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#1
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How does the Ho make 20 extra horse power?
How does the 421 3x2 Ho @ 376 HP make 20 extra horse power Over the 421 3x2 356 HP engine? I'm guessing it might have some thing to do with the factory cast iron exhaust headers or did the none HO 421 cars get them too?
Thnaks Brian |
#2
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I would think the extra cfm from the tri-power, and better heads and the manifolds did help some. I bought a parts car 10 years ago, a 66 2+2. The 421 was gone but I got most of the good stuff that was salvageable. I did not know the rarity of the manifolds. I sold the scrap to a yard and when I went back and found the 65 parts car I bought he told me that a guy jumped up and down when he found the manifolds still on the car.
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#3
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As Hitman said, the exhaust manifolds and the different heads. There is probably something else that I'm forgetting too. But they both have the same cfm.
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#4
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This brings up a question I have always had. Could you get a 421 tri-power car that was not an HO car? If so, it would have to be the manifolds & 10.75:1 heads. I always assumed that all 421 tri-power cars would also have the manifolds, 093 heads & duals.
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#5
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Quote:
Patrick |
#6
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cam and exhaust are the big diffs.
patrick, you don't want the early forged rods, they're called rubber rods for a reason. mike
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#7
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In '65
Tripower (HO) Tripower (non-HO) Forged rods cast rods Forged crank cast crank #77 heads (higher comp) #76 heads 068 cam 067 cam factory headers standard exhaust manifolds extra block for oil flow? did not have the extra block
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1970 GTO Convertible 455 Ram Air M-21, Atoll/Blue/Black, Hood Tach, 3:31 12-Bolt Posi, A/C, Console 1966 Grand Prix 421 Tripower 4spd, Marina Turquoise/Turquoise, a/c, console, posi, reverb. pa, pb, ps, remote mirror, mats 2010 Dodge Challenger R/T Classic, 6spd Hemi, Detonator Yellow, black stripe, black leather |
#8
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Like Mike said, the big difference in the 1965 376hp and the 356hp was the long branch exhaust manifolds used on the HO, and the HO also used the 068 cam, plus the HO had the three small air cleaners. The 356hp did use the same #77 heads as the 376hp HO, but used the smaller 067 cam. The 356hp also used the large single air cleaner which was probably more efficient than the three small ones, but the small ones looked cool, because you could see the multiple carburetion. The 338hp 4bbl. motor is the only 1965 421 that used the #76 heads.
Also to answer Deadheads question, Yes you could get a 421 tri-power that was not an HO,only the 376 hp version was considered an HO. On the 093 heads. The 093 head was used on the 356 and 376 in 1966 models, and the 092 head was used on the 338hp 4bbl. You can find all this in Pete McCarthy's book. Last edited by Doug Hopkins; 10-13-2007 at 04:50 PM. |
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