i heard u cannot fit PCT or P73 pistons in a LS if u are using a nonvtec head. if it is true, which pistons will fit? PR3? P30? i'm lookin for the highest possible compression from a stock piston

anythin really with a 81mm bore really require no modification

All OEM B-Series Pistons fit except the B20's. B16,B18A/B,B17,and B18C's are all 81mm bore. B20's are 84mm bore.

thanks for clearin that up. i heard many different answers before i came here and i wanted 2 make sure im not making a big mistake

if you want to use ctr, then modding will need to be done. I done a build with ctr's piston and the rod had to be machined in order to fit the ctr pistons.

i just wanted to kno if it'll clear the ehad. someone from b20 told me it wont fit.

here's my plan of attack: B16A1 cable trans, B18A1 PR4 block, PR4 crank, PR4 rods, PR3 pistons, B18B P75 head & cams, with crower valvespring kit, AEM adjustable gears, P75 intake manifold, 65mm t/b, hytech replica header, 2 1/2" exhaust, full fuel system and a Hondata S300 ECU.

hopin for 170 whp- or 200 at the crank

upgrade the intake manifold unless you getting it ported. Is the head gonna be port and polish or are you using a bone stock head beside teh upgraded valvetrain. The ctr will fit it's also 81mm bore and it also come oversize too. Like i said you will have to do some machining in order to use it.

forgot yes it will clear. If your unsure clay the motor, this is time comsuming.

I've got P72's in my B18A1 block. It up the compression a bit, but not insanely....