At least I have got a good lead. Thanks!

This has been a good discussion for me as I am also in the process of building a blown Y-Block with a VS-57 that John Erb in Carson City, NV is currently working on. I talked to him about the need for an electric fuel pump and pressure regulator and he never uses them. Instead, he uses a boost referenced, high volume mechanical fuel pump and taps a vacuum port into the top part of the mechanical pump above the diaphram with the vacuum line going to the blower bonnet. Depending on the boost pressure, the pump produces more or less flow (I believe). This is a confusing topic for me and I am open to either method to keep fuel flowing when you have your foot in it so you don't starve the motor. John also suggests a 1/2" fuel line between the pump and the carb and at least a 3/8" fuel line from the tank to the pump.

Rono

Interesting. John Erb is held in high esteem...he's got to know what he is doing. One of the things I have seen in the VS57 manuals is to boost reference the stock mechanical fuel pump and then add an electrical fuel pump that would kick in when you go into high boost. Is John going to put a different pulley on the blower, deleting the hi boost solenoid? And...what carb do you plan to use? If you use something that is current aftermarket, then I am sure that you wouldn't have to worry too much about how much fuel pressure that your carb is going to see. I wonder about the teapot and the most you could give that needle and seat when it comes to fuel pressure? That's one of the reasons I am considering going with an electric fuel pump full time and boost referencing the regulator to let more fuel flow when needed. What mechanical fuel pump do you plan to use? In the other 292 that I did that has a B manifold and 500cfm Edelbrock carb, I installed an FE fuel pump on that one with a 3/8" line. No issues there and it flows very well.

But then again, this blown stuff is new territory to me just like it is to you...

Have you selected a cam yet??

John Erb is going to use a solid pulley on my VS-57 unit and eliminate the selenoid. The fuel pump I will be using is an Edelbrock for the 390, 427,428 FE big block with 3/8" inlet and outlet I bought it through Summit Racing. As far as carbs go, I struggled with this because John actually prefers to use a carb enclosure. After looking into the options for a carb enclosure, I decided not to use one. Instead, I think I am leaning towards the Barry Grant Mighty Demon. We haven't chosen the specific model (there are a bunch), but it will probably be one of the "Blow Through" models and John is leaning towards an 850 CFM model. I know that seems very large, but he explained the dymanics to me while I was there visiting with him. I can't reiterate what he told me, but he is convinced that we will need to go with a carb this size. I did get a cam from John Harding ("oldmics") which is an Isky blower grind cam (#S903) 234 degree @ .050 lifter rise. Valve lift is .435 with a 110 degree lobe seperation. I still don't have the McCulloch blower bracket for the Y-Block, but John does have lots of old parts at his place and one may turn up. He also has the actual drawings to make one which he may also do. While I was there, we compared the mounting hole location between the VR and VS models (he had both) and there is a difference. This is why I've held off in buying one of F-Code blower brackets.

Rono.