small block / big block motor (and B / RB)
Oct 8, 2011 17:26:17 GMT -5
Post by sigmfsk on Oct 8, 2011 17:26:17 GMT -5
Small block = distributor in back, upper radiator hose goes to driver side of radiator.
Big block = distributor in front, upper radiator hose goes to passenger side of radiator.
Big block Mopar could be a "B" or "RB". For 74-77 c-body Monaco purposes this means a big block motor could be
B: 400
RB: 440
RB = Raised Deck Block
An RB engine has a deck height 0.727" taller than a B engine:
www.ramchargercentral.com/engine/brb-engines-350361383400383413426w426h440/
BLOCK DECK HEIGHTS
B = 9.98"
RB/Hemi = 10.725"
We talked about how to tell the difference between the blocks:
> look at the water pump boss indicated by the arrows in blue. On
> the 400 there's just a gap behind it. On the 440, that boss goes
> back and connects to the "table". I indicate the "table" in green.
from archived info here:
www.bluesbrotherscentral.com/forum/topic/9101-selling-finland-1974-1977-monacos-royal-monacos/page__view__findpost__p__115092
As for information about 74-77 RB 440 engines (the only engines that came with the high performance orange dual snorkel air cleaner), it seems that the earlier year engines came with at least some better parts:
> a stock 1974 cop 440 has a forged crank, while a stock 1977 cop
> 440 has a cast crank (because all 77 440's had a cast crank).
from archived:
www.bluesbrotherscentral.com/forum/topic/7336-selling-1974-dodge-monaco-police-new-york/page__view__findpost__p__119598
but the actual blocks themselves were better in later years:
www.440source.com/blockinfo.htm
> For many years it was thought that late model blocks were thin
> wall and should not be bored more than .030 over.
> There is no such thing as thinwall blocks. They DO NOT exist.
>
> SOME 440's cast in '76 and later have CONSIDERABLY thicker
> main saddle supports.
>
> The thickness of the mounting lugs or "ears" was increased
> starting in 1975.
>
> The cooling passages in the deck surface were changed...In
> 440's it was first used in 1975 and continued until the end of
> production in '79. Some people like the added benefit of extra
> cooling, while others think the additional iron missing weakens
> the deck. Blocks don't commonly crack in this area, so to us the
> additional cooling seems like a good benefit.
your friend in graphical references,
arthur
Big block = distributor in front, upper radiator hose goes to passenger side of radiator.
Big block Mopar could be a "B" or "RB". For 74-77 c-body Monaco purposes this means a big block motor could be
B: 400
RB: 440
RB = Raised Deck Block
An RB engine has a deck height 0.727" taller than a B engine:
www.ramchargercentral.com/engine/brb-engines-350361383400383413426w426h440/
BLOCK DECK HEIGHTS
B = 9.98"
RB/Hemi = 10.725"
We talked about how to tell the difference between the blocks:
> look at the water pump boss indicated by the arrows in blue. On
> the 400 there's just a gap behind it. On the 440, that boss goes
> back and connects to the "table". I indicate the "table" in green.
from archived info here:
www.bluesbrotherscentral.com/forum/topic/9101-selling-finland-1974-1977-monacos-royal-monacos/page__view__findpost__p__115092
As for information about 74-77 RB 440 engines (the only engines that came with the high performance orange dual snorkel air cleaner), it seems that the earlier year engines came with at least some better parts:
> a stock 1974 cop 440 has a forged crank, while a stock 1977 cop
> 440 has a cast crank (because all 77 440's had a cast crank).
from archived:
www.bluesbrotherscentral.com/forum/topic/7336-selling-1974-dodge-monaco-police-new-york/page__view__findpost__p__119598
but the actual blocks themselves were better in later years:
www.440source.com/blockinfo.htm
> For many years it was thought that late model blocks were thin
> wall and should not be bored more than .030 over.
> There is no such thing as thinwall blocks. They DO NOT exist.
>
> SOME 440's cast in '76 and later have CONSIDERABLY thicker
> main saddle supports.
>
> The thickness of the mounting lugs or "ears" was increased
> starting in 1975.
>
> The cooling passages in the deck surface were changed...In
> 440's it was first used in 1975 and continued until the end of
> production in '79. Some people like the added benefit of extra
> cooling, while others think the additional iron missing weakens
> the deck. Blocks don't commonly crack in this area, so to us the
> additional cooling seems like a good benefit.
your friend in graphical references,
arthur
