Wedge Vs Hemi blocks - mods required?
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Thread: Wedge Vs Hemi blocks - mods required?

  1. #1
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    Wedge Vs Hemi blocks - mods required?

    Does anyone have a complete Hemi vs Wedge differences list as far as bolting on a hemi head to a wedge block? There is obvious stuff like manifolds, pushrod clearance, etc- but it the head bolt spacing different or are they just bigger in size?
    70 Duster - Keith Black 526, 2 x 830 annulars/tunnel ram, big solid roller, 727 ProTrans, Strange 4.30s<br /><br />77 440 Dodge van 12.96 @ 108 - 4800 lbs of love with a 2.72 peg leg and 1800 stall* <br /><br />74 cheyenne 452 stroker, 2x450's on a tunnel ram, 21 foot, Berkeley jet, place diverter

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  3. #2
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    Re: Wedge Vs Hemi blocks - mods required?

    A few of the bolts line up, but not all of them. You have to make some new holes and you have to grind passages for the pushrods. In some cases you have to weld tubes in place for the pushrods.
    It takes a Mopar to catch a Mopar.

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    Re: Wedge Vs Hemi blocks - mods required?

    Four of the five bolts per cylinder will work. The fifth bolt is the inboard that doesn't work. Bolt bosses need to be welded onto the valley for the fifth bolt that attaches upsidedown. You will also need to carve out notches for the exhaust pushrod to clear the block. The notch cuts into the water jacket and a partial tube is welded into place.

    This conversion isn't done anymore that I know of. With the new blocks, good wedge heads, troublesome welds, and cost of the modification it doesn't pay to convert the wedge block anymore.

    There was a guy who made Hemi heads made especially for the wedge block. It was called Stage V. I think he's since gone under. His heads required special rockers.

    Check this out.
    http://www.hotrod.com/techarticles/1...ion/index.html
    Moparteacher

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    Re: Wedge Vs Hemi blocks - mods required?

    Eric Hansens Stage V company still works, but doesn't make conversion heads anymore. It was a pricey mod, needing custom parts like pistons, and once new blocks became available there was no demand for conversion heads. It costs about the same to buy a real Hemi block and heads than the conversion heads and all parts needed. At about 650 hp you start experiencing problems with the wedge short blocks, and you can get yourself in to trouble even with factory iron heads. So, it doesn't make a lot of sence to install heads with 800+ hp theoretical power. capability on to a stock block.

  6. #5
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    Re: Wedge Vs Hemi blocks - mods required?

    * I stiil want to do a Stage V conversion engine, will even consider trading my 74 duster 440 for the conversion.

    * The limitation of hp on the convertion is no diff than on a 440 build up,build the bottom end to handle the hp and you would be ok

    * The only mod you have to do to the block is to grind where the pusrods go next to the block and run a hemi cam.Amd run a Hemi top end and pistons

    5 years ago the cost to build a conversion engine was about $7500.

    * Stage V* rockers are widley used in top fuel cars.Investment grade rockers.

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    Re: Wedge Vs Hemi blocks - mods required?

    A new Hemi block and heads are what, about 5500 today? Conversion heads used special rockers, a true hemi can use even the top fuel ones. But of course, you have to do what ever you have to do.

  8. #7
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    Re: Wedge Vs Hemi blocks - mods required?

    Ane set of hemi heads and valve gear is about $5000 add hemi block $2500

    I have lost the guys web address that had the conversion heads I think I'll have to post a want add on racing junk and see if he'll resond.

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