raised runner vs 23 degree, velocity

[Little Mouse]

Company in Australia using an Australian foundry makes a 225, 15 degree as cast 225 raised runner head really good exhaust flow numbers. But lets say on the intake side of things would this size runner be considerable better then say a 230 regular 23 degree head on its velocity. Without a pinched off area for the push rod and a little longer in length runner i would think its cross section overall might be smaller then the 23 degree head of the same size. With a 15 degree valve angle would the 2.15 size intake valve work ok in a smaller bore of say 4.040. I suspect the chamber may well be better shaped to fit at least a 4.125 size bore block. No experience with a raised runner head.

[racear2865]

Is this the cast iron head or the aluminum head. There is a raised runner in both
reed

[mag2555]

In general a raised runner intake port will have less changes in port area, and as such will have a better velocity profile for making more HP for a given amount of air flow if you where to do a Apples to Apples comparo!
I assume you are building for max power above 7k RPM with what I just posted?

[Little Mouse]

yes a 8,000 rpm small cu. build. If i'm going to spend money for a solid roller and shaft rockers why not just go to a small raised runner head. JE and most likely others make off the self 15 degree pistons. Been thinking lately with my CDL license all i will end up doing is get myself in trouble with any form of a street car.

[Walter R. Malik]

Company in Australia using an Australian foundry makes a 225, 15 degree as cast 225 raised runner head really good exhaust flow numbers. But lets say on the intake side of things would this size runner be considerable better then say a 230 regular 23 degree head on its velocity. Without a pinched off area for the push rod and a little longer in length runner i would think its cross section overall might be smaller then the 23 degree head of the same size. With a 15 degree valve angle would the 2.15 size intake valve work ok in a smaller bore of say 4.040. I suspect the chamber may well be better shaped to fit at least a 4.125 size bore block. No experience with a raised runner head.

Are you talking about and comparing a "Raised Runner" 23 degree head like the Racer Pro...? Or, just the regular 23 degree Chevrolet head...?

[Little Mouse]

Just a regular 23 degree head along the lines of what people buy from AFR.