Re: Heat riser valve...
It helps heat up the engine so you get up to operating temp sooner, for better mileage. If you want to delete it, you can just put a bolt all the way through with a nut on the far side. That way you won't have to tap the manifold. A bolt will offer no more back pressure than the shaft and straight flap would.
__________________
~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
|