Quote Originally Posted by 06 4.8 View Post
Well I had a blown up 1989 4.3 with missing pistons laying around my house and a friend of mine asked what I was doing with it. I was going to give it to him but he offered his 1 inch throttle body spacer for it. I put it on and actually noticed a difference on top end. Honestly what I like most about it is the cool whistling it makes around 1800 rpms.
The only reason you saw any increase was because your motor had throttle body injection. I had one on my 87 with a 5.7 and it helped out also bt that was also TBI.