valve head diameter INT: 1.5028-1.5130" / 1.5460-1.5563"

Valve Length EXT: 3.74" / 3.9583"

Valve Length INT: 3.9618" / 4.1858"

Random numbers... This really is a whole new engine... I could find very little in common with the LFX. A lot of stuff I didn't bother to type out, things like crank journal sizes, rod journal sizes, cam journal sizes, they're all different...

It seems almost nothing will cross over from the LFX or vise versa that's worth noting... Even the throttle body is different, although it is the same diameter. I was hoping the rods would be the same, but NOPE

[ussj4brolli]

Originally Posted by Jason@JacFab

By the numbers... LFX / LGX

Displacement (CID): 218ci / 222ci

Bore: 94mm / 95mm

Stroke: 85.6mm / 85.6mm *NOTE GMpowertrain.com says the stroke is 85.8mm, I believe that may be a typo*

Compression Radio: 11.5:1 / 10.2:1 *NOTE this is what the tech document says, I see 11.5:1 referenced in sever other places on the internet, I think this is a typo in the document*

Intake valve lift: .4252" / .4280" non AFM (.4331" AFM cylinder)

Exhaust valve lift: .4252" / .4418" non AFM (.4468" AFM cylinder)

Connecting Rod (bearing end): 59.620-59.636mm / 60.920-60.936mm

Connecting Rod (Pin end): 24.009-24.019mm / 23.0007-23.017mm

Connecting Rod Length (center to center): 6.000" / 5.860"

Valve face angle: 44.25 degrees / 44 degrees

Valve head diameter EXH: 1.1996-1.2098" / 1.2350-1.2453"

Valve head diameter INT: 1.5028-1.5130" / 1.5460-1.5563"

Valve Length EXT: 3.74" / 3.9583"

Valve Length INT: 3.9618" / 4.1858"

Random numbers... This really is a whole new engine... I could find very little in common with the LFX. A lot of stuff I didn't bother to type out, things like crank journal sizes, rod journal sizes, cam journal sizes, they're all different...

It seems almost nothing will cross over from the LFX or vise versa that's worth noting... Even the throttle body is different, although it is the same diameter. I was hoping the rods would be the same, but NOPE

Great information!

If that compression ratio is indeed correct... this will like boost even more the the gen5 V6s stock. We need more performance parts for this thing!!!!!