The Ford Barn

trucker1 · 11-06-2014, 04:48 PM

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.

flatjack9 · 11-06-2014, 06:31 PM

Shorten it to match the early pushrod. The pushrod is hollow and the ends are pressed in.

Ralph Moore · 11-06-2014, 10:32 PM

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.

28A · 11-07-2014, 05:10 AM

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.

RalphG · 11-07-2014, 09:26 AM

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.

flatjack9 · 11-07-2014, 09:37 AM

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Quote:

Originally Posted by 28A

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.

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.

trucker1 · 11-07-2014, 02:16 PM

Thanks for taking the time to help guys. Glynn.

Bruce Lancaster · 11-07-2014, 02:54 PM

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.

trucker1 · 11-12-2014, 08:28 AM

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

trucker1 · 11-12-2014, 08:33 AM

Hey Bruce, does the early bushing press directly inside the late one or do you have to remove the late bushing? Glynn.

Bruce Lancaster · 11-12-2014, 09:53 AM

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.)

11-06-2014, 04:48 PM	#1
trucker1 Junior Member Join Date: Jul 2012 Location: Lubbock,Tx. Posts: 22	Fuel pump pushrod hybrid 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.

11-06-2014, 06:31 PM	#2
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Fuel pump pushrod hybrid Shorten it to match the early pushrod. The pushrod is hollow and the ends are pressed in.

11-06-2014, 10:32 PM	#3
Ralph Moore Senior Member Join Date: Oct 2010 Location: North Pole, Alaska Posts: 1,470	Re: Fuel pump pushrod hybrid 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.

11-07-2014, 05:10 AM	#4
28A Member Join Date: Aug 2010 Location: Brisbane, Australia Posts: 44	Re: Fuel pump pushrod hybrid 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.

11-07-2014, 09:26 AM	#5
RalphG Senior Member Join Date: Sep 2014 Location: Sask. Canada Posts: 2,424	Re: Fuel pump pushrod hybrid 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. __________________ https://www.youtube.com/user/roosty6/videos

11-07-2014, 02:16 PM	#7
trucker1 Junior Member Join Date: Jul 2012 Location: Lubbock,Tx. Posts: 22	Re: Fuel pump pushrod hybrid Thanks for taking the time to help guys. Glynn.

11-07-2014, 02:54 PM	#8
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Fuel pump pushrod hybrid 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.

11-12-2014, 08:28 AM	#9
trucker1 Junior Member Join Date: Jul 2012 Location: Lubbock,Tx. Posts: 22	Re: Fuel pump pushrod hybrid 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

11-12-2014, 08:33 AM	#10
trucker1 Junior Member Join Date: Jul 2012 Location: Lubbock,Tx. Posts: 22	Re: Fuel pump pushrod hybrid Hey Bruce, does the early bushing press directly inside the late one or do you have to remove the late bushing? Glynn.

11-12-2014, 09:53 AM	#11
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Fuel pump pushrod hybrid 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.)