[DeTomaso] 351C Crankshaft Question

[Ken Green]

I'm trying to make sure I have this straight.  I called Fontana, and what they described was a 0.158 ring that fits behind the timing gear to space the timing gear out to correctly align the crank gear with the cam gear.  But when I told them I was using a Yates belt drive on a Bryant Nascar crank, they said I didn't need the spacer.  I ended up concluding that I need to mock up everything and see if the gear are aligned, or off by a little over 1/8 inch.  All of this assumes that the timing gear seats against the step on the snout, and the damper seats against the timing gear, is that correct?

I also am wondering about where the end of the snout is relative to the step inside the damper bore.  I pulled the damper on, and the end of the snout is lined up with the step inside the damper, which seems good for tightening.  If I have to use a spacer, then the end of the crank snout will sit 0.158 behind the step, and when I tightened the damper bolt, it seems like it may warp the washer under it?

Ken


--- On Thu, 7/17/08, Daniel C Jones <daniel.c.jones2 at gmail.com> wrote:

> From: Daniel C Jones <daniel.c.jones2 at gmail.com>
> Subject: Re: [DeTomaso] 351C Crankshaft Question
> To: detomaso at realbig.com
> Date: Thursday, July 17, 2008, 2:29 PM
> > Does anyone know if this is a correct 351C crankshaft,
> or is it one of those
> > Windsor cranks that's been machined to fit a
> Cleveland, but require some kind
> > of spacer arrangement to mount the dampener?
> 
> It requires the snout spacer.  More importantly it is
> designed for 6" rods
> so you won't have to turn the OD down to clear the
> piston skirts.  Many
> of the Windsor with 351C main cranks are designed for
> 6.2" rods and
> when used in a 9.2" deck block with 6" rods,
> there is a piston skirt
> clearance issue which requires the crank OD be reduced
> which then upsets
> the balance requiring expensive Mallory metal and labor.
> 
> The SCAT 9000 series cast crank is the only one that
> I'm aware of
> that uses a true 351C snout and does not require a spacer. 
> The rest
> of the SCAT forged steel cranks don't have the OD
> problem but they
> do require the spacer.
> 
> Carrillo (via their K1 subsidary) is making 351C main
> forged steel cranks
> in 3.5", 3.75" and 3.9" strokes.  They are
> designed for 6.125" rods and
> internal balance (the Eagle and SCAT cranks are 28.2 oz-in
> external).
> They do require the snout spacer and are $729 from
> flatlander last I
> checked.
> 
> Dan Jones
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at
> http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso