Steve-Os95GT said:
So let me get this right. You are saying that those type of numbers on a 302 are feasable but not recommended do to longevity with that type of strain?
BTW, thanks for all the help guys.
I'll hit some basics:
Think of your engine as a set of 8 syringes.
The 347 piston (plunger) travels further down in the cylinder (syringe) ...
...this is why it has the larger designation 347 vs 306 (cubic inches).
A syringe that travels further (with the same diameter bore) will pull in more ... in this case air and fuel.
Now look at piston speed ...
... a 347 has to travel a greater distance in the same amount of time ... 2500 rotations per minute (rpm) is 2500 rotations per minute no matter what the engine size ...
...This means a 347 piston travels faster in the cylinder than a shorter stroke 306.
A faster moving piston will pull air and fuel in with greater force referred to as "velocity".
Then we have intake port size ...
... these are the tracks that air & fuel travel though to make their way into the cylinder.
Think of these as straws attached to the end of the syringes.
Too large of a straw will make the incoming air & fuel "lazy" ... as in poor velocity.
Too small of a straw creates restriction ... not enough volume can be supplied as the engine desires ...
... Kinda like trying to suck up a McDonald's shake
You want these head and intake port tracks to be the appropriate size for the engine combination you are building.
A larger port requires a smaller engine (306) to spin faster in order to create enough velocity to pull and push the fuel in and out of the engine ...
Or a larger port needs a larger consuming engine (347) to keep the air from being too lazy
... Driving a street car around at 3500rpms all day long is
So to wrap this essay
up, a 347 will create more consumption (power) than a 306 in the same amount of time ...
That is the whole name of the game ... get more air & fuel in and out of the engine in the least amount of time ... that's why a top fueler is so beastly ... it is very good at doing this