I have a 350 from a 74 Vette with cast iron heads and aluminum '70 LT1 manifold. The two center holes on the driver's side have poor threads using the standard length manifold bolts (one completely stripped, one feels weak). For now I have used longer bolts, but even they don't inspire me with a great deal of confidence. There is an air conditioning compressor braket that mounts under these bolts. Should I use the seemingly simple Heli-coil kits from Napa, or is there a better/more permanent way to fix this problem.

 

Use a heli-coil and when you go to put them in use some red locktite so that they won't push through and they won't turn in the hole when you fix it.

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89 GTA w/700r4w/stage 2 shift kit,2800 converter, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body, Ported Edelbrock centerbolt heads,Accell 30# injectors,holly afpr,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler,MSD 6A, accell coil,150 shot NOS. The new engine is in but I am still having some small problems.