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Original Message
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| They are good but.... |
| By Royce Peterson - 05/08/2003 4:31:01 PM; IP 65.57.4.104 |
The C6AE-R heads are not as good as Medium Riser or High Riser heads. Unmodified they are not as good as CJ or Low Riser heads, particularly on the exhaust side.
The Medium Riser heads will always fill the chamber better because of the straighter, wider intake port. The C6AE-R head suffers the same problem as a CJ or Low Riser head on the intake side of having the port opening too low. These heads can show good numbers on a flow bench but not perform as well because the intake charge has to make a sharp turn due to the port floor. That is why when Edelbrock made their aftermarket FE head the Medium Riser was the basis for the design.
The C6AE-R head is better than most standard FE heads but not as good as any of the 427 - 428 CJ varieties in unmodified form. I think with a lot of work you could get really good flowbench numbers but for the amount of labor involved it would be better to just buy a set of Edelbrock heads.
My own set of C6AE-R's cost $50 for the pair at the junk yard and now have another $800 worth of CJ sized stainless valves, bronze guides and teflon seals with a serious multi angle seat / radius cut valve job. I drilled them for CJ manifolds and cleaned up the ports some. They were noticeably down on power compared to a set of CJ heads on the same engine now. The exhaust ports would need some serious work to be as good as the CJ port.
Royce |
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