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#1
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I made an H.O. manifold....... I think
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.
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#2
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More pics
More pics
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#3
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Nice job! Huge amount of work! Did you happen to weigh it before/after?
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#4
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I didn't weigh it.
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.
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#5
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That looks really, really nice.
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#6
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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.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#7
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Quote:
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#8
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The port mis-match was quite surprising.
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"At no time did we exceed 175 mph.” Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea... Still have my 1st Firebird 7th Firebird 57 Starchief |
#9
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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.
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#10
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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. |
#11
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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.
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#12
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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. |
#13
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Quote:
When I ran my HO intake with the crossover blocked off, I converted to an electric choke. This worked well too. |
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