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11-15-2002, 10:48 AM
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Pontiac 400 cam choice?
Found out last week that the cam in the engine I'm going over was junk (collapsed one lifter and flattened a lobe), and I've started looking at replacements. It's for a 1973 Pontiac Firebird that's had major head work done by the previous owner - gasket ported, 1.77/2.11 valves, and "milled to 65cc" according to the spec sheet that came with the car.
So I'm looking at compression at or above 11:1, but otherwise a really nice set of heads, stock crank and connecting rods, and TRW stock-equivalent pistons. Drivetrain is a T-10 with 4:10 posi, and 15" tires. What cam specs would you suggest I look for for a streetable ride? Any help is appreciated. -zac 
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11-15-2002, 11:06 AM
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You may want to look to a cam with enough duration and overlap to bleed off some of that compression.
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11-18-2002, 01:48 PM
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I would recommend the RAIV replacement cam either from Crane or Crower. Lunati makes one similar, too. I'v heard good reviews about the larger of the Summit Racing Cams they offer.
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11-18-2002, 05:43 PM
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i was looking at summit's #2802;
duration @ .050: 224 intake/234 exhaust lift: .465 in. intake/.488 in. exhaust separation: 114 degrees RPM range: 2,500 to 5,000, which works well with the 4.10 rear gears and 4-speed. for $87 for the kit, I'm tempted to just go for it - any other ideas? thanks again. --zac
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11-19-2002, 06:47 AM
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That would be a very good kit for that motor. I know someone that used that same kit and loves it.
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11-19-2002, 03:52 PM
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thanks!
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11-25-2002, 02:12 PM
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i am running a GTO with a 468 with a ra1v wirks just great but you ain't going to like that 4:10 Pontiac's are grunt engines and don"t like a lot of rpm's I use a 3:73 and put in a built 200r4 just so I could drive it on the e-way other wise I was twisting 3000 rpm at 60 Just my 2 cents worth
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11-25-2002, 03:27 PM
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i'll quote you from "best bolts ons" HRM 5/2002 "Stock camshafts even the ram air iv are totally obsolete. ...pontiacs respond much better with modern cams." i do not know if the "new" ram air iv cams are same or different than stock. Bruce Fulper goes on to say he has comp cams make a grind of his own that will work with 1.5:1 rockers, his phone is 909-370-0389 and <a href="http://www.pontiacengines.com" target="_blank">www.pontiacengines.com</a>
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11-25-2002, 05:20 PM
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i personally don't have the $ for a comp cams grind, can buy 2 or 3 summit cams for the same price and i won't drive it hard enough long enough... thanks tho
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11-26-2002, 07:23 AM
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Bullheimer, The RAIV cams I was referring to are NEW designs. They are the Cam manufacturers replacement for the RAIV cams......new computer designed....
Steppenwolf, The Summit cam is not a RAIV cam, but it is a very good cam and you'll be happy with it. Should have a little lope at idle.
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