A standard HSS bit will work.
They are the 4 large holes on the outside of the head where the headers or exhaust manifolds go.
Daniel S. Freed has written: 'Instantons and four-manifolds' -- subject- s -: Four-manifolds - Topology -, Instantons 'Five lectures on supersymmetry' -- subject- s -: Supersymmetry
exhust valve and guid sufficiant ply./exhust valve improper set/advance iginition timing.also locked muffler.fuel,gas, tomuch high flow. ahmed mirza neduet
Check the intake and exhaust manifolds around the EGR valve. There may be enough carbon buildup to prevent free flow of gasses.
Electronic carb, air injection exhaust manifolds, air injector pump, EGR valve, purge canister and valve, catalytic converter......I think that's pretty close to all of it.
Daman Products Company Inc. located at Mishawaka, IN 46545. It is a design and manufacturer of hydraulic valve manifolds products throughout the world.
The pcv valve is in the dirvers valve cover top center and the 02's are in the exhaust close to the manifolds they are a pain to get to and very hard to see with out a lift. there are 2 sensors 1 on the driver side an passenger side. good luck
1997 does not have EGR. The 1995 and before manifold (with EGR) is different that a 1996 or later (with out EGR).
if the spark plug wires go down the middle of the valve cover, it is DOHC. The Intake Manifold will also say Duratec. The OHV motor will have the spark plug wires connecting on the bottom of the head near the exhaust manifolds.
Calculus on Manifolds - book - was created in 1965.
Exhaust manifolds should be covered by warranties.