RB vs. B on width

Posted By: The Sphinx

RB vs. B on width - 01/27/14 12:22 AM

Anyone know how much wider a 440 is than a 400 from exhaust manifold flange to exhaust manifold flange? Thanks

Posted By: RapidRobert

Re: RB vs. B on width - 01/27/14 12:53 AM

the 45 angle of the V (the decks) are on paper .745" taller on the RB so the lateral (sideways) increase would be .527" on each side. The vertical height increase would be .527" also. As you know this would vary slightly due to stackup of tolerances/head/deck milling/head gasket thickness but this number would put you pretty close to the change you would need to allow for for ex pipe changes etc

Posted By: Dodgem

Re: RB vs. B on width - 01/27/14 04:55 PM

My understanding is it's 1.9 inches.

Posted By: John_Kunkel

Re: RB vs. B on width - 01/27/14 08:54 PM

The factory Racing Manual has the following width dimensions:

Valve cover-to-valve cover: B= 22.5" RB= 23.8"

Exhaust manifold-to-exhaust manifold: B= 26.25" RB= 28.8"

Posted By: The Sphinx

Re: RB vs. B on width - 01/27/14 09:59 PM

Thanks

Posted By: RapidRobert

Re: RB vs. B on width - 01/27/14 11:12 PM

Quote:

My understanding is it's 1.9 inches.

you're right my estimate was way too low

Posted By: 440Jim

Re: RB vs. B on width - 01/28/14 03:43 AM

Quote:

Quote:

My understanding is it's 1.9 inches.

the 45 angle of the V (the decks) are on paper .745" taller on the RB so the lateral (sideways) increase would be .527" on each side.

you're right my estimate was way too low

At the top of the deck, 0.527 x 2 sides would be 1.05". The farther from the deck you get, the bigger the difference becomes. So you were likely close at the deck height. But 5-10" higher at the top of the valve cover would be way different.

Posted By: RapidRobert

Re: RB vs. B on width - 01/28/14 04:16 AM

Quote:

0.527 x 2 sides would be 1.05". The farther from the deck you get, the bigger the difference becomes.

Dead on exactly, the bore centerlines on each bank at the deck would have been 1.05 wider & further up the V the ex manifold bolt holes which is what the OP was asking about would be even farther apart than that.