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-   61-63 Tempest & LeMans TECH (https://forums.maxperformanceinc.com/forums/forumdisplay.php?f=427)
-   -   '63 Tempest 326 V8 maximum overbore? (https://forums.maxperformanceinc.com/forums/showthread.php?t=833231)

elefantrider 08-18-2019 04:04 PM
'63 Tempest 326 V8 maximum overbore?
 
What is the max overbore on an original '63 326 TEMPEST one-year-only block?

elefantrider 08-19-2019 11:19 AM
Can it be sleeved to 4.062 ( std 389 bore)?

mechanickeith 08-19-2019 11:47 AM
You would have to get it sonic checked. I don't know much about the 326's. I have several 4 bangers that are at .120 over bore.

tom s 08-19-2019 12:39 PM
I don’t think you want all 8 sleeves anyway

Bill Hanlon 08-19-2019 12:57 PM
According to the 1966 Pontiac Chassis Parts Catalog, Pontiac only supplied oversize pistons for the '63 326 (actually 336) to +0.030" = 3.810". Not saying you couldn't find larger pistons elsewhere.

ponyakr 08-19-2019 04:30 PM
"You would have to get it sonic checked..."

^^^^^^^^^THIS^^^^^^^^^^^^

No matter what block you use, you must know how much meat you'll have left, after required bore/hone. Core shift & years of corrosion can reduce cylinder wall thickness on any given cylinder.

beemergary 08-19-2019 10:03 PM
Quote:
Originally Posted by ponyakr (Post 6052968)
"You would have to get it sonic checked..."

^^^^^^^^^THIS^^^^^^^^^^^^

No matter what block you use, you must know how much meat you'll have left, after required bore/hone. Core shift & years of corrosion can reduce cylinder wall thickness on any given cylinder.
I know of a 326 at .090 overbore. My 421 is .070

63Banshee 10-29-2019 08:48 PM
Had one with 350 pistons. That's .094 over.


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