I built my own spacer out of a 1 inch block of
T-6061 with a 55mm bore, than portmatch it with a 4.0L TB and the Intake manifold.
It Did Help. Hell Ya. I can hold 80+ on the freeway in 5 gear. this is on a 92 yj 2.5L with 140,000 miles
Over at 4 bangers we had a guy make 4 different size and he like 1 and 1.25 the most.

<small>[ July 09, 2003, 06:24 PM: Message edited by: OILsmoke ]</small>