Gunk ValveMedic...?

I've tried those products and I have to say from first hand experience that they don't do ANYTHING. When I removed my heads, I still spent two hours with the wire brush and drill to get the caked on carbon off the pistons.
 
Zero Signal said:
I've tried those products and I have to say from first hand experience that they don't do ANYTHING. When I removed my heads, I still spent two hours with the wire brush and drill to get the caked on carbon off the pistons.
And you're suprised some mild chemicals didn't remove 10 yrs worth of carbon build up? Seafoam/B-12 does help improve gas mileage and throttle response and help remove/break up some carbon (also through the intake track). Seafoam helped my motor (126,000) and my buddys GTS (160,000) so they do help.
 
Zero Signal said:
I've tried those products and I have to say from first hand experience that they don't do ANYTHING. When I removed my heads, I still spent two hours with the wire brush and drill to get the caked on carbon off the pistons.
the carbon on the pistons just helps bump up compression :)