by WarWagon » Thu Jun 07, 2018 12:05 pm
Will need more than 1/2" then, you can double them up for an 1".
If you can afford it, Pyrogel or Aerogel is state of the art for insulation material.
Wrapped headers only rot out If they are mild steel AND get exposed to elements. Isolated wrapped headers will live.
Adam Knoll
Fairmont, W.V.
'65 Corsa 140 turbo DD
'66 Crown V8 Vair 5.3 LS
'66 Buick Riviera GS
'84 Isuzu Impulse Buick 3.8
'84 Buick Regal 3.8 blowthru turbo
'13 Suzuki SX4 6spd AWD
'19 Chevy Silverado 4x4 5.3 LT