Hey Members,
I would like to fit my Lt1 with the proper fuel filter. I am currently using a universal in-line type, but I am not sure I am getting the
correct fuel flow. I can locate a stock filter from the local parts store, but it
has a special inlet which looks like a female flare connection for the fuel line.
I am currently using just rubber hose connections. What is the proper hard
line connection at this end? Thanks.

 

Why not check the fuel pressure under full engine load, to determine if the fuel flow is adequate?

The inlet to the stock filter is a GM "quick-connect". The filter will come with a plastic pinch clip that is required to hold the end of the stock black nylon line in the filter. Right column on Shoebox's guide:

http://shbox.com/1/quick_connect.jpg

Outlet of the stock filter will have a threaded connection to the stock metal hard line.

 

4th Gen LT1 F-body Fuel Filter Replacement

 

I don't have the stock metal hard line with that male fitting. All I have is the stock metal line with a rubber hose connection. Do you know what the correct size fitting is for the stock hard line?

 

Since you're working with a non-stock chassis, I would consider using -AN fittings with braided SS lines. I have a fully braided SS fuel system, with an SX Billet fuel filter, good for 1,000 HP, in the stock position. -6AN line is more than adequate.