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Original Message
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| Use the "B" cam...... |
| By kevin - 09/08/2002 12:05:29 PM; IP 209.240.198.63 |
| if you are contemplating a Medium Riser. This is if you are running streetable compression. It was designed for 10-1 and works well. This is if you want the baddest sounding idle. You need to have a good set of headers, and you will really like it with them open. You did not say what car it is for, but good quality big tubes will allow you to have 475-480 HP out of a stock MR. The B cam can come on as early as 3,000 RPM's depending on your combo, but with the lower compression, it will be more like 3,500. It will hang on to 7,000 no problem. Your combo will have peak torque about 4,700-4,800 with that intake. The 112 overlap figure is not the same as the cams ground lobe centers of 106 for this one (B), and 114 for the factory installed 427 8-V 324 original that came in all Low Risers (which is 96 degrees of overlap). In the MR Ford used the 306 cam to achieve the same power level as the LR using the 324 (street cam, not the LeMans). You dont need a dual pattern with a MR near as much as you do with other FE heads. I do however suggest you re-think your gearing. I can pull 17 MPG out of an all stock 427 (highly blueprinted, and 200 hrs of work in the heads, my specialty) at 3,700 RPM's with the street 324 cam in a LR 64 Galaxie with 3.70 gears. This was a jump over the 3.50 gears by 2 MPG at only 250 more RPM's. An engine offers the best milage at peak torque, but the MR was never intended for that, and you need another engine if thats your intention. The MR did however average 4.5-5 MPG at LeMans, and was awarded the honor of the best MPG out there by the F.I.A. sanctioning body. Strange how it beat out the Ferrari's and other engines that had OHC's and such. That is a testamonial to the work by the Ford engineers that were working on it for months around the clock to satisfy Henry II's demand for a win. I have had a lot of the B cams in every kind of combo, and am rarely disappointed. The ramps on it were designed for longevity, and set the exhaust (sodium filled) down at a gentler rate than current cams would. Sure you can go with another grind that makes more power, but then you cant say "Its all stock". The MR is about the most powerful engine ever built "all stock", and can whoop ass on most anyting. You are fortunate to have it, so prepare it with great care. I have five MR's left, and am not wanting to use them in the racecars anymore due to the value. I will be thrashing other combo's that are not nearly as valuable/rare. The cost of these today is enormous to duplicate on the concours level. |
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