The silver top motor is a 1G 6 bolt motor and the black top is a 7 bolt. There's really that big of a difference between those 2 heads and that 1G doesn't look ported. The 90-early 94 2.0GS (n/a) heads also had those big ports.

Normally the 1G head is swapped on a 2G block; it's seldomthe other way around. You really see the big benefits of those large ports when you're cranking up the boost.

 

so is a turbo head?

 

yea, one's just off a 6-bolt, and one's off a 7-bolt... which the 6 and theare referring to the flywheels

 

by the looks of it the eng behind is a vr4 eng and the one in front is evo the vr's came out with a few differert heads also the zr-4's had different heads to

 

WTF a vr4 has 6 pistons....im sure that the motor has 4 pistons i have the head off...vr4 what the heck are you talking about?