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So, finally getting around to replacing the intake gasket on my 302.
My factory manual says put a bead of sealant at the four corners but i was wondering since 1979 has anybody come up with additional steps I could take to stop the front and back seals from leaking?. Do I use any sealant or gasket goop on these for example?
i have done alot of those in my field, so heres a tip. On the intake ports and water ports (if you have them), use permatex gasket maker on both sides of the gasket. Its a brown color, and you apply it with a brush. On the ends of the block, i dont use the cork or rubber gasket. I use permatex orange, or gray. The gray is a bit more heavy duty. Put a bead about an 1/8 inch thick across the block. Set down your manifold, and torque it to 1/3 the specs, then wait 10 minutes, do this cycle till you reach your torque specs. Torque bolts in a cross pattern. I havent had any leaks yet doing it this way..Good luck
[updated:LAST EDITED ON 15-Apr-02 AT 10:13 PM (EST)]I also agree that you should torque it down multiple times over a period of time. When I had my 79 with the 302 I had to torque it down 4 different times till it stayed torqued. Also when installing the front and rear seals make sure they stay put when you tighten the intake down. Hope this helps
when installing silicone on anything, do not install more than what you need. For the end seal it doesnt matter too much but for instance if you was to put a 1/4" thick bead on something that has maybe .020" worth of surface irregularities, you will squish out almost all of the rtv, causing havoc later on when the leftover squished out silicone breaks away and get stuck in a thermostat and overheat your vehicle. Just remember that in some cases, more is not better.
Tony
'74 F250. 460, "beater"
'73 F250, "midnight auto" now a trailer
'77 F250, 460 transplantee, "Flamer"
hi
another reason for torquing it several times is when the sealent sets up it get harder and when you torque it down when it a little harder than it seals up all of the those nasty cracks. you also might want to ruff up the edges where the sealent is, it holds a little better that way.
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