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  1. #1
    Join Date
    Jul 2006
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    St, Louis, MO
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    76

    Default Single plane Buick 340 or Leyland P76 intake?

    I received a Wildcat single plane intake manifold in exchange for some
    consulting work on a Rover engine. The intake was supposed to fit a
    Rover block and I assumed it would be similar to the Willpower I have.
    It is not. While it looks similar, it is taller than my Willpower and
    a fair bit wider than the Buick 300 aluminum intake I have and the ports
    are larger. It has the port spacing of a Rover V8 and Buick215/300/340.
    Does anyone have access to a Buick 340 intake they could measure for me?
    As a start I'd like the port height and width and the distance between
    the left and right side bolt holes. I'm trying to identify what this
    is before I offer it up for sale. I'm told the cast iron 66-67 Buick
    340 V8 4bbl intake is similar in width to the Australian P76 intake with
    the P76 intake slightly narrower. I'm wondering if this intake fits
    one or both of those two engines. It's a shame it doesn't fit the Rover
    as it looks to be a really nice intake. I've included a couple of photos
    which show the width difference compared to a Buick 300 4 barrel intake.

    Dan Jones

  2. #2
    Join Date
    Feb 2002
    Location
    Cincinnati
    Posts
    2,842

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    I don't think that single plane fits a Buick engine (unless it is for the nail head). It sure would offer a lot of ventilation out of the top of the valley though...
    "Usually you can find me on the BPG site "
    BPG 1328

  3. #3
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    13,480

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Here is the info for the bolt distances:

    http://www.v8buick.com/showthread.ph...hlight=340+p76
    __________________________________________________ ________________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ __________________________________________________ _________________________________
    1970 Buick Skylark 350 street/strip with 6 point cage: Custom tube headers feed Twin T3/T4 Turbochargers, Holley 650, sheet metal single plane intake, heavily ported iron heads with oversized valves, mild Poston 114 camshaft (2800-6000 RPM), Diamond forged pistons on Hershe forged rods, balanced, ARP everywhere, dual 3" exhaust, Paddle shifted 4L80E 4 speed overdrive, Moser 12 bolt with 3.42 gear.

  4. #4
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    13,480

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    __________________________________________________ ________________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ __________________________________________________ _________________________________
    1970 Buick Skylark 350 street/strip with 6 point cage: Custom tube headers feed Twin T3/T4 Turbochargers, Holley 650, sheet metal single plane intake, heavily ported iron heads with oversized valves, mild Poston 114 camshaft (2800-6000 RPM), Diamond forged pistons on Hershe forged rods, balanced, ARP everywhere, dual 3" exhaust, Paddle shifted 4L80E 4 speed overdrive, Moser 12 bolt with 3.42 gear.

  5. #5
    Join Date
    Jul 2006
    Location
    St, Louis, MO
    Posts
    76

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    > Here is the info for the bolt distances:

    Measuring a few intakes that were handy across the front 2 bolt holes (inside to outside):
    Buick 215 (Edelbrock Performer Rover dual plane) 8 7/8"
    Buick 300 dual plane 9 3/8"
    Willpower single plane 10 1/4"

    Jim Blackwood measured a 340 @ 10 3/8", so the Wildcat should be a good fit
    on that block. It would need a slight milling or perhaps thin gaskets to fit
    a Leyland P76. The lips are 5/8" think on each side so it might mill down to
    fit a Buick 300 block, though you'd probably have to slot the bolt holes.

    > I don't think that single plane fits a Buick engine

    The Buick 215 uses the manifold gasket to seal the valley. For other blocks,
    you'd want to make a valley cover.

    > (unless it is for the nail head).

    It's definately not for a nail head. I've got a complete 322 Buick and a couple
    of intakes (a second 322 4 barrel and a 364 tri-power) to sell, along with several
    Buick V6 intakes (Buick 4.1L, Weiand and Kenne Bell).

    > P76 manifold valley width is 8 1/4"
    > Buick 300 valley is 7 1/2"
    > Rover V8 valley is 7"

    I get the same measurements. The Wildcat intake measures 8 1/4".

    > i'd be interested in it when it goes up for sale. i have been looking online
    > for a single plane option to modify for a 300 and a 340.

    If the dimensions above work for you, the port size is 0.95" wide by 1.925" tall.

    Thanks!
    Dan Jones

  6. #6
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    Jul 2006
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    > Dan, i will send you a pm tomorrow regarding the intake. Bob

    Sorry for the delay in responding. I lost my 'net connection yesterday. Seems to be working again.

    Dan Jones

  7. #7
    Join Date
    Feb 2002
    Posts
    287

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    It's for a P76 Dan.

    Pic 1: Stock 340 intake next to an Austrailian Wilpower P76 intake with adapter plates.

    Pic 2: Stock 340 intake next to Australian Wilpower P76 intake with no adapter plates. Pretty close but needs help.

    Pic 3: Stock 340 intake next to Australian Wilpower P76 intake with adapter plates.

