very on the 67 i had. I could ''feel,'' a slight power loss or atleast i thought so. It may have been sound related too? I would swap it on a shows and drive with an open element and chrome lid. The surface area of the stock element is roughly 1/3 a standard 14x3 element. It has to have some effect in my opinon
i do like how they look though.
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1969 carousel red firebird 455, richmond 5 speed
1964 540 gto
1971 lemans sport convertible
1972 Maverick under slow construction
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