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Originally posted by mvierow:
If you plan to build your motor around those heads, then I would say no. But then again it depends what you mean by streetable. If sitting at a stoplight at 3000rpm's because you can't make idle any lower than that is streetable to you then I guess so. You would probably have to run a manual tranny too.
HUH? I guess I don't read enough Hot Rod Magazine! What in hell does the flow potential of a cylinder head have to do with idle speed? By that reasoning any of the following engines would be undrivable; boss302, Boss429, 427tunnelport, 302tunnel port, Boss351, 3514V, Gurney-Weslake302, LS-6Chev etc.etc.etc. Forget all the BS you read in HOT ROD. Awhile ago they had two Chevs built using as many identical parts as possible; cams, intakes carbs piston configurations etc. Throughout they predisted the small block with its "high velocity" ports, lighter rotating mass, smaller valves etc was going to be the "torque monster" and perform better. When completed the big block made more torque, more power and though many pounds heavier on the nose of that Camaro , was 2 tenths quicker while suffering traction problems! So much for their absurd theories that one can fill a barrel quicker through a soda straw than through a stove pipe!
[This message has been edited by mvierow (edited 04-09-2002).]

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Originally posted by Dusty Kiser:
What in hell does the flow potential of a cylinder head have to do with idle speed? By that reasoning any of the following engines would be undrivable; boss302, Boss429, 427tunnelport, 302tunnel port, Boss351, 3514V, Gurney-Weslake302, LS-6Chev etc.etc.etc.

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I think what's being discussed is port velocity.
If you have two heads that both flow 300 cfm, one with a 190cc port and one with a 230cc port, the smaller port version will make more low end.
All of the above mentioned heads are good race heads that make less low end torque than other heads.
I currently run 351C 4V heads and am looking at using port stuffers and a smaller volume intake to increase the port velocity....
By heads to meet your needs, not just by the port size.

I think the 225's would huge be overkill, I bought the AFR 185's and have built my motor around them.

A car does not go fast simply by buying the biggest, most expensive, or the best parts.

They must be assembled in a way to compliment each other.

Let me use an example:

You go out and buy some 2 in hooker super comp headers,3 or 4 in mandrel bent exhaust with xpipe, 3 or 4 inch _______(insert race muffler here)
Now you go to a reducer to bring it down to 2 in tail pipes that are bent on a crappy bender , leaving a very poor bend.

Now can you honestly say that this exhaust system is going to work well?

It takes an entire puzzle to make a good combo , and if all the pieces dont fit properly, then while you may make them fit if you force them to, but they will not work well.

As far as the 1 5/8 working, I really dont think that they would, I am not sure but i do believe that the 225's are a higher port head(I have not really looked at these heads at all).

Good luck