Screw holes over the exhaust ports

zach0 · 02-18-2003, 05:41 AM

I was doing my tear down and repainting of everything and for the first time I noticed a tiny little hex screw above each of the exhaust ports right near where the exhaust manifold hooks up to. They run all the way into the port.

What is there purpose?

hobgoblin351 · 02-18-2003, 01:21 PM

If I'm not mistaken they are to release the sand after casting. They serve no performance porpose. You can take them out when hot tanking to get the passages cleaner. But make sure they are closed up tight afterwordsyou dont want them leaking.

02-18-2003, 05:41 AM	#1
zach0 Registered Member Join Date: Apr 2001 Location: Hampton, Virginia Posts: 227	Screw holes over the exhaust ports I was doing my tear down and repainting of everything and for the first time I noticed a tiny little hex screw above each of the exhaust ports right near where the exhaust manifold hooks up to. They run all the way into the port. What is there purpose?

02-18-2003, 01:21 PM	#2
hobgoblin351 Registered Member Join Date: Sep 2002 Location: NYC Posts: 245	If I'm not mistaken they are to release the sand after casting. They serve no performance porpose. You can take them out when hot tanking to get the passages cleaner. But make sure they are closed up tight afterwordsyou dont want them leaking. __________________ 1970 Stang Conv: en:Boss351 (balanced/blueprinted) mech cam(240*@.050/.540 lift) Scrw in studs/comp cams rllr rkr Mldn valves 2.19in 1.71ex ported polished cc'd hrdnd ex Keith Black FT pistons(10.25/1) Weiand Excellorator manifold Holley700 DP mech 2nds MSD 6 box and Dis Headers/2 1/2 inch duels tr: modified FMX re:9-inch/3.89 limited slip

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