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Old 05-17-2013, 09:31 AM
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well if i had all the knowledge of how these things work, i could probably have a custom grind made special but i woundt know how to conjure up the numbers, all i would do is keep moving numbers around in the desktop dyno i found on the internet untill i found a nice curve. but this melling cam with my stuff looks darn strong so im trying to use it...so i am trying to mimic this cam for lack of know how on picking the right cam. i fed some of the run of the mill summit cam information into the program and they didnt look as strong.
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Old 05-17-2013, 10:45 AM
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i fed some of the run of the mill summit cam information into the program and they didnt look as strong. ill take some insight but i think this cam's a doozie. feel free to chime in with a good cam for pep and mileage with my setup. occasional towing as well but the boat i tow with my s-10 is a 17 foot fishing boat. got my tahoe for the cuddy boat. anyway blah blah blah my setup is as follows, 1984 305 .030 overbore flattop stock compression height pistons block resurfaced deck height comes out .022, l31 heads heavily resurfaced and the "low hangin fruit" has been been ground away and i went in with a stone and flappy wheel sander just cleaned em up a bit, diddnt lean on er too much. head gasket is .016 compressed thickness. intake is edelbrock 2116 performer dualplane, with quadrajet on top. dont have the exhaust headers yet but they will be 1 1/2 inch primary and the rest of the exhaust will be 2 inch true dual pipes with an H connector with some sort of flowing mufflers and tips dumped before the rear axle. the truck is a 1989 short box short cab s-10 2wd with 700r4 with lockup and a 1978 rear diff from a van with a detroit locker and a 3.08 gear setup. tires are 225-60-16's. i want it to go down the road at 65 with a low rpm, good gas mileage, and effortless stop and go torque. found the duration specs on the illusive merc cam they are 200-212 lift .400-.410 at valve 108 ICL and 112 ECL so sais the mercruiser bible on my base engine, however the lift does not match my actual measurements on the cam lobe. cam lobe measures IN .275 EX .280 giving me lift at .412 and .420. so using the specs given, with the lift i have personally measured, gives me a strong 305 engine with low rpm in mind. however it seems this cam is in question because it doesnt match the specs for the engine i started with. it may not be the factory merc cam after all. it is definatly a gm part though. sais GM30 on it. thats the only number on it accept it has the number 7 on it at the nose of the cam at the distributor end. maybe i should take the numbers that are in the program and have that cam custom ground for me?
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