02-28-2024, 03:19 PM

70 Bonneville 70 Bonneville is offline

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Join Date: Jan 2024

Posts: 4

Head bolts loosening

I have a freshly rebuilt 455 mostly stock except .030 over and a new melling spc7 in it. Its not broken in yet only a little time idling and the 20 minutes cam breakin. Problem is it burns coolant and oil quite bad. Block and head are flat, replaced gaskets multiple times, torqued bolts to spec etc...
When I torque head bolts it works perfect, no smoke, no steam out of exhaust.
After 1-2 heat cycle, head bolts get loose and its back. Replaced bolts with new set from ames, did not help. What should I try?

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