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What do the specs say for your manifold RE: torque and pattern? Bolts do not matter whether they are ARP or Radio Shack Specials.
What matters is the torque and the pattern. Some manifolds require a different tightening sequence depending on MFG.
Once tightened warm the engine to operating temp checking for leaks, shut down.. then while engine is warm retighten to specs. Some say 3-5lbs more torque, others say to specs ... your choice.
I haven't warped an alum head or a manifold following this procedure and hve done it to MFG specs. But I'm not a mechanic either.
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