One thing leads to another... mean 318?

rumblefish360 said

A larger bore has a direct impact on power. It’s not a lot though. Save the cylinder boring to keep the cylinder sleeve thick and strong. Bore as needed.

Me? I’m a retard wasting money. I’d check it out and see if I can get to a 4.00 bore and go there. Then build it like a 340. Them kill 327’s and 350 and 383’s all day long.

OH! Put the car on a diet. Under 2900 (with you in it) is a good thing!

Click to expand...

All true. Any time you can make the bore bigger, you can run a bigger intake valve. A bigger intake valve means you can port for more air flow. More air flow means more horse power.

Obviously, it’s a deep, dark rabbit hole to travel down if you ain’t careful because you can only get the port as big as the casting allows. And you have to have port cross section to feed the bigger valves. And so it goes.

And then, we decide more RPM is more power (it always is IF you have the induction system to feed the RPM) so we slam big honking valve springs on the heads to get that awesome RPM, and the pushrods act like wet noodles in there. So you have to upgrade them to baseball bat sized pushrods. Then the cheaper, small diameter wheel lifters start to fail with RPM so we update those and now we are ready to make some steam. Except the oiling system is lacking and BOOM...out come the rods.

And so it goes. There is more than one rabbit hole. And most of them are deep. And dark. And dirty. Trying to find the bottom of them is $$$$$$.