I'm in the process of installing a Clifford header and intake on my 258 right now actually, can't wait to fire it back up.
After removing the stock exhaust and intake, I installed the new dual outlet header with no problem. It's the intake that I'm having trouble figuring out. Clifford told me to remove my centering pins and replace with 3/8 bolts or I will have a vacuum leak? When I tried to remove the pins with a vice grip, it seemed I would score the metal before turning the threads on the pins (I assume they are threaded)? This Jasper block has under 2k on it, so the pins shouldn't be seized.
Also, the header flange is much thinner than the intake flange. I had considered either building up washers, or welding steel stock onto the header flange. The guys Larry at Clifford advised against this. He told me to slide the 1/2" washer over to cover the header flange, and then put a 3/8" washer over the intake flange, and torque the header bolt, which I don't understand. I think my 3/8" washer has too large of an outside diameter to do this and I might need new hardware. Any others had this problem with the flanges?
1983 CJ-7 Laredo Jasper 258, Clifford intake/hedder, MC2100, HEI, MSD digital 6al. Warner T5, Dana 300, Dana 30/Ford 8.8 SOA, 33x12.50 Goodyear MTR
1999 XJ Cherokee Classic
2001 XJ Cherokee Limited