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Thread: 340 engine build

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    Aspen and Volare Senior Member klb6469's Avatar
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    340 engine build

    Got a nice 1971 340 block, stock bore. Pair of 1969 X heads and just purchased a Edelbrock STR-12 cross ram intake manifold. What configurations would you throw at it to give it horsepower/ durability? Let me know what you think. Just a thought, it has to be able to make enough vacuum to run power brakes.

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    Aspen and Volare Senior Member klb6469's Avatar
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    I bought this intake manifold, so my build will be done around this intakeClick image for larger version. 

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    Super Moderator 77rr2x4s's Avatar
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    Wow! looks new. Cool intake. Love to see how it works out for you.

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    Aspen and Volare Super Member Stalkervette's Avatar
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    Awesome intake.

    The cost would be too high, but I wonder how a pair of self tuning FI carbs would do?????? Or if that would even work.

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    Aspen and Volare Super Moderator aspen79's Avatar
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    I recall seeing a self tuning EFI that used two throttle bodies,,,,,,,,,,,somewhere. Just for the heck of it, I'm going to see if I can find it, if for nothing more than a "if money was no object" thing.

    Found it. The one I saw is made by Fi-Tech and uses dual 4 brl/ 4 injector throttle bodies with one ECU. For some reason I can't get the link to "take". Guess it isn't THAT expensive but it's also not budget friendly either (depending on your income level, lol). Summit has it listed for $1,800 without the fuel supply system. I see they make a 6 pack version also with three 2 brl throttle bodies. That'd be different.
    Last edited by aspen79; 02-25-2021 at 07:18 PM.
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
    1996 Dakota with a torque monster (not) 3.9L V-6 and automatic owned since 1998. Now demoted to winter duty
    2008 Ford Mustang V6, the new summer daily driver

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    Aspen and Volare Super Moderator aspen79's Avatar
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    BTW, I tried to add a link but kept getting some strange page with a bunch of jibberish. Something about "must be on a string line bremmeric..................................." Same line about 10 times over and over. Computers are our friends, they make our lives easier.
    Last edited by aspen79; 02-25-2021 at 07:25 PM.
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
    1996 Dakota with a torque monster (not) 3.9L V-6 and automatic owned since 1998. Now demoted to winter duty
    2008 Ford Mustang V6, the new summer daily driver

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    Super Moderator 77rr2x4s's Avatar
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    Yea, i am having the same issue. Glitch?

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    Aspen and Volare Super Member Stalkervette's Avatar
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    I always had tuning issues with both my six pack and dual quad motors. They would run like a scaled cat when wide open, but would always stumble in day to day driving. I wonder if two MSD Atomic EFI carbs would work on a cross ram?

    That would be ~ $1K per carb, but would it pay off with tuneability and drivability? I need to check if they are drive by wire or linkage.

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    Aspen and Volare Super Moderator aspen79's Avatar
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    I had a buddy (unfortunately he passed a few years ago at a way to young age of 50) who could tune dual 4's and triple 2's to run like the cat's ass, be it idle, part throttle cruise, WFO or anything in between, all by "seat of the pants". He had a gift.

    To run dual throttle bodies, you also need an ECU that can control both at the same time. Two ECU's and 2 throttle bodies would tend to fight each other (in my mind anyways).
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
    1996 Dakota with a torque monster (not) 3.9L V-6 and automatic owned since 1998. Now demoted to winter duty
    2008 Ford Mustang V6, the new summer daily driver

  10. #10
    Super Moderator 77rr2x4s's Avatar
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    I had two 390 Holleys on my 360 Tunnel ram. It would purr like a kitten. IMO the worst thing is to go too large on the carbs. Never had any issues with getting enough vacuum for my power brakes.

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