1. mikesduster

    mikesduster Well-Known Member

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    i KNOW this topic has been hashed,hashed and RE-HASHED but i was thinking of something today while i was in the garage.
    i have a 340,hyd cam,11:1 comp.,x-heads,S/P M-1 and a 750 dp with a PROFORM body...i also run a 2" 4-hole NON TAPPERED spacer and was thinking,could that be causing my missing/leaning on top end??
    too much of a spacer??
    i just put on a 1" 4-hole NON TAPPERED spacer,will this help??
     
  2. AdamR

    AdamR Big Member

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    I dont think a spacer would make it miss on the top end or miss at all. The 2" 4-hole is probabbly just making a few xtra ft. lbs of torque.
     
  3. BARRACUDA340S

    BARRACUDA340S Well-Known Member

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    Mike, the 1" spacer will just move the power band down a hair. Spacers make a big difference. I ran a 1" 4 hole non tappered on the chasis dyno and then put on my 1" HVH tappered spacer and picked up 20 rwhp. The 2" is to much fo your combo. Get a 1" tappered HVH. Trust me!
     
  4. AdamR

    AdamR Big Member

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    The 1" HVH made a big differance on my car too.
     
  5. onehellofadart

    onehellofadart Well-Known Member

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    My 340 loves the 1" :thumrigh:
     
  6. 71Duster

    71Duster Well-Known Member

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    How built of a engine do you need to see any effects from a carb spacer?
     
  7. AdamR

    AdamR Big Member

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    My motor is mostly stock with a few bolt ons. Intake ,carb,headers. So it doesnt need to be really built.
     
  8. 71Duster

    71Duster Well-Known Member

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    Figure I'm in about the same stage as you then Fastback, headers, intake, carb ignition and cam pretty much. Any particular brand names you guys like?
     
  9. AdamR

    AdamR Big Member

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    Bolth Barracuda340S and I are running the HVH super sucker 1" tapered spacer.

    I picked my up on ebay for about $80 but I notice enough gain to feel it was worth the money. If you get one dont forget to use a 4-hole carb gasket on top of it.
     
  10. 71Duster

    71Duster Well-Known Member

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    Yeah gasket above and below, just have the nice cometic gasket that came with my Demon right now. How much did you have to retune after the spacer?
     
  11. AdamR

    AdamR Big Member

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    I had to go one size smaller in the metering rods of my eddy 600. I had a lean miss durring cruisen that got even worse after adding the spacer.
     
  12. cuda66273

    cuda66273 Well-Known Member

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    4 hole spacers move the tork band down in the RPM Range by increasing the venturi length and keeping the A/F mixture directional and holding the particles vaporized deeper into the manifold.

    They improve idle signal and make low end tuning easier, offering a cleaner crisper idle and better off idle throttle response.

    If you look at stock manifolds many are designed with a four hole spacer cast right into them. The top of the manifold on my 454 motorhome for example is about 1/2" thick creating a built in 4 hole spacer and increasing the low end tork of the sad Chebby POS, it manages to pull 22,000#'s down the highway at 75-80 without too much problem with the 625 Road Demon, spreadbore to square ported adaptor and one of our 1/2" spacers and a pair of our Aramid Fiber Gaskets.

    My 318 is up to 4.5" of 4 hole spacers, we started with 1" and started building at 11.83 .....after a dozen test passes and carb tuning the spacers got it down to 11.62.

    The 1 hole spacers add plennum volume for top end MPH. I run the Victor manifold and as soon as we can get back to the track I'll be adding a 2" 1 hole spacer to see if we can get it run faster than the 115.08 MPH and still maintain the low 11.60's ET.

    Rule of thumb for spacers:

    Bonneville Salt Flats...1 hole spacers
    Drag strip or towing 4 Hole

    We've also got a 1 piece 1/2" and 1" all billet 6 pack - 6 hole spacer now available and we're having the Aramid .188 (3/16) gaskets CnC'd
    to mount it. We're also working on the same spacer for the BG 6 shooter carbs, which will soon be available for Mopars. We will introduce the complete kit with hardware sometime in January.

    We also have another new product..

    4 hole spacer with a built in air bleed, very similar principle to the Demon EZ Idle Valve. It's cross drilled with a single air bleed screw to control air flow into the primary venturi to add air without over exposing the tansfer slot. It should also be available in the next 2-3 weeks.

    Visit our web site for other new products that we've worked on this winter...Racer Brown Rocker arms BB and SB in 1.5 and 1.6 combo kits, Racer Brown Cam specs and tuning guide for various cam durations, Stewart Warner Gauges, Digital Shift lights with 4 speed shift recall memory, Round all Al. fuel cells that fit in the spare tire well for Mopars, Deep sump NEW gas tanks, MSD bushing kits to get you 20-24-26* initial timing, Foam coated stainless steel engine
    gaskets NO MORE SILICONE!

    There's lots more in the catalog and tech sections www.4secondsflat.com

    We haven't been sitting around this winter....LOL
     
  13. 72Duster

    72Duster New Member

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    I have a holley 750 DP carb on a m-1 manifold (360/380 crate) what spacer do you guys recomend?? and about how much more mph would I see at in the 1/4??
     
  14. BARRACUDA340S

    BARRACUDA340S Well-Known Member

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    try the HVH 1" 4 hole tappered. You will probably see a 1/10th if you want to save a few bucks find a Mr Gasket spacer with the name super sucker. Same thing just composite material. They are around $50
     
  15. AdamR

    AdamR Big Member

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    HVH sells composites too. They are more then the aluminum though. The composite is actually better because it will help keep the fuel in the bowls colder.
     
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