Thread: Brodix IK Heads.
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11-12-2015 11:28 AM #11
You know, hot rodding is fun....until you add an overdrive transmission....and vary the elevation between 5000' and sea level.
That's what the factory engineers have to do every time they design a new vehicle, but they have mega-computers to aid them in their choices.
The best I have to work with is some basic math and a modicum of common sense, but I'll do what I can to contribute to the project.
The first thing that must be considered is the gears in relation to cam timing. Your 3.70 rear gear with a 0.67 OD transmission gear and a 31" tire is the same as using a 3.20 rear gear, 0.67 trans gear and 27" tire, so the cam will have to be pretty short to work with that at cruise speed (65 mph @1750 rpm's). I have encountered many fellows who failed to take that into consideration, using a cam that has an operating range of 2500-6000 for instance, when they actually need a cam that has a low operating rpm of ~1500-1600 up to a high range of ~5000. Question is, how do you drive around Henry Hotrod with a short cam? The obvious answer is to use a turbocharger or a blower. Before we go any farther, are you up for that?
The other variable is elevation. If you jet the carb for running good at 5000', the motor will go real lean at sea level, with a very real possibility of holing some pistons. If you jet it for running good at sea level, it will be hog-fat at 5000'. The obvious answer is programmable electronic fuel injection with O2 sensors in the header collectors and using a cam with a 114-116 lobe separation angle, like the OEM's do. Again, are you up for that?
.Last edited by techinspector1; 11-12-2015 at 01:06 PM.
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Visited a family member at Dockery Ford from the time I was 1 year old through their ownership and then ownership change to Morristown Ford. Dockery was a major player in the Hi Performance...
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