B/RB Chrysler Valley Pan Bolt Pattern Dimensions

[cutta]

If anyone has this data, it would be much appreciated. I need to draw up a design. To clarify, I'm looking for the dimension for the B and RB blocks. I believe the width changes some.

[John Dinkel]

Go to an auto parts store and buy a gasket for a 383 and one for a 440. The 440 is bigger.

[GTX JOHN]

Approximately one inch difference as I remember.
10 1/4 C/L of intake bolt holes on Low Deck and
11 1/4 on High Deck in overall width on undecked
blocks.
Is that the dimension you need.........Monday I could jig
some up and give you any other Dimensions you need.
Rods are .4 to .5 longer depending on engine High Block
The valley pan hold down bolts are in the exact same place
but the straps are wider past the holes on the high block.

[GTX JOHN]

You can cut down big block high deck brackets to fit low
deck . You can fab or buy aftermarkets from 440 Source.
Be sure there is clearance for intake to heads to fit properly.

[treessavoy]

Originally Posted by GTX JOHN

You can cut down big block high deck brackets to fit low
deck . You can fab or buy aftermarkets from 440 Source.
Be sure there is clearance for intake to heads to fit properly.

John,

Doesn't Indy make their own valley pans for both blocks?

JimR

[GTX JOHN]

Yes........They are a pain to use.... at least the one piece ones.
You have to pull off a head to get it of to access the lifters
and cam. I am not sure if they fit std. heads as I have only
used them with Indy Heads.
440 Source make several different ones- also at a reasonable price as well.
I just use the stock tin ones on most application and trim
the Head area to use paper gaskets and buy Beer for a
Month on the Savings.