L31MaxExpress
I'm Awesome
Thats a benefit of the marine intake on a SBC or 4.3L. The marine engines used the stock Vortec distributor. You can also reuse the stock throttle body. No modifications to throttle cable or cruise control cable. The stock air intake or L31 cold air intake also works. The marine MAP works. The L31 marine lid also has two bosses that can be drilled and tapped for vacuum. I used a late model TBI purge solenoid. It is electrically the same, has the same connector and has hose barbs. On a stock L31 you can use the marine injectors. The marine intake also broadens your power band without taking away low speed power; where a single plane intake or ramjet will kill off low-speed power with its shorter runners. IF a manufacturer made a decent dual plane port fuel injected intake it would actually add some low-midrange power over the cross-ram intake. I know the virtue of a dual plane PFI because I actually ran a Mercruiser one that is very similar to an Edelbrock Performer RPM.So you can get the connectors and pins from efi connection or custom connectors. I bought the Holley injector harness and repinned the connector to connect to the factory harness. And yes now the marine intakes are as much or more than an aftermarket intake. When you get injectors you have to keep in mind that gm runs there setup at 60 psi and most of the aftermarket are rated at 43.5 psi if you buy the ones rated for the lower psi and run them at the higher psi they will be to big for what you have. And that only matters if you’re using the stock computer as all the fuel tables are for the higher fuel psi. If you are going to use the stock computer you will have to provide ports for the map and evap sensors. I’m doing this on a 7400. I had to get a different distributor as the crab cap puts the plug wires right into the fuel rails and there is not a different cap option
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