My car is an original 6cyl car if that makes a difference and I'm wondering if the line from the tank is big enough to support a 725hp motor?

 

the 396/375 came with a 3/8" line
my engine builder said I need at least a 3/8" line for my 532 horse small block.
so to answer your question ........ no

 

So i guess the next question is how hard is it to replace the stock line with a bigger one. I havent looked up under there before. Do you have to drop the tank?

 

yes drop the tank and get a new sending unit

Brand:OER
Manufacturer's Part Number: 6428845
Part Type:Fuel Tank Sending Units
Product Line:OER Fuel Tank Sending Units
Summit Racing Part Number:OER-6428845


Fuel Pump Included: No
Quantity: Sold individually.
Notes: Single 3/8 in. line. Includes lock ring and rubber gasket.
you can get one with a return line depending on your intensions
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1969 Chevrolet Camaro New Aftermarket Fuel Sending Unit - TNKFG104D


$62.07
$107.38

• Part #:TNKFG104D
• Manufacturer Part #:FG104D

Description

• Condition: New
• OE or Aftermarket: Aftermarket
• Manufacturer: Spectra Premium
• Number of Outlets: 2
• Ohms: 0-100
• Inlet Size: 1/4 inch
• Outlet Size: 3/8 inch
• Features Included: Fuel Sender, Float, and Strainer

 

What size line do you plan to run from the tank up to the motor?


I'm going to be builder a 600+ motor and I have a #10 line coming from my cell to the fuel pump and then was told to run 1/2" up to the regulator and 3/8" line to each fuel bowl.