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Old 09-27-2010, 09:11 PM
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What would be the best Cam for a 474 street engine

I have a pontiac 455 bore out to 4.211 the cam I would like to use is a 51-433-9 comp cam 236intake 242Exhaust. Will this Cam be a good street cam?

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Old 09-27-2010, 09:39 PM
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You might send a pm to WDCreech, he is probably the most Pontiac performance oriented guy on this board. He can tell you who to talk to as far as Pontiac specialists go.

My thought is that cam is too small, but you didn't give car weight, rear gear ratio, rpm range you are looking for, converter stall, max rpm redline, cylinder head used, stock or aftermarket connecting rods, or exactly how streetable you need it to be. Just a street cruiser, or some strip time also?? Do you tend to be a racy type, or not??
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Old 09-27-2010, 09:54 PM
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Quote:
Originally Posted by eztuld
I have a pontiac 455 bore out to 4.211 the cam I would like to use is a 51-433-9 comp cam 236intake 242Exhaust. Will this Cam be a good street cam?
Agree that WD Creech would be the man to talk to, but
Yeah, I would run it on the street.....
HYDRAULIC ROLLER − Rough idle,
needs 2800+ stall, lower gears and
9.5:1-11.0:1 static compression ratio.
If I were going to use it, I would want a good set of aluminum heads, high-rise dual-plane intake manifold, 850 carb, large-diameter equal-length headers and 10.00:1-10.25:1 SCR, minimum 3.73:1 rear axle ratio, preferably 3.90-4.10. I'd also want to set it up with a tight squish. Here's some verbage from Edelbrock that may help....
http://www.edelbrock.com/automotive_...6000/60579.pdf

Last edited by techinspector1; 09-27-2010 at 10:09 PM.
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Old 09-27-2010, 10:25 PM
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The car is a 1968 400 Firebird 3200-3500 lbs. I don't know what the rear gear ratio is, it is still stock. The heads that I'm using are Pontiac 6X-4 Heads ported, EAGLE or SCAT H-Beam 6.800" Rods. The rpm range I would like is from 1800-6000. This is the first time rebuilding an engine so....I'm trying to get all the help I can so I do it right.
The list of parts from Butler performance is
467-474 cu in balanced assembly
comp cam 51-433-9
Hydraulic lifters & roller rockers
springs for the pontiac 6X-4 heads
Ferrea 2.11 intake
Ferrea 1.77 exhaust
The intake and carb I don't know yet
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Old 09-28-2010, 12:10 AM
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If Butler Perfrmance pointed you in the direction of that cam, I would go with it, they know their stuff. Glad to see you got a better rod in it.

Last edited by ericnova72; 09-28-2010 at 12:28 AM. Reason: spelling
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Old 09-28-2010, 12:34 PM
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Quote:
Originally Posted by techinspector1
Agree that WD Creech would be the man to talk to, but
Yeah, I would run it on the street.....
HYDRAULIC ROLLER − Rough idle,
needs 2800+ stall, lower gears and
9.5:1-11.0:1 static compression ratio.
If I were going to use it, I would want a good set of aluminum heads, high-rise dual-plane intake manifold, 850 carb, large-diameter equal-length headers and 10.00:1-10.25:1 SCR, minimum 3.73:1 rear axle ratio, preferably 3.90-4.10. I'd also want to set it up with a tight squish. Here's some verbage from Edelbrock that may help....
http://www.edelbrock.com/automotive_...6000/60579.pdf
I don't think I could add anything to that, except that if you are going to use a turbohydramatic transmission, you could probably gat away with using rear gears in the 3.50 or deeper range, but you will need a converter with at least the 2800 stall that techinspector suggested.

Bill
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Old 09-28-2010, 12:49 PM
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Is a 2800 stall too high for driving on the street with a turbohydromatic transmission? would I be driving in first all the time to keep the rpms up, I read someplace that a high stall like 2800 is hard on the engine & transmission as it wouldn't reach 2800 rpms very often. The application would be street and the odd time at the strip and the car would be driven maybe 6-12 times a month.
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Old 09-28-2010, 03:16 PM
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Quote:
Originally Posted by eztuld
Is a 2800 stall too high for driving on the street with a turbohydromatic transmission? would I be driving in first all the time to keep the rpms up, I read someplace that a high stall like 2800 is hard on the engine & transmission as it wouldn't reach 2800 rpms very often. The application would be street and the odd time at the strip and the car would be driven maybe 6-12 times a month.
A 2800 stall converter is not too high for street use! I had a 5500 stall in my '63 LeMans and as long as I didn't stand on it, it worked fine for around town. The rpm would climb a bit when I started up a grade.
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