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Re: What's the difference 305 IROC engine and 305 truck engine?
I agree but I'm pretty sure the truck engines were non roller engines. My S10 motor is from a '90 truck and it's not a roller cam. 4.3's are all roller cams though. I wouldn't be surprised if the heads and intake were the same. I know the heads on 3/4 and 1 ton trucks are different due to valves and seats. For $150 you can't go wrong....
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 '89 S15 4x4 350TBI/700r4
restored body, paint,
3" lift, crane cam, vortec heads
'88 Iroc 350 carb, TCI 700r4, 380hp
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