I think I'm going to try to build a drill jig to drill Magnum heads for LA intake At this moment, "the plan"
1....Take an LA head for a pattern, doesn't matter so much but MUST NOT be milled!! LOL
2....Two, maybe three flat straps say, 5/16 thick X 2 wide or so, which will sit on the cylinder surface, and locate the jig definitively using through bolts in the head bolt holes, 2 or 3 places. These straps will be welded to the jig, as they will be sticking out past the intake flange surface.
Drill these head surface pieces, provide a method to index them to the head bolt holes
Perhaps some sleeves that are a slip fit in the head bolt holes to provide reasonably accurate indexing, with minimally oversize sleeve inner holes for 5/16 or 3/8 bolts in the sleeves, depending on what I find
3...Suitable piece big enough to cover the intake ports and bolt holes, 1/4 thick X3 wide or whatever.
4..Using the head / cylinder surface as a "height zero" mark the height of the holes on the main jig strap. Then simply mark off accurate distance between intake bolt holes. These can actually be drilled OVERSIZE and actually don't have to be that accurate
5...Obtain sleeves to slip fit bolts for the intake bolts. Install the main piece, install the sleeves, and clamp them to the head with through bolts into the intake bolts.
6....So now you have the main jig piece clamped to the head via the intake bolts, the sleeves clamped to the main piece by these bolts, and you have installed the straps that bolt through the head bolts
7.....Kidnap a friendly TIG welder, and weld the main piece to the head surface straps, and all the sleeves to the main piece.
8....Paint if you really must!!!!
Thoughts/ alterations?
Here is one version:
I found another on here, but it's a photobucket "thing" and I guess you know how that crap went. Almost as bad as the "improved" software on here
Link to the thread:
Post no.20
What to do with my 360 magnum??
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