LUVTruck.com

Looking through several manuals it looks like the G180, G200, 4ZD1 & 4ZE1 all have the essentially the same overall valve length and shaft diameter, the valve head diameter just gets progressively larger as the series gets newer. I know you can retrofit the G200 valves & seats into a G180 head and the 2.6 into the 2.3 head, but can you go even farther? Is there enough metal to put the 2.3 or even the 2.6 valves & seats into an early head? You could increase the air flow substantially if it were possible.

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'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78.
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.

this might be a question for the guys at ozgemini.com,I'm interested if this would work as I am wanting to max out my g180 rather than doing an engine swap.

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76 mikado project,mean green