I have been searching SBF forums as well as damper mfgs. .
I think if I can find a machine shop that will make me a 3 bolt
spacer and I will be ok. It looks like I needed a 4 bolt damper and
I would have more spacer lengths to choose from. I have cross-
over year models on my water pump and damper it seems.
The guy at March told me to bolt up my alternator and see if
it lines up with the crank pulley or the water pump and that
would be able to tell him what I needed .
found this information on
http://www.professional-products.com .
Small Block Ford - Small block Ford (260/289/302/351/5.0L)
dampers were made in five different lengths, two different
accessory bolt patterns and with two different external
counterweights. They also had at least three different timing
pointer locations. We make two models; the 80006/90006 has
the 28.4 oz. in. counterweight and the 80007/90007 has the 50
oz. in. counterweight. Both of these dampers are made to the
early style shortest length. This will allow users to install '81 &
later 5.0L engines (w/50 oz. in. dampers) in early Mustangs or
street rods and have more clearance in the front than if they had
the stock longer damper. Our dampers also have both 3 and
4-bolt pulley patterns so either early or late pulleys can be used.
For later applications with longer dampers, we offer a series of
three inexpensive aluminum spacers (see page 37) that
accommodate these various applications. Because some of the
early three-bolt accessory pulleys piloted on a male boss and
some piloted into a female bore, we also provide (with every
damper) a special pilot adapter to accommodate either style.
Both our Ford small block dampers have three sets of timing
marks on them to accommodate the various timing pointer
locations Ford used. To the best of our knowledge, between our
two dampers and three spacers, we can fit nearly every SB Ford
engine ever made. Will not fit 1970-?77 Mercruiser.
How to Determine Which Ford Spacer To Use - Measure the
overall length of your damper from the end of the snout to the
front pulley face. If it is 3? long, no spacers are required. If it is
3.187? long, you can modify spacer #81006 to work. (See
instructions that come with the damper) If it is 3.375? long, use
spacer #81006. If it?s 3.875? long, use spacer #81008. If it?s 4.0?
long, use spacer #81007. For additional information, see chart on
page 37.