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I remember, not one to drop on one's foot.
The insulation as mentioned reduces noise AND doubles as a heat shield underneath the carb.
Even if you block the exhaust crossover,I would still wrap household insulation on tinfoil and put on top of the turkey pan.
I also paonted the non-sealing surfaces engine color .
FWIW,this is under my Edelbrock Performer intake.Note the crossover has been blocked and I use "The Right Stuff" by Permatex.
Big Block Intake Manifold Insulation Dodge Plymouth Mopar
Give this a snoop.
They were for noise reduction. What good would a heat insulator do when the heat riser pathway ran above the insulation?
But then again,every little bit helps.
Stock 383 2 bbl to 4 bbl swap.
Yeah I'm agreeing! See post #9
Got the valley pan in with the heat riser block off.Want to bad of a job. Trying to get all the bolts back in for the intake took some doing. I am sure it was my technique or lack thereof and the blazing heat! Went for a 25min cruise and no leaks..... hope it helps.