305 vs 350 heads 229125-305 vs 350 vortec heads

The 305 heads I used had a smaller combustion chamber than the 350 heads that were on the motor originally so it bumped the compression a little The downside was the heads also had smaller valves so that was a bit of a disadvantage I think there are two sizes of intake valves used on some of the 305 heads from that era Some have 172 intake valves and others

305 vs 350 vortec heads- different pistons, and 350 cam in the HO version 190hp vs the 145 and 150hp of the LG4 HO= L69 same block and heads in both ive owned lots of both and they always run good most ppl who complain about 305 engines have one thats dead tired and about to die, in which any size of engine like that is gonna run bad and be bad305 Vortec heads 5 or 059 casting 184 intake valve 15 Exhaust 350 Vortecs 906 or 062 casting