![]() I used 1978 305 2 barrel heads on a 357" yea I kept the 1.72-1.50 valves in them but ported them and stuck in a 280H cam into that 78 Nova and yes 4.57 gears TH350 and tunnel-ram with 2 edelbrock 1405 600 carbs. after the Peak HP at 5700 was realized the 112 LSA cam began to fall off in power rapidly. same closing as the same grind on a 106LSA.Ĭranking pressure was the same and power to 5700 rpm was the same. BE AWARE TO THAT THE 305 HEADS USE A MUCH SMALLER INTAKE AND EXHAUST VALVE, MOST ARE 1.72 INTAKE AND 1.48 EXHAUST COMPARED TO MOST 350 HEADS BEING 1.94 INT AND 1.50 EXHUAST. They all had 3.73 gearing as well, compared to my 3.42s, the 4wds had the stock optional 265 rubber. I do realize that the 4wds were heavier, but they did have 45 more cubes as well. a 112 LSA cam but with a very early closing intake valve. LO5 350 TBI were 190-210hp/290-300lb/ft torque while the LO3 TBI 305 were 170hp/260lb/ft torque. I had such a cam made years ago as an experiment in MPG. ![]() I would have the cam grinder close the intake valve early like grinding a cam on a 105 or 106LSA and if MPG was something I wanted i would have him push the exhaust lobe away to reduce overlap. ![]() If I had the 350 vortec heads and I am assuming they were 350 Vortec heads and I had to stick them on a 305 I would look for a cam that closed the intake valve very early to get some cylinder pressure back.ĭuration would depend on what I wanted to do with the engine.ģ600 lb daily driver I would probably look for a 212-218. The compression is not high on those and add a larger chamber head and you probably did not use a steel shim head gasket so that reduces compression even more.
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