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09-04-2006, 08:34 AM   #1 (permalink)
strtcar
 
Join Date: Sep 2004
Location: Chicago, IL
Posts: 1,045
Stock fuel system enough to support 350hp?

I'm looking at what needs to be done to install my 345hp crate motor into my 67 mustang. Is the stock system enought to support that hp level?
Im running a holley mechanical pump, stock lines and pickup.

Thanks

<font size=-1>[ This Message was edited by: strtcar on 9/4/06 11:23pm ]</font>
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09-04-2006, 09:32 AM   #2 (permalink)
ckelly
 
Join Date: Apr 2002
Location: Merkel, Tx
Posts: 8,759
Stock fuel system enough to support 350hp?

No, the tank pickup will likely be too small. Most of those neck down below 5/16".
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09-04-2006, 06:36 PM   #3 (permalink)
66GT289
 
Join Date: Feb 2001
Location: SoCal
Posts: 493
Stock fuel system enough to support 350hp?

Check to see if your sender has 3/8" tubing or not. I think the
change from 5/16" was made in '68 though. Tubing from front
to rear I believe was 5/16-inch as well, but you may have already
got that fixed by now......
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09-05-2006, 04:20 AM   #4 (permalink)
dennis111
 
Join Date: Dec 2004
Posts: 2,379
Stock fuel system enough to support 350hp?

Yep, you should upgrade your lines.

Most aftermarket fuel sender pickups are made with 3/8" tubing, at least that is the case with the 65/66's. The tubing under the car can also be upgraded to 3/8" with aftemarket sources. Best to specify the 68' style under car tubing as it has better bends and is not located next to the driveshaft (which could be a safety issue.)

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09-05-2006, 04:18 PM   #5 (permalink)
admin
 
Join Date: Dec 2001
Location: Hercules, CA
Posts: 765
Stock fuel system enough to support 350hp?

350 is the limit with 5/16" lines. As others have said a 3/8" upgrade is easy. Most companies sell a new drop in fuel tank pickup in 3/8", and you could route 3/8" line.
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09-05-2006, 07:26 PM   #6 (permalink)
pbrown
 
Join Date: Apr 2003
Location: Seattle, WA
Posts: 673
Stock fuel system enough to support 350hp?

Just a thought but Mustangs Plus (name for now) sells a EFI fuel sender with a 3/8" outlet and return. The return can be capped and clamped for a future EFI upgrade.


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09-06-2006, 05:24 AM   #7 (permalink)
Mikes66
 
Join Date: May 2006
Location: Salem, Mass
Posts: 1,627
Stock fuel system enough to support 350hp?

I got an aftermarket replacement tank for my 66, and it was set up with 3/8 inside and out.
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