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Original Message
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Questionable Ford Specs |
By Travis Miller - 01/05/2002 1:33:06 AM; IP 205.188.199.162 |
Two of the most bogus specs sent to NHRA by Ford was the minimum combustion chamber cc's for the C5AE-F Medium-riser head and also for the Hi-riser heads. Ford sent specs stating the cc's on both as 66.0. There is no way that is correct. The actual figures for each should be somewhere up around 85 cc's. What it actually did was cause racers to mill way too much off the heads trying to obtain as much compression as legally allowed by the minimum cc spec. That is one of the reasons that good Medium-riser and Hi-riser heads are rare today. That also makes the price outrageous.
As far as how the specs are obtained by NHRA, every year the car manufacturers are sent a form asking for engine specs. It is basically a fill in the blanks type of sheet. There are spaces for bore, stroke, head cc, head gasket thickness, deck clearance, cam lift, cam duration, cam overlap, valve sizes, rocker arm ratio, carb number and measurements, head and intake manifold casting numbers, valve spring type, valve spring open and closed pressure, and probably a few other things that I have forgotten to list. This has been going on since the early to mid '50's. Of course not every manufacturer sent data on every engine built. But there is some really interesting data on file at NHRA in the Tech Dept. I am really lucky to work for NHRA and have access to this data. |
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