I suspect that Sprintbird is on the right track, the valves might not be sealing well. 11 MPG is ghastly, perhaps the cam is slightly outa time from milling the head as well?? If the ring gap is a tad generous, I would hit it with the dingleballs & re ring it!
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"At no time did we exceed 175 mph.”
Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea...
Still have my 1st Firebird
7th Firebird
57 Starchief
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