I have a military rebuilt GMC 302 with .020 flat top pistons, yet the head is a "477" head designed for dome top pistons.
Will there or is there a drop or significant drop in compression if a head that is designed for dome top pistons is used with flat top pistons?
- What will be the most noticeable effect if compression is lower using the 477 head with flat top pistons? Harder starting?, loss of fuel efficiency? poorer ignition?
Should I be searching for the flat top piston head? and replace this 477 head with an 819 head?
The engine will be used in a one ton truck for street use. Not a performance or modified engine. Snow free or warmer temp driving.
Last edited by Hunterdude; 02/18/20 02:00 PM.
