The best stroker 408-416-426-435 combination in stock 68 340 block

gregsdart said

All those motors i increased in size by stroking, and went faster, how did that happen? Simple. More hp, but about as important, more hp at a lower rpm with the same shift rpm. If you haven't seen a hp increase with stroking, something in the combo isn't right, probably starting with the cam. For instance you can't feed more cubes effectively with the same overlap duration.

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Where does the more hp come from ?

Energy cant be created or distroyed but only transformed.

If you take a 400 big block and bore it out to 408 and compare it to a 408 small block.
Internet wisdom says the small block with the longer stroke is better. But it leave out the fact the big block piston has more surface area applying more force to the crank. Balancing it out.

Now in the case of a 360 vs 408. Both have the same piston size so the same force is being applied to the crank and the longer stroke will multiply and make more torque but its traded from rpm leaving the same out come "hp". Since there using similar top ends chamber efficiency and heat transfer will be about the same. We know strokers with bad rod ratios have eat up hp due to friction. And maybe gives back in another way. But I don't see how a stroker can pull hp out of thin air ?

Theres alway a give and take that balances it out, no free lunch.

Basically for street guy your adding stroke so you dont have to add gear.

And of course this is all combo dependent.
Cam, heads etc.. will act different with different bottom ends some times giving an advantage to one or the other or even a draw.

But theres no inherent power advantage with stroker engines.