[Michaels76SE]

It started out as a 67 cast iron intake, did a gasket match which led me pretty far into the ports with a long bur and an equally long snap gauge, removed the exhaust crossover and the water crossover, cleaned it all up with a few different methods of metal removal and I'm going to paint it the same color as the early sixties super duty motors. My back hurts now.

[Michaels76SE]

More pics

[hgerhardt]

Nice job! Huge amount of work! Did you happen to weigh it before/after?

[Michaels76SE]

Originally Posted by hgerhardt

Nice job! Huge amount of work! Did you happen to weigh it before/after?

it was an impulse task so I might weigh the next one. I also drilled too hard and put a hole in a spot where I also went too far with the grinder. Still a bit of welding repair before I paint it.

[PDC]

That looks really, really nice.

[Tom Vaught]

Chuck Robers did a 1965 Cast Iron Tri-Power intake that way back in the early 80s and after it was cleaned and prepped, had it aluminized so it looked like the modern 1966 aluminum Tri-Power intakes being sold today.

GM Engineering made at least ONE 1965 Aluminum Tri-Power intake as I saw it first hand and held it in my hands. (Owned by a Collector of Rare Pontiac Parts). Nice work there but a Lot of Exercise involved, lol.

Tom V.

[Michaels76SE]

Originally Posted by Tom Vaught

Chuck Robers did a 1965 Cast Iron Tri-Power intake that way back in the early 80s and after it was cleaned and prepped, had it aluminized so it looked like the modern 1966 aluminum Tri-Power intakes being sold today.

GM Engineering made at least ONE 1965 Aluminum Tri-Power intake as I saw it first hand and held it in my hands. (Owned by a Collector of Rare Pontiac Parts). Nice work there but a Lot of Exercise involved, lol.

Tom V.

I've seen reproductions being sold for as much as 500 bucks

[694.1]

The port mis-match was quite surprising.

[Michaels76SE]

Originally Posted by 694.1

The port mis-match was quite surprising.

I figure Pontiac had an idea about getting port velocity with a certain shape of port in 1967. But it could have been core shift.

[Donovan]

That's it, you got it.

Nice work.

If you thought you wanted to get the factory choke working again, you could buy a repro crossover and fit it.

I did one recently too. It's a lot of fun.

[Michaels76SE]

Originally Posted by Donovan

That's it, you got it.

Nice work.

If you thought you wanted to get the factory choke working again, you could buy a repro crossover and fit it.

I did one recently too. It's a lot of fun.

I think this manifold will only be used in special occasions with a Holley mechanical secondary and during the middle of summer. I'm currently staring at a set of cylinder heads to match for a target power band between 2500 and 5500 rpms.

[Donovan]

I didn't port match mine, but did similarly.

Stock 68 intake started at about 43lbs and ended up at 27.5lbs without the water crossover
32.5lbs with. It would be 39-40lbs with the HO exhaust crossover included.

For random comparison, an RPM intake was about 17lbs
P4B QJ is about 14lbs

301 4bbl is 30lbs

Stock 71 HO aluminum is 14.5 without exhaust crossover
21.5 with crossover

The HO intake saved about 20lbs to a similar cast iron unit.

[Donovan]

Originally Posted by Michaels76SE

I think this manifold will only be used in special occasions with a Holley mechanical secondary and during the middle of summer. I'm currently staring at a set of cylinder heads to match for a target power band between 2500 and 5500 rpms.

Nice...

When I ran my HO intake with the crossover blocked off, I converted to an electric choke. This worked well too.