I am building another YB engine as a replacement for my Nissan Silvia...
I am lookign for 500bhp ish.... maybe a little more. The engine is a 2wd setup.

I have just managed to bag some Cosworth Racing std size pistons at a good price to go with my arrow rods.

I have been advised to get some Newmans cams.. BD16 inlet and I forgot the exhaust side profil but..... by concern is with the BD16 anyway...

Question, I know I will need to double spring the valves but will I have issues with the valves hitting the pistons. The Cosworth pistons have a bowl but no valve pockets??

If this is a problem, can I have the pockets machined into the pistons? Or will the pistons I have got just not be suitable??

This probably sounds dumb but I have never modified a YB to this extent before.... I am used to 2JZ GTE engines!