Factory cylinder bore specs for a 402? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

REPO1 · 07-08-2002, 12:15 AM

Can anyone give me the exact cylinder inside diameter for a 402BB? Also what is the min/max piston to wall clearance?

Thanks!
Reid

lukecp · 07-08-2002, 12:29 AM

Whatever the bore of a 396 is plus .030 inches.

REPO1 · 07-08-2002, 12:34 AM

OK, I found the cylinder diameter. Its 4.125"

Now I just need the min/max clearance for piston to wall.

thanks!

07-08-2002, 12:15 AM	#1
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Factory cylinder bore specs for a 402? Can anyone give me the exact cylinder inside diameter for a 402BB? Also what is the min/max piston to wall clearance? Thanks! Reid __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

07-08-2002, 12:29 AM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Whatever the bore of a 396 is plus .030 inches. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

07-08-2002, 12:34 AM	#3
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	OK, I found the cylinder diameter. Its 4.125" Now I just need the min/max clearance for piston to wall. thanks! __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)



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