Any C2 folks out there with TR, CP, or NAT grade 5 head markings on intake manifold bolts. My original 65 L75 has NAT markings.
Dobbins and Newton both reference them as a known GM suppliers. Newton (Corv Resto Guide, 1999 pg87) refers to intake bolt head markings of M, TR, CP & NAT. The 65 TIM&JG for L75 only refers to M, FP, or F only.
Also curious as to why the TIM&JG calls for different head markings between iron and aluminum intakes....hmmm.... Wouldn't Flint be utilizing the same bins for production of all SB motors?
thanks
Dobbins and Newton both reference them as a known GM suppliers. Newton (Corv Resto Guide, 1999 pg87) refers to intake bolt head markings of M, TR, CP & NAT. The 65 TIM&JG for L75 only refers to M, FP, or F only.
Also curious as to why the TIM&JG calls for different head markings between iron and aluminum intakes....hmmm.... Wouldn't Flint be utilizing the same bins for production of all SB motors?
thanks
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