I changed mine over to headers about 10 years ago. Used my acetylene torches and got each bolt red hot then let it cool for a minute. Each bolt came right out. Are you sure its a blown gasket and not a cracked manifold?
1990 GEORGIE BOY 28' 454 4BBL, TURBO 400 TRANS,
CAMPING: WHERE YOU SPEND A SMALL FORTUNE TO LIVE LIKE A HOMELESS PERSON.
Brian in Michigan wrote: Are you sure its a blown gasket and not a cracked manifold?
At this point does it matter? Either way it has to come off.
Well, yes, it does matter. If the manifold is cracked, replacing the gasket won't fix your problem.
A Simple Act of Caring Creates an Endless Ripple Dennis and Debi Eleven Years Full Timing
Monaco Executive M-45PBQ Quad Slide
525HP Cummins ISM 6 Spd Allison
2014 Chevrolet Equinox LTZ W/ ReadyBrute CLICK HERE TO VIEW OUR TRAVEL BLOG
Didn't bother using any fluid as it's mounted with bolts and no way to reach the threads behind the manifold. Bolts came out without any issue. Which gasket should I use? This metal GM gasket for about $20?
Or these composite style aftermarket for half that for a pair?
Turns out those are the wrong gaskets. This manifold has round ports and those gaskets are oval. Looks like I need a Fel Pro 1412 or Mahle 95100SG. Any idea what heat riser gasket it would take? The distance between bolts is 3 9/32" and the hole diameter is 2 9/16" but I came up empty.
After restoring old cars for 35 years the best penetrating spray I found is Kroil.
Several shady folks here I would never buy anything from. I just hope they get treated the same on their next purchase.
Eddie
03 Fleetwood Pride, 36-5L
04 Ford F-250 Superduty
15K Pullrite Superglide
Old coach 04 Pace Arrow 37C with brakes sometimes.
Owner- The Toy Shop-
Auto Restoration and Customs 32 years. Retired by a stroke!
We love 56 T-Birds