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Differences K20A2 versus K20Z4

7K views 1 reply 2 participants last post by  talonxracer 
#1 ·
Hi

I have a k20A2 in a Lotus elise with ITB and K-pro.
Now i think about an k20Z4 as spare for
cylinder head,
block,
gearbox
sensors (camshaft, VTEC, temeperature, etc.)
VTEc mechanism,
chain, chaintensioner
Does anybody know the real difference beside the drive-by-wire throttle body, that would be no problem for as i use ITBs anyway. especially the parts mentioned above would be

regards
Peter
 
#2 ·
The coolant flow around the cylinders and thru the head is different, make sure that you install the partition plate(coolant divertor) in the A2 block and use a Z3/4 head gasket.

A2(top) vrs Z3(bottom) head gasket, notice the pink areas showing the differences,
 
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