    Pic 4: Stock 64 300 intake gasket on the P76 intake port.

    http://www.v8buick.com/attachment.ph...8&d=1170341777

    http://www.v8buick.com/attachment.ph...9&d=1170341777

    http://www.v8buick.com/attachment.ph...0&d=1170341777

    http://www.v8buick.com/attachment.ph...4&d=1170342067

    But, you say the port sizes are larger than the Rover? Is that right?



    Greg

  8. #8
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    Jul 2006
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Yes, the ports are a little larger than a Buick 300 aluminum head.
    I was simply going to weld the port floor (or roof) slightly to port
    match until I realized it was the wrong width.

    Dan Jones

  9. #9
    Join Date
    Feb 2002
    Posts
    287

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Quote Originally Posted by Dan Jones View Post
    Yes, the ports are a little larger than a Buick 300 aluminum head.
    I was simply going to weld the port floor (or roof) slightly to port
    match until I realized it was the wrong width.

    Dan Jones
    Well, that's news. Could it be Wildcat (or Wilpower) is making intakes to match their big valve heads? You got a pic of the ports?

    Greg

  10. #10
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Perhaps it was cast to fit Wildcat heads on a P76 block. I'll post pictures of the ports tomorrow.

    Greg, why do you need spacers on the P76 intake? Are you not using a P76 block?

    Dan Jones

  11. #11
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    >
    Greg, why do you need spacers on the P76 intake? Are you not using a P76 block?

    Is that a Rover Willpower with spacers so it fits a P76 block or ?

    Dan Jones

  12. #12
    Join Date
    Feb 2002
    Posts
    287

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    The intake I have is a Wilpower for a P76. You don't need spacers to fit a P76 intake to a P76 block, but, you DO need spacers to fit a P76 intake to a Buick 340 block (which is what I was demonstrating). You also need spacers to fit a Buick 300 intake to a P76 block. Anyway, if Wilpower casts P76 intakes for Wildcat heads, then, it's a short jump to using TA Buick\Rover heads on a 340 block with a good single plane.

    Greg

  13. #13
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    > I'll post pictures of the ports tomorrow.

    Here's a shot of the Wildcat ports.

    > you DO need spacers to fit a P76 intake to a Buick 340 block

    I see now.

    Dan Jones
    Attached Images Attached Images

  14. #14
    Join Date
    Jan 2007
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    1,274

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    I think somebody on this board had contacted Willpower about a year ago about casting a P76 intake to fit a 340 and the response was favorable, since it only meant a bit thicker mounting flange. If anyone is willing to plunk down the cash for the TA heads I'd think they would want to go that route rather than mess with spacers. Add the Sanderson headers and you have the full package.

    JB

  15. #15
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    Feb 2002
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    287

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Well, Jim there's more to it than making the mounting flange thicker. The ports have to be enlarged by a good bit. Porting the current size won't work without some major welding. Pic is a stock P76 single plane intake port compared to a stock Buick 340 port. WAY bigger. If Wilpower is casting the ports larger now, bonus....

    Anyway, you gents made me go out to the garage, dig through my stash with an el cheapo plastic ruler and get some off the cuff measurements. The are as follows:

    Stock 65 Buick 300 intake port - 2" X 1 1/16"
    Stock P76 intake port - 1 11/16" X 1"
    Ported P76 intake port - 1 13/16" X 1 1 1/16"
    Stock 64 Buick 300 intake port - 1 3/4" X 1 1/32"

    Very off the cuff.

    Greg
    Attached Images Attached Images

  16. #16
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    Jan 2007
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    You're right Greg, that was the part I'd forgotten. I don't remember if they'd discussed enlarging the runners or not. Maybe once the TA heads are available they would consider it? That package would sit very nicely atop a 350 block.

    JB

  17. #17
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    Feb 2002
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    287

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    This may be of some interest:

    http://carl.outerlimits4x4.com/viewtopic.php?t=110456

    Could be, this technique could be viable to what is already available. The adapter plate could be ported out to Buick 340 size.

    Greg

  18. #18
    Join Date
    Jan 2007
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    1,274

    Default Re: Single plane Buick 340 or Leyland P76 intake?

    Great video. Probably could put injector ports in the plate too if wanted.

    JB

  19. #19
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    St, Louis, MO
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    > those port dimensions are very close to the stock measurements i get on my 65 300 intake. please send me a pm with your asking price. Bob

    Bob, I replied to your PM. Did you see it. Please let me know if you're interested.

    Thanks,
    Dan Jones

  20. #20
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    > please send me an email or pm to let me know when the intake is enroute.

    Bob,

    Replied via PM. Please check that I have the correct
    address. The intake is boxed up and will be shipped
    on Monday via USPS.

    Thanks,
    Dan Jones

  21. #21
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    Default Re: Single plane Buick 340 or Leyland P76 intake?

    The intake is on its way via USPS. Expected delivery date is Monday 1/31/2011. Let me know when it arrives.

    Thanks,
    Dan Jones

 

 

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