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Old 03-21-2014, 08:44 PM
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195s, as ericnova72 said, are good for the 406 till about 6000 rpm range.The next part will depend on the octane youre running . For a 406 I would think a compression ratio of 9.5 ,( iron heads) 10 ( for aluminum) with at least 91 octane should work. 93 take that to 9.7 and 10.2, respectively. and so on. 9.5 on 91 with a 282 ish duration, at 4 degrees advanced , on a 106 lsa , 5/8 long tube headers , 2.5 inch collectors , about 30 inches long, ( scavenging and semi-supercharging, Should give you about 450 pounds of torque. 9.7 , 93 octane, 285ish duration ,again 4 degrees advanced,same lsa, 3/4 headers , 3 inch collectors , same length , about 470 pounds. After this we either port the heads or go 200 cc . ( probably better to port , depending on head choice) , then 10 to 1 , 95 octane , 290 ish cam ( all else the same including headers ),490 pounds or more. These specs are based on iron heads, good combustion chamber, quench ( biggy ), piston design, flat tappet and enough lift at the valve, ( .525- .575 ish ). I assume open collectors, single plane, spacer, 750-850 carb, (750 holley hp comes to mind). You need a good reworked HEI or aftermarket with a rev limiter minimum. Aluminum heads , .5 more compression. . For all this, 160-180 temps are mandatory. ( good rad, thermostat, cold air induction, etc) Btw, roller cam, everything changes, Slightly. I hope this helps.
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