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1 7/8 headers usually work with studs & I would use the studs if possible...With 2"& larger headers small headed bolts seem to work better but I wouls still try to use studs in the end locations...



Not much to add. On my 383 with 1-7/8" headers the studs worked great. With 2" headers some tubes would not clear the studs so I had to use bolts. On small blocks I alaways use the studs on the ends to prevent coolant leaks.