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Original Message
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| RE: C6AE-R heads and cam selection |
| By Derek66 - 04/03/2002 7:01:45 AM; IP 207.102.191.63 |
You can certainly fit the CJ-sized valves (2.09" Int/1.66" Exh) into your heads, while you're having them freshened up. You'll want to ensure that the seats are done correctly for use with today's fuels, and that a good 3-angle valve job is done. Valve springs should be upgraded to something compatible with the new camshaft.
As for your rocker arm assemblies, yes you must keep the hydraulic lifters with your non-adjustables. But you should also carefully inspect them for wear, cracks, etc. first. If they fail inspection, or you really want to run solids, buy a set of the adjustable rocker assemblies and the matching pushrods, and you'll have the flexibility to go either way with a cam. However, there's little reason for most people to run solids on a medium performance street motor, with so many good hydraulic profiles and components available nowadays.
For your application, in order to properly recommend a camshaft choice, we'd need to know things like vehicle model, curb weight, rear end gear ratio, and whether or not it's an automatic transmission. Also things like whether headers and low-restriction exhaust will be used, what intake manifold and carburetion are on the car, and whether you intend to upgrade any of the internal engine components, like stronger rods, forged pistons, etc. On any FE rebuild, I'd recommend having the rods fitted with premium rod bolts (like ARP), and having oiling system modifications done, including opening up and aligning critical passages, and the addition of a quality HV pump.
If you're looking to just do a 'stock' type rebuild on your 428, but want something a little stronger, I'd be looking for a dual-pattern camshaft in the 215 Int/225 Exh (duration @ .050"), .490" - .520" lift range. Like the original CJ camshaft, this will give you strong low-to-mid-range torque, and 6,000 RPM capability, respecting the limits of your non-SCJ internals.
The Ford C6AZ-H (428 Police Interceptor) intake manifold, or something similar (dual plane design), along with a 650-750cfm carburetor, will work well with your modified heads and this type of camshaft.
If you're NOT using headers, and don't have some of the better Ford exhaust manifolds (427/428CJ), you're going to bottleneck what could be a good powerplant. It has to be able to breathe 'out' as well as 'in'. And that means all the way to the rear bumper too.
For the pistons, consider the Keith Black/Silv-O-lite hypereutectics. They're an excellent piston, and come in very nicely between the prices for standard cast designs (which there aren't that many of these days for the 428s) and forged pistons. |
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