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?
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.
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.
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.
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.
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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