mach 1, my friend and i did an aluminum head swap on his car and reused the same head bolts after we finished he drove it to normal operating temp and went back and retorqued the head bolts there was a slight movement in his bolts. next i performed an aluminum head swap on my car but i used arp head bolts. when i went back to retorque the bolts there was absolutely no movement. He never had problems with his and i never had any with mine since the head swap but i think the fact that there was no movement is just enough cause to replace them, it definately couldn't hurt.
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GT-40X(58cc)heads, cobra upper&lower, FMS 65mm TB, 75mm Bullet, 24# injectors, 190 lph fuel pump, moroso cold air intake, BBK 1 5/8 equal length headers, flowmaster cat back, 1.7 cobra rockers, crane 2031, T5Z gear box, centerforce dual friction, mcleod bullet proof bellhousing, 3.55 gears, hurst billet shifter with over 193,000 miles. thanks to all who contributed
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