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Old 10-15-2006, 02:13 PM
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[B]Help with cam selection[/B]

Aloha From Maui,

I'm new to this engine building thing and need some help choosing a cam. I have a light weight 2002 S10 that is back halved and will be a Pro Street truck that I will race occasionally. It won't be a daily driver!. Here's what I have.
400 block bored 30 to a 406
Speed Pro flattop pistons
Eagle 5.7 H-beam rods
Brodix Race Rite Heads
180cc/67cc 202/160 valves
Weiand tunnel ram
2x4 Holley 600s/ vac.2nd.
I think I want to stay with a solid cam. Ok pros, how about some help!!!
Thanks in advance!
Oh by the way we JUST had a 6.5 earthquake!!!!!!!Everything is OK!

Mahalo, Thom
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Old 10-15-2006, 06:53 PM
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Welcome to the site. Being a firm believer in using available technology call or visit online with Comp Cams http://www.compcams.com/ or Crane Cams http://www.cranecams.com/, or similar company. They want happy customers and will do their best to get you the best profile to meet your needs and it's a lot cheaper than guessing!!
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Old 10-15-2006, 09:11 PM
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Thom I agree with jalopy45. Many of us could recommend a camshaft for your truck, but give the cam companies a call and ask for their recommendations. Be honest with yourself and them about your goals for your truck and make your decision based on more than one opinion.

As for your induction, I ran a similar set up in the mid 80's. I would reconsider using 600 cfm carbs. I used the Holley list# 9776 carbs rated a 465 cfm and loved them. I believe they are rated at 450 cfm now. If you use the smaller carbs you will not believe the throttle response.

Barry
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Old 10-15-2006, 10:10 PM
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I do think calling the cam companies is a good idea, and I usually do to make sure I am on base with a cam that I have picked out before I buy one, but you can get a really good idea of what to run for a cam simply by matching it to the rest of your parts. There is one little problem I could see you running into picking a cam. The intake is designed for higher RPM power, and the heads are designed for lower RPM power. Below are the recommeded power ranges for the heads and the intake you are using.

Brodix RR 180cc heads: 1500-6000 RPM
Weiand tunnel ram: 2800-8000 RPM

It will be a little hard to get a cam that will work really with both of these pieces. I would recommend a cam that is rated for ~2000-6000 RPM (the xs274s, 236 242 @.050 .510 .510 lift 110 LSA would probably work well, rated for 2000-6400 RPM) to match the heads and then run a ~3000 stall to get into the powerband of the intake when you mash it. Also, with a -5cc flat top piston and 67cc chambers, you are looking at 11:1+ compression. That will probably not run on pump gas. Are you thinking about mixing in some race fuel?

Adam
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Old 10-16-2006, 03:44 PM
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Gears?
Stall?
Compression?

Yes, a mismatch in components with the small heads, 406 cid, and tunnel ram.
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Old 10-16-2006, 04:05 PM
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cam selection

Ok guys I told you I was new to this!!
I gave you guys the wrong head stats. I have the aluminum Brodix but they are 170 runners with 67cc chambers
Man I just had that tunnel ram powered coated and rebuilt the 600 Holleys!!I can do two things. Go with a Air gap type manifold with a 750 Holley or stick with the tunnel ram and go with a new set of heads. I still need a cam.
I have a 300 stall, 456 gears, The Speed Pro pistons are flat tops w/-5cc for about 11:1 CR
406, stock crank, Eagle H-beam 5.7 rods.
It's going into a lightweight 2002 S10
PLEASE HELP A ROOKIE!!!
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Old 10-16-2006, 04:45 PM
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You need a cam with at least 292 degrees of intake duration bleed off some cylinder pressure to run pump gas. Plus that gear and stall would like a cam that can make power to 7000rpm.

Use a dynamic compression calculator program and get a cam with an intake closing point late enough to produce a 7.5:1 to 8.0:1 dcr. I'm guessing a 292 degree cam with a 106 installed intake lobe center will be just about right. Intake valve would close at 72 abdc.

I think you need to sell your heads and get a set of 195cc arf's or a good pair of 200cc heads. Then install a compcam 292H or 294S if you don't mind adjusting valves and a chattering valve train.

My compcam 292H pulls to 7000rpm with a set of 200cc dart iron eagles and a performer rpm intake (11:1, 93 octane). Valves float at 7200.
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Old 10-16-2006, 04:53 PM
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The 170 cc heads are too small for a 406. You should have something in the 200 cc and up range. If you want to use the tunnel ram, use it. Use the correct size carbs ( see my previous post ) and tune it correctly and you will be pleasantly surprised. I have helped a few people on here set up and dial in their tunnel ram set ups after many people say to stay away. I have been running tunnel rams on my street cars for over 20 years.
A previous combo I ran. 406, 186 casting heads slightly ported by me, tunnel ram w/ 2 9776 Holleys, Comp Cams 280 magnum, 11" TCI converter, 12 bolt with 4.10's. 12.70's in the quarter and 15 mpg on the highway in a 71 Camaro. That was 21 years ago.
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