Chevrolet small block 400 dished pistons. These inverted dome pistons offer lower compression ratios for use with regular grade pump fuel. Dished forged pistons are specially suited for turbo, supercharged and nitrous applications. SRP 139625 Chevrolet 400 forged dished pistons .030 oversized SRP 139626 Chevrolet 400 forged dished pistons .040 over sized We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.