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Author Topic:   street cam
theslowguy
Dirt Full Roller

Total posts: 30
posted August 08, 2005 09:07 PM  
I know this is a dirt forum, but i was hoping someone here could help with cam selection for a street car. have a 406ci sbc with dart iron eagle street performer heads but considering getting a set of aluminium heads. Running an Edelbrock RPM air gap, 750cfm mighty demon carb, flat top pistons, H-beam rods, and a forged crank. Going to go hyd roller and want the power band to be somewhere in the 2500 to 5500 range. It's in a 70 Camaro with a built 700R4 and a 3.08:1 posi. It will be street driven regularly but that doesn't mean it has to be streatable. If it lopes like crazy and hardly pulls any vaccuum, so be it. I figure a 6000 redline would be decent, so i know i need a cam that's alot smaller than you all are used to dealing with. Any suggestions will be greatly appriciated. Thank you.

A. Bighurry
Dirt Full Roller

Total posts: 35
posted August 09, 2005 05:52 PM  
A tech at Comp. or Crane might be more helpful.

eenfield
Dirt Maniac

Total posts: 116
posted August 09, 2005 08:09 PM  
First off you should strongly consider changing the rear gears to at least 3.50:1 or better yet something steeper like 3.73/3.90s. Especially since you have the overdrive. Gears alone can take a car from zero to hero.

As for the cam selection I would recomend (if you are still gonna run the HR) The Comp Extreme Energy 282HR with 230/236 dur @ .050 lift. It has .510/.520 lift. This cam would want about a 2000rpm stall converter. With the low first gear you have and the little looser converter you could probably make the cam work with those 3.08s, but gears would still be a good idea.

You could also go with the 288 with 236/242 dur at .050 lift and .520/.540 lift. This cam would want gears (3.73-4.10) and at least a 2500rpm stall converter.

Either of these cams with gears would be screamers. I wouldnt go any bigger than the 288. With your overdrive watch your cruise speed( may be out of the cams cruise range).

6500 RPM is not out of the question with that kind of bottom end.

A couple more things to consider, is that Comp recomends using a new GM distrabuter gear with their cams. (went through that with mine the hard way) GM dealerships sell them under PN. 10456413. It is for .490" shaft distrabuters. Also if you have a high perf. fuel pump Comp also recomends you run a bronze tipped p/r. Like I said these are a few things that I learned the hard and expensive way.

Hope this helps.... -Eric-

theslowguy
Dirt Full Roller

Total posts: 30
posted August 12, 2005 07:30 PM  
Thanks alot for your input. I'm a big fan of high gears, if you think your gears are too low, you just aint got enough motor to push it. With the 355 that was in this car it ran the same 1/4 et (within 1/100) with 3.08 as it did with 3.73 but at a **** of alot higher trap speed and better mileage to boot so why run lower gears if you can get there with high ones. The advantages of street cars, no rules, no tech. I thought that the retro roller cams came with an old stlye dist. gear formed on them so they would be compatible with older dist. but i will look into it. Thanks for the heads up, and I never would have thought about the fuel pump push rod eating the cam so that could have been costly as well.

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