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Old 09-29-2003, 01:38 AM
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drilling vortecs?

somewhere i saw a jig to drill newer style vortec heads to fit old style intakes, was i dreaming? or is a blower manifold available for these heads? running a 6/71

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Old 09-29-2003, 01:44 AM
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althought the vortecs can be drilled to accept the older intakes, it`s not recommended, and I sure wouldn`t do it. If you look at the ports of a vortec you`ll notice they sit with a slight slant, the tops are closer together than the old school small block heads and this would result in the ports not matching up real good and likely cause vacuum leaks. I`m unsure if they make a blower intake for them.
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Old 09-29-2003, 05:58 AM
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Any good machine shop can do it... If they have a table made for clamping the head down it can be drilled... The problem is the 4 outside holes require that they be drilled very large (about 3/4") and cast iron pins installed, this give the extra metal needed for strength... I can vouch for this as I am running a set... Also most dont know it but the reg Vortec drop on style gastkets are .120 inch thick so of course you have to use a .120 thick reg style intake gasket too... Felpro makes these and they went a step better by adding the old style holes in the reg drop on style gaskets as well... The only other consideration is be sure and use 5/16" std. thread bolts to plug the drop on style bolt holes on the very ends otherwise you`ll find water will be running out... Also here is a pic of mine with intake installed... Sorry dont know if they make a blower intake for them yet but that would be very trick...
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Old 09-29-2003, 06:54 AM
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correct me if I'm wrong, but didn't the old schoolers take stock manifolds and mill them down to accept the blower on top? I've actually come across a few of these on ebay, where any old manifold was snagged, and they basically ripped the entire top off of it so a blower could mount up.

seems relatively easy in my opinion...then again, I don't think it's as effective as one of the after-market manifolds that are available for purchase...but then again, what is the motor going to be used for? Going to mill-way may be worth it
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Old 09-29-2003, 09:22 PM
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i knew about the thick gasket have been told that it goes a long way on the port matching. lots of folks here say a lot of good things about these heads including 450 usd per set, i haven't found them that cheap yet but the aftermarket starts at about twice that. just trying to explore all avenues before i plunk my hard earned money down. i have a blower intake for old style heads and i hadn't thought about cutting up a vortec intake, has anyone here tried this? i guess i could port match my intake to the heads but is it worth it? do these heads flow that much better than 882's?
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