Fuel pump pushrod hybrid

T

trucker1

Junior Member
Could someone help? I'm using a Thickston PM 7 intake made for a 32 to 48 but bolting it to a 53 8BA engine. Could someone suggest the correct length to shorten the later pushrod? Thanks, Glynn.
 
Please don't use the word Hybred on this forum, makes me think of them damn foreign bunny hugger cars, and gets my blood pressure up.:)
 
Flatjack, would that not depend on whether or not the PM-7's fuel pump stand (as in the stand on the manifold, not the one the pump bolts to) is the same height as an original manifold?

I know that my Edelbrock Super Dual is different to the height of my original '37 aluminium manifold.
 
This post reminds me of an old trick I was shown years ago in an effort to improve the output of a weak old fuel pump on a well worn flathead engine. We would cut a small piece of leather to fit inside the cup on the fuel pump actuating lever. In effect it gave a little longer stroke to the push rod and increased the fuel pump output. That was the theory anyway.
 
28A said:
Flatjack, would that not depend on whether or not the PM-7's fuel pump stand (as in the stand on the manifold, not the one the pump bolts to) is the same height as an original manifold?

I know that my Edelbrock Super Dual is different to the height of my original '37 aluminium manifold.
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The PM-7 would be the same as the cast iron manifold which is taller than the aluminum manifold. I think the rod is 8 7/8's in. long. I would have to double check, but maybe someone else will chime in.
 
There were only 2 lengths of common pushrod for the early engines...if the back of the manifold is somewhere near 1" high, you want the short one, if circa 2" you want the long. The stock 8ba manifold is the same height at FP stand flange as early long pushrod ones, by the way. I believe you can drive a '48 type pushrod bushing right into the '49-53 one and have an instant conversion to early pushrod. I have never done that myself and currently can't find my spare bushings to check, but I guy I suggested it to said that it worked well.
 
Thanks Bruce, It looks like the 8 and 7/8 inch is the length I need to make it. This site sure is awesome. Glynn
 
Hey Bruce, does the early bushing press directly inside the late one or do you have to remove the late bushing? Glynn.
 
I have never made that adaptation...I mostly mess with 99's and 59's...but I have been told that it is an exact fit with nothing more than light tapping to insert. I suggested the route to someone on the HAMB, and he confirmed that it worked and was easy, so I cautiously believe it is so. My spare bushing is hiding somewhere, so I can't easily checkitout myself, but with a couple bucks and 5 minutes you'll know! Please report back!
(edit,early bushing goes into the late bushing. Cannot remember the numbers, except that ID of early is 3/8 and that late pushrod is a good deal fatter than that.)
 
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