318 question
Why does the OP need new pistons if he's already at 9.2:1?
It’s a question of, “IF” they’re needed IF they’re worn out.
The OP maybe under the impression that 9.2-1 isn’t enough.
That would be wrong for the goal. I just suggested a replacement with more compression.
AJ believes this is needed for everyone including other items like a way to control your foot in order to prevent spinning tires out of control.
It’s not needed but I’d suggest one for everyone if a manual trans is involved and you like shifting at high rpm and/or racing.
...but no one will seriously discuss a "one step above stock" cam?
I’ll entertain this, for sure!
But let’s get to exactly on what is one step above stock.
What’s your take? How much more duration?
Considering the size of the stock cam, AKA Toothpick small, a one step up cam is still small and may not provide enough extra air/fuel charge to meet the goal. This is totally dependent on the rest of the parts being used.
Should the OP stay with the stock heads as cast, the cam will be required to be larger in duration. This is because the stock head will only allow so much breathing. If the head moves FFF amount of air, then it will need to have the valves open longer and with more lift to take advantage of its capabilities. If another head flows more air or the stock one is ported to flow more air, less cam can be used.
With this (known) in mind, what do his heads flow and how much cam is needed in s the question. This is also as I said dependent on the rest of the engine.
One step above stock is not enough IMO.
What cam would you suggest?
