Those pistons are standard, plain-jane, cast 318 pistons.... meaning they will be standard 318 low compression with a stock stroke crank. If you put a decently large cam in with these pistons and a stock stroke, the low RPM torque will be crappy to non-existent, and that is not what is desired for standard street driving. That is the problem with these and any low compression pistons.
Let's back up and find out what you want to achieve with this:
- 'Street' can mean a lot of things. Is this a daily driver, or a stout street cruiser? Or do you want something with a lot of HP? That will drive the direction of the parts selection.
- I take it that by saying street, you are not intending on racing this?
- Do you have a rough budget range?
- Do you have any option to switch away from a 318 to a 360?
Is there some particular concern over turning down the present crank? Doing that is a perfectly normal and OK thing to do, even for high HP build.
