Last year I had some significant upgrades done to my L48, 350.  Installed Edelbrock E-Street aluminum heads; Holley 770-cfm Street Avenger carb; Patriot tight-tuck headers; Comp Cam hudraulic roller cam; Cyclone-plus dual intake manifold.  CR now measures 9.7:1. 

Hey chuck is your Holley a mechanical secondary..if so you may be getting to much for the auto..
Rich

 VERY VERY pretty car, Gary!  LOVE the hood.

[QUOTE=garr72]

Joel and Rich if you check the books different pumps were used on say on the Lt1 and the base engines. One last tidbit I'm running 10.13 compression. The car is currently in storage as winter is setting into the great white north Canada and this the time we use to plan and gather the parts for next years projects. Merry Xmas to all Save the wave and thanks for all your help. Garry

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The biggest difference in the pumps is where the fittings are, and which way they point, along with whether or not the pump has a return fitting...not all did. The pumps with the longer "cans" did provide more volume, but no more pressure.

I fergot all about this thread...


Adams' Apple2011-02-14 11:15:49

No. My Holley is a vacuum operated secondary.

Hi Chuck after more research I purchaced an Edelbrock rpm pump and the bottem plate that is recommended for tight fits it moves the inlet and outlet to the bottem of the pump. Its what Edelbrock recommends for the street 110 gal/hr at 6lbs no regulator needed. The car is in storage and this will be done in a few months. I'll post the results weither good bad or inderferent. Garry

Thanks Garry for the info. 

[QUOTE=CCasey]

Last year I had some significant upgrades done to my L48, 350.  Installed Edelbrock E-Street aluminum heads; Holley 770-cfm Street Avenger carb; Patriot tight-tuck headers; Comp Cam hudraulic roller cam; Cyclone-plus dual intake manifold.  CR now measures 9.7:1. 

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Chuck I would check the mechanical advance of the distributor..I have had a bunch of HEI cars over the years that did just that..you may even get a pop up the intake at times..since everything is new I would go for tuning verse new parts now..you may need a higher volume pump but what was on there should be enough get it running ok..
Rich

As a matter of fact I was thinking of getting it dyno-tuned. Thanks for the tip.

Chuck - The 1721 Edelbrock pump is what they recommend for street use and will support engines up to 550hp. Their racing fuel pumps  are recommended for strictley racing and you need a regulator. Garry