Topic: Intake manifold bolts
in Forum: C3 Engines
Already a Member?
Click Here to Login
Not yet a Member?
Click Here to Register for Free!
I'm replacing the intake manifold on my 72 LT-1. What is the best way to seal the bolts so they won't weap oil? My year calls for washers under the bolts. Do you put the silcone sealer on the threads or up near the top of the bolt where is contacts the manifold? Also, my bolts have a natural finish with the "M" on the head. All the catalogs call for black bolts (zinc phosphate I think). What's on your similar year Vette? I know this is a small point, but if you don't do it right, oil leaks onto the manifold.
SPONSOR AD:: (Our Sponsors help support C3VR)
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Seal the threaded part with Permatex Aviation Form a Gasket(Pt # 3H for a 4oz bottle w/applicator). Just a bit with the brush around the threads that will actually contact the threads in the head.
The bolts could be a black phosphate, or a natural steel. Just not "shiny".
The bolts could be a black phosphate, or a natural steel. Just not "shiny".
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Engines
SPONSOR AD: (Our Sponsors help support C3VR)