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

WARP TEN · 05-08-2017

A chat with any of the experienced tuners (for example, Marc Haibeck) would probably provide a wealth of information relating to a rebuild. I know Marc, and I am sure several of the others, would be glad to talk with you. Marc's website is www.zr1specialist.com--Bob

05-08-2017	#2
WARP TEN Join Date: Apr 2007 Location: Lake Bluff, IL Posts: 2,092	Re: Piston Skirt Diameter and Bore Clearance A chat with any of the experienced tuners (for example, Marc Haibeck) would probably provide a wealth of information relating to a rebuild. I know Marc, and I am sure several of the others, would be glad to talk with you. Marc's website is www.zr1specialist.com--Bob __________________ 2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough"

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