[DeTomaso] what crankshaft to get?

[Daniel C Jones]

> Scat makes a forged steel, internally balanced, crank for the cleve.

SCAT makes a series of cranks for Cleveland main blocks that can be
internally balanced.  The specific cranks that SCAT lists as "can
internally balance, may require heavy metal" are usually the cranks
that are finish machined for longer rod 9.5" deck aftermarket race
block (Windsor deck height with Cleveland main) applications.
These cranks have different bobweights than those typically included
in the Cleveland stroker kits which generally use a shorter rod due
to the shorter Cleveland deck height.  For shorter stroke cranks,
you can run the longer rod crank in a Cleveland block (with
corresponding length rods and compression height pistons).  Don't
be tempted to run the long rod part number crank with shorter rods
as you may run into piston skirt to crank throw interference.
Oddly enough, the 3.75" stroke crank that would have been included
in your 383 kit is listed as 28 oz-in only in the current catalog
and is only available in a 6" rod standard weight version.

My 4" stroke 6" rod cranks is also listed as 28 oz-in only but was
internally balanced with I-beam rods, Diamond pistons and a couple
of slugs of Mallory metal.  Heavier rods and pistons would require
more Mallory metal.  I've seen some cranks where the cost of the
Mallory metal was greater than the cost of the crank.  My other
3.85" stroke crank with 6" Oliver Superlight rods and Wiseco pistons
was externally balanced.  It required no Mallory metal.  In fact, it
required a lot of metal be removed from the cranks throws.

Back to Todd's application (3.85" stroke and 6.125" rod), the
corresponding SCAT crank is listed as "can internally balance, may
require heavy metal" so he should be safe.  Also, note there are
variations depending upon whether the crank is a standard or lighter
weight variant.

Dan Jones