Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 11-09-2019, 10:57 AM   #1
chiefdave
Junior Member
 
chiefdave's Avatar
 
Join Date: Oct 2019
Location: Warsaw, MO
Posts: 20
Default Thanks for the advice, still need more

Thanks to everyone that replied to my previous posts. It made the intake manifold/carb and head install much easier. I'm ready to move on with more mods and am looking for more advice.


1. The Mallory dual point I have, ZC275AX, has a provision for vacuum advance. Should I use this feature or block it off and go centrifugal only?


2. Has anyone used the Mac's spin on filter conversion? Any problems?


3. The car ('49 sedan) currently has dual exhaust using the stock exhaust manifolds. Would like to upgrade with something that would not require any fitting or grinding.
chiefdave is offline   Reply With Quote
Old 11-09-2019, 12:59 PM   #2
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 5,913
Default Re: Thanks for the advice, still need more

1, By all means. Hook it to manifold vacuum.
2, Not used one.
3, Again, no experience on that model.
Mart is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 11-09-2019, 01:18 PM   #3
estout81
Senior Member
 
estout81's Avatar
 
Join Date: Jun 2010
Location: Utica, Ohio
Posts: 393
Default Re: Thanks for the advice, still need more

Use the stock filter as it does a better job of filtering.
estout81 is offline   Reply With Quote
Old 11-09-2019, 02:30 PM   #4
chiefdave
Junior Member
 
chiefdave's Avatar
 
Join Date: Oct 2019
Location: Warsaw, MO
Posts: 20
Default Re: Thanks for the advice, still need more

Quote:
Originally Posted by Mart View Post
1, By all means. Hook it to manifold vacuum.

Manifold or venturi? The manifold vacuum on the engine is 20.5"hg at idle. I think that would pull it to full advance. The Holley 390 that I'm using has a port for metered venturi vacuum that is zero at idle and increases to 10" at 1500 rpm.
chiefdave is offline   Reply With Quote
Old 11-09-2019, 02:50 PM   #5
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 5,913
Default Re: Thanks for the advice, still need more

Dunno. I'd use manifold, but maybe someone else can say if venturi would be better.
Mart is offline   Reply With Quote
Old 11-09-2019, 03:57 PM   #6
flatheadmurre
Senior Member
 
flatheadmurre's Avatar
 
Join Date: Apr 2015
Location: Sweden
Posts: 2,498
Default Re: Thanks for the advice, still need more

Thoose mallory distributors had something called a spark control valve mixed into it just to complicate things if i remember right...
Taking vacuum from intake and having venturi controlling the valve...
flatheadmurre is offline   Reply With Quote
Old 11-09-2019, 04:53 PM   #7
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 5,127
Default Re: Thanks for the advice, still need more

All of the Mallory distributors with vacuum I have seen have a "vacuum brake" like the pre-'49 Ford distributors. (Actually, it should be called a "vacuum unbrake, but that's kind of awkward). As such, I believe that it should be hooked up to manifold vacuum rather than venturi vacuum. I would try it both ways. I had a vacuum over mechanical converted SBC distributor on my '51 and couldn't get it to work right. I changed in a mechanical only Mallory flattop and am much happier with the way the car runs.
tubman is offline   Reply With Quote
Old 11-10-2019, 02:39 AM   #8
flatheadmurre
Senior Member
 
flatheadmurre's Avatar
 
Join Date: Apr 2015
Location: Sweden
Posts: 2,498
Default Re: Thanks for the advice, still need more

This is the little gadget i thought of..
https://www.ebay.com/itm/Vintage-Mal...4AAOSwteRdseDd
Think this was an option either to correct or improve the spark advance...
flatheadmurre is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 02:42 AM.