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Old 12-03-2002, 06:41 PM
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Post STREET HEADS ???

Hello everbody! My friend is building a 406 and he can't decide which heads to use. We're wondering will big intake runners help you or hurt you on the street? World products heads have 220 runners with 2.05/1.61 valves, and pro 1 have 200 runners with 2.08/1.61 valves. He will be using a RPM AIR GAP intake with a full roller set up(cam,lifters,rockers). Carbureator is still undecided too. Any help or ideas will be gladly appreciated.

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Old 12-03-2002, 06:59 PM
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For a street motoor, you will probaly be better off with a smaller runner head likee the Sportsman or S/R Torquer. The larger runners will kill low end which is what you want on the street.
Chris
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Old 12-04-2002, 09:00 AM
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I am running AFR 190cc Street aluminum heads on a 350 small block with an air gap intake, 770cfm Street Avenger and Comp cam 280H with blockhugger headers. 3.80-1 rear gears. Great combo and works excellent for the street in my case. Vehicle weight is 2660 pounds.

[ December 04, 2002: Message edited by: Frisco ]</p>
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Old 12-04-2002, 12:57 PM
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You need to consider the whole package so the cam chosen matches the heads, etc. You need to choose harmonious parts that work to fulfill the needs.
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Old 12-04-2002, 04:54 PM
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Does anyone have any recommendations on some monster streetable heads. My friend doesn't like the s/r tourqer heads that TURBO S10 recommended. He say that the valves are to small. He wants to run atleast 2.05 valves. His cam specs are 234/242 with .539/.588 lift!! So do he need valves this big or is he wasting money Any help or comments will be appreciated! Also he has 1.5/1.6 roller rockers!! <img src="graemlins/pimp.gif" border="0" alt="[pimp]" />
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Old 12-04-2002, 06:28 PM
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Sounds like your friend has his mind made up already.

How much compression and how many RPM's? Oh yea how long are the rods?

[ December 04, 2002: Message edited by: Infomaniac ]</p>
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Old 12-04-2002, 07:08 PM
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He has 11 to 1 flat tops, and the rpm range for his cam is 3000-6500. And he will be using a th400 trans with a 2800 stall. He sort of has his mind made up but if there is a better product for his set up that's what he'll go with. But he likes to have it explained why that the product would be better than what is already chosen. Thanks alot guys!
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Old 12-04-2002, 08:13 PM
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OK: as mentioned the ports and valves are a bit big for normal street use. But: if he is running a stock rod length he can get away with big valves, ports, intake nainfold and carb.

If this is the case I would use the Dart heads and 800 CFM carb.

Short rod engines have fast piston speed away from TDC. This causes a high vacuum. This allows bigger than normal engine combination as mentioned above.

That should make him happy.
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Old 12-05-2002, 06:24 AM
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Check out the flow specs on AFR 210 heads. They flow better than any other head on the market.

www.airflowreseach.com
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Old 12-05-2002, 07:24 PM
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You asked if the big ports will hurt on the street. The answer is yes, and your friend needs to understand that big vavles are not everything. This is especially true on the street. Bigger is far far from always better. On the track with a radical roller cam, big stall and tall gears the big heads are the way to go. It depends where his priorities are. I think alot of people are more concerned about bragging about the race built engine in their street car than the practicality of it.

Chris

[ December 05, 2002: Message edited by: TurboS10 ]

[ December 05, 2002: Message edited by: TurboS10 ]</p>
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