Bore spacing, block deck ht ?

Discussion of the 331-354-392 HEMIs.

Moderators: scottm, TrWaters, 392heminut

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gary534

Bore spacing, block deck ht ?

Post by gary534 »

Would someone please tell me the early Hemi bore spacing and the block deck ht ( crank center to block deck ) of the high and low blocks ?
DblAdigger
Posts: 86
Joined: Mon Feb 02, 2004 1:40 pm
Location: SoCal

Post by DblAdigger »

Factory spec., on 392 deck is 10.870.
Chuck Stevens
Some people can break a cannon ball, in a sand box, with their bare hands.
gary534

bore spacing ?

Post by gary534 »

Would you please give me some idea as to what the early Hemi bore spacing is ? I had asked the Donovan question in hopes of shedding some light on that. Now I see the Donovan block is a different animal.
DblAdigger
Posts: 86
Joined: Mon Feb 02, 2004 1:40 pm
Location: SoCal

Post by DblAdigger »

Wrong. 392/417 share te same bore spacing.
Chuck Stevens
Some people can break a cannon ball, in a sand box, with their bare hands.
30dodgeboy
Posts: 3
Joined: Fri Dec 02, 2005 6:38 pm
Location: southeast WI

Re: bore spacing ?

Post by 30dodgeboy »

gary534 wrote:Would you please give me some idea as to what the early Hemi bore spacing is ?
I measured a 331/354 deck height at 10.384 inch (don't know tolerance range)

I am pretty sure that the bore spacing is 4.5625 inch

The Donovan should have the same bore spacing, otherwise the heads, rockershafts, cranks, cams, valve covers, etc won't interchange.
Still searching for parts for my 1930 Dodge Brothers DD coupe...
budmspeeco
Posts: 133
Joined: Tue Dec 21, 2004 5:35 pm
Location: South Houston, Texas

Bore spacing, block deck ht ?

Post by budmspeeco »

Block/deck height of a 392 is 10.870. I have not measured a 331/354 so I can't give that one. Bore spacing on a 331/354/392 are all the same. If you have any one just measure it and you shold have it for all three. I have an uncut 331 I can use to measure the deck height in a few days. Will do the spacing at the same time for verification. I will post the numbers. Buddy
'48 anglia
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