Piston Skirt Diameter and Bore Clearance - ZR-1 Net Registry Forums

tnova · 05-07-2017

I'm in the middle of overhauling my 160,000 mile '91 #1773. The engine is surprising clean inside with no damage, just stretched chains, worn chain guides, bearing worn (to the copper on 1/2) but not scratches, and a third of the lifters pitted. Only three of the liners have just barely fingernail catching scratches. All liners are +0.004" - +0.007" over stock 3.897" I'm looking to replace them. As for pistons, all are good so far but I haven't mic'd piston skirts or the pins/pins bores.

What I'm looking for is the piston skirt specs. I've searched the previous forums for days (thanks for the step-by-step on rebuild) but I can't find that dimension. Does anyone have the piston diameter at the skirt specification.

Keeping the bottom stock to pass CA smog. GVD has the heads, IH, and IP for porting.

Tnova
'91 ZR1 #1773
'72 Nova
'76 Porsche PCA CC13/POC GT3

05-07-2017	#1
tnova Join Date: Oct 2013 Location: Spokane Valley, WA Posts: 115	Piston Skirt Diameter and Bore Clearance I'm in the middle of overhauling my 160,000 mile '91 #1773. The engine is surprising clean inside with no damage, just stretched chains, worn chain guides, bearing worn (to the copper on 1/2) but not scratches, and a third of the lifters pitted. Only three of the liners have just barely fingernail catching scratches. All liners are +0.004" - +0.007" over stock 3.897" I'm looking to replace them. As for pistons, all are good so far but I haven't mic'd piston skirts or the pins/pins bores. What I'm looking for is the piston skirt specs. I've searched the previous forums for days (thanks for the step-by-step on rebuild) but I can't find that dimension. Does anyone have the piston diameter at the skirt specification. Keeping the bottom stock to pass CA smog. GVD has the heads, IH, and IP for porting. Tnova '91 ZR1 #1773 '72 Nova '76 Porsche PCA CC13/POC GT3