[Blainefab]

I need a SBC intake manifold - Damage/EFI/carb/condition doesn't matter, just needs to have/be:

1) SBC dist hole
2) aluminum
3) cheap

Thanks!
Alan 831 427-3296 PST evenings

[Torque]

Operation Delete Opti..... converting to dual synch distributor for cam and crank position signals and therefore need old style manifold to mate with LT1 manifold to provide the distributor mounting point. Alan's thinking it'd be easiest to cut out the mounting point and weld it to the LT1 Manifold rather than machining the LT1 to fit the distributor....

[StanIROCZ]

Operation Delete Opti..... converting to dual synch distributor for cam and crank position signals and therefore need old style manifold to mate with LT1 manifold to provide the distributor mounting point. Alan's thinking it'd be easiest to cut out the mounting point and weld it to the LT1 Manifold rather than machining the LT1 to fit the distributor....

What if it warps?

Have you seen http://www.lt1intake.com/ ?

[Blainefab]

Operation Delete Opti..... converting to dual synch distributor for cam and crank position signals and therefore need old style manifold to mate with LT1 manifold to provide the distributor mounting point. Alan's thinking it'd be easiest to cut out the mounting point and weld it to the LT1 Manifold rather than machining the LT1 to fit the distributor....

What if it warps?

Have you seen http://www.lt1intake.com/ ?

I might be able to get by with a hole saw and a drum sander if it was for a street car, but for a 8000 rpm race motor the hole has to be perfectly located. It's an odd size hole, and at a slight angle to horizontal. I figure If I start with the proper hole, my task is to simply put it in the proper place. I'm thinking make a template for a V notch out of each manifold on the band saw, with the donor piece a little oversize. Grind the donor hole to fit, weld in place. Warping will be minimized by bolting the manifold to a block, using minimum heat, lotsa tacks, and short welds. The margin that is affected is sealed with RTV anyway, so a minor offset will not matter. Warping of the gasket seating surface would not be good (GTP ported intake) but I think it would take abuse to affect them. I might just do a test run with the LT1 patch onto the 305 manifold.

[StanIROCZ]

How does that help you align things anyways? It is only going to be as precise as your cut(s), and a band saw isn't exactly precise.

Just my opinion, but if you are going to take it to that extent I'd think your time/money would be better spent just giving the manifolds to a machinist and saying "copy this onto this". Weld a piece of 1/4" flat stock on the top so they have some material to machine the 5 deg angle into. I don't think that would distort near as much as cutting a whole chunk out and welding in a new piece. We do quite a bit of this with early mock-ups and prototypes on die cast gear boxes, so I'm not exactly talking out my ass here.

Maybe I don't fully understand how and where you are cutting and welding.

Does the lt1 have the hole in the lifter valley the distributor contacts the cam?

The other way is to do it the lt1intake.com style by drilling a hole with a hole saw and epoxying the 5 deg spacer onto the manifold. I was looking at doing this before and I admit that I didn't feel great about it, but they seem to have some success. Their bracket that they use as a template seems Mickey Mouse IMO.