Drilling magnum heads for LA intake

[jos51700]

Could you buy a crosswind intake and use that as a jig? It's got both sets of holes. A drill bushing would be the only other part.

 

[New fish]

That would be awesome

 

[New fish]

I got a jig that worked well for me. Drilled to 5/16 thread so it keeps the magnum threads and the new smaller size la threads. I live about 2 hours from you I would guess. I'll see if I can dig it out

That would be awesome

 

[RLF Cuda]

Despite the 6-Pack intake being no better than, and probably not as good as a say Air Gap intake, the visual impact is stunning and any power loss is minor for 99% of intended uses.
What I would do is carefully set the manifold on the engine and use a drill bit of exactly the hole diameter (may need numbered bits) to scribe a center point for the hole. Then take the head to a competent machine shop with a good drill press and level to drill the head and tap to the proper thread. It might be wise to even HeliCoil the head if you think you might remove the manifold frequenlty.

 

[Cuda416]

Despite the 6-Pack intake being no better than, and probably not as good as a say Air Gap intake, the visual impact is stunning and any power loss is minor for 99% of intended uses.
What I would do is carefully set the manifold on the engine and use a drill bit of exactly the hole diameter (may need numbered bits) to scribe a center point for the hole. Then take the head to a competent machine shop with a good drill press and level to drill the head and tap to the proper thread. It might be wise to even HeliCoil the head if you think you might remove the manifold frequenlty.

A transfer punch would be the way to go as far as marking.

 

[macdrew77]

I used 3/8 OD x 1/4 ID bronze bearings to guide the drill bit. 1/4” drill bit is only .002 under the 5/16-18 tap drill size and it worked good for me.

https://www.lowes.com/pd/Hillman-1-Count-1-4-in-Bronze-Machine-Bushing/3024775

I can get you pictures of the results on my EQ heads when I get back from vacation in a week.

 

[New fish]

That would be great