These will clearly fit your 4.070 bore without any concern other than the bore size being a bit larger than you need. Its only about .040 per side however. Just drops compression a bit with that bore size, but makes it back up with the thinner gasket.
The " old red" gaskets were in fact Detroit gasket, not been available for years other than left over stock.
Like I said, I am 99% sure these are a copy of the Corteco gaskets, which were also tied in with ROL gasket company and I believe made now in Mexico. They arent a bad gasket.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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