Packard Forum Index » V-8 (1955-56)

While trying to find what the stock bore size is for a 320, I have came across 3 numbers. The service manual says 3.1875(3/16"), but have seen other people post that its 3.8125(13/16") and saw another one that said 3.817". I was wondering if the service manual is actually the correct number. Thanks.

Sounds like you might be confused by 2 entirely different engines, both of which happen to displace 320 cubic inches. The prewar in-line Eight 320 used thru 1939 has a bore of 3-3/16 inch. The 320 of the postwar V8 era has a bore of 3-13/16.

I just bought a nice old 1955-56 Service Manual, and quickly scanning through it noticed the same error in the specifications for the 320 cu. in. V-8 - a bore specification of 3 3/16". Obviously an error. In the back of the manual the bore specification is correct at 3 13/16". I wonder how many problems this typo has cost over the years?

(o{I}o)

Excellent, thanks a lot fellas.

Interesting little lack of proof reading there. Hopefully not too much damage was done since it looks like most apparently don't read that part--I mean look how long it has been there and just now someone has mentioned it. As you said, correct specs are in the spec section and also service counselors.

Just curious--Think my manual is an early version since it has a big blank spot instead of a picture for figure 3 - longitudinal section. Is yours the second version with something in fig 3 yet still has the error?

My manual has the longitudinal section of the engine in Figure 3.

(o{I}o)