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#1
12-16-2002, 05:38 PM
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I have '73 Grand Am with a 2 barrel. I'd like a little more kick. If I put on a new carb and intake do I need to change the cam for full effect? Did Pontiac put a more aggressive cam in the 4 barrel motor?
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1966 GTO 1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60' 1969 Bonneville Safari- cross country family cruiser. . 1979 Trans Am 400, 4-speed, 4 wheel disc. View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A Ride along in the other lane-http://www.youtube.com/watch?v=mIzgpLtF_uw |
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#2
12-16-2002, 05:38 PM
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I have '73 Grand Am with a 2 barrel. I'd like a little more kick. If I put on a new carb and intake do I need to change the cam for full effect? Did Pontiac put a more aggressive cam in the 4 barrel motor?
__________________
1966 GTO 1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60' 1969 Bonneville Safari- cross country family cruiser. . 1979 Trans Am 400, 4-speed, 4 wheel disc. View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A Ride along in the other lane-http://www.youtube.com/watch?v=mIzgpLtF_uw |
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#3
12-16-2002, 06:53 PM
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Yes, in addition to the cam being totally different, the heads have smaller intake valves of 1.96" compared to the 4 barrel 2.11", and the heads will have lo-po pressed in rocker studs. Also, Pontiac used different main and rod bearings in a 2-bbl engine, but that shouldn't make a big difference.
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#4
12-18-2002, 07:40 PM
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Thanks for the info Rick. I knew earlier Pontiacs Had all those differences between low compression 2 bbl motors and their higher compression 4 bbl counterparts but didn't know they kept the diffs when compression dropped across the board in the early '70s. BTW where is "Cornball" NY? In the spring I'm trying to get some 1st generation GAs together in western CT. I know I can get at least 4 '73s there.
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1966 GTO 1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60' 1969 Bonneville Safari- cross country family cruiser. . 1979 Trans Am 400, 4-speed, 4 wheel disc. View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A Ride along in the other lane-http://www.youtube.com/watch?v=mIzgpLtF_uw |
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