Options
Engine Options
For those out there that do not want to play with electronic fuel injection there is an alternative.
You can install a carb on the 4.x series engines .Over the past weeks I have set up a 4.9 with a carb
and standard HEI ignition with out the use of computers or special electronics ; with the use of readily
available parts from the salvage yards.The distributor is a combination of olds internals modified to fit
the stock caddy housing simple and works great good spark and advance curve settings
To mount the carb I just made a spacer from 3/4 thick aluminum with the TBI bolt pattern on the bottom
and the carb pattern on top using a drill press 1'5/8 hole saw to cut out the throttle bores and the stock
gaskets for the pattern..
Parts needed to convert the dist to work with the carb engine conversion
Olds Dist shaft , Induction coil , Ignition Module , Module Harness these parts except
the shaft fit the Caddy housing the shaft must be cut to match the Caddy shaft length
and redrilled . .
remove the retainer pin from the gear and remove the gear from shaft
remove the shaft and set aside you need it to get the length for the olds shaft
next remove the screws and plugs from the module and secondary harness retainer screw and remove it discard them all you will use the olds parts here
next remove the screws holding the insulator onto the pickup coil and remove the pickup coil and replace it with the olds unit and reassemble including the insulator
step 9 install the olds module and harness (c) into the stock locations (a) red lines drill two new holes for the module 7/64 size then screw the module into place no need to thread the holes the bolts are self tapping (b) as you see in step 10 cut the wires of the old computer connecter wire for the caddy dist harness and insert the black plastic piece left into the opening at (b)
in 11 and 12 you can see the difference in length between (d)&(g) the olds shaft and (e)&(f) the caddy shaft
cut the olds shaft (j) 5 5/8" long then slide the shaft into the housing and put the gear on the end of it and mark the new hole location for drilling the hole size is 3/16" try to locate the hole as close to the old location as possible it only has to be close as it is now that critical since the dist can rotate to set the timing then push the pin back in and you are done install it into the engine and set the timing as you normally do with any engine that is carbed
as you can see in these fotos it is easy to make a carb adapter out of 3/4 aluminum using a drill press and a hole saw 1 5/8 " in diameter and using the original gaskets for the carb and tbi base gasket for the patterns to cut the holes
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