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Oh you only ever want like 1.5 to 1.62 inch primary headers.
Heck I have 1.62 inch headers for my 454 that's been punched out to 8L and 11:1 compression.
1.75 primary headers on a small block are for like high rpm nitrous engines.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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