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Old 09-10-2010, 05:14 PM
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Vortec heads

I have a 1966 chevy 327 engine and i was wondering if i could put vortec 350 heads on it. I have heard you can use the original intake. All i would have to do is drill out the holes in the intake. Is this true?

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Old 09-10-2010, 05:23 PM
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Quote:
Originally Posted by chevyc-10
I have a 1966 chevy 327 engine and i was wondering if i could put vortec 350 heads on it. I have heard you can use the original intake. All i would have to do is drill out the holes in the intake. Is this true?
Here is the warning from Sallee Chevrolet....
"Do not try to modify either the heads or the intake manifold to try to make the Vortec heads match up to a standard 12-bolt intake manifold. The ports will not match up. You must use a Vortec style intake manifold with any Vortec style cylinder head."
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Old 09-10-2010, 07:38 PM
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Quote:
Originally Posted by chevyc-10
I have a 1966 chevy 327 engine and i was wondering if i could put vortec 350 heads on it. I have heard you can use the original intake. All i would have to do is drill out the holes in the intake. Is this true?
The Vortec heads, at least those from the 10239906 or 12558062 castings, use a very different intake bolt pattern, additionally, the ports are taller. This makes mating them to non-Vortec intakes rather difficult. Some people have had success redrilling the heads to mate with non Vortec intakes. In some instances non-vortec intakes will seal their passages to the ports, but mostly the intake has to be welded up and machined around the ports to keep them from developing vacuum leaks between the valley and the ports and/or the upperside leaks atmosphere to ports.

One has to keep in mind that the cost of doing this or the cost of fixing engine parts damaged by doing this modification will far exceed just buying the proper intake. But if you're a good machinist and welder this intake to head conversion certainly is do-able and has been done.

GMPP has released a beefier, more expensive, intended for racing, version of the Vortec which does mate with earlier intakes. These are part numbers 25534421 and 25534431.

Bogie
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Old 09-11-2010, 02:49 PM
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Can't believe after all the years that Vortecs have been out this kind of question comes up. Simply amazing.
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Old 09-12-2010, 05:55 PM
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Vortec head, intake manifold and Vortec intake gasket on top of old style intake gasket. Note the difference in port size.
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Old 09-13-2010, 04:36 PM
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Thanks guys I think I will just buy the right manifold to fit it.
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Old 09-13-2010, 05:23 PM
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The stock car guys still have to use factory cast iron manifolds with Vortec heads in some classes. They use the FelPro 1255 gasket and put a large bead of Right Stuff on the top of the port to seal and stabilize the joint. I still have a jig to drill the old pattern into the heads. And, there is a marine 4 barrel, cast iron manifold made in the late 1990's that will seal properly on a Vortec. Neither is a great solution, but the benefit of the Vortec head in a class that requires stock, cast iron, unmodified heads is worth it.
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Old 10-26-2010, 04:25 PM
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Stock Vortec ports.
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Old 10-26-2010, 06:39 PM
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The bosses machined for better springs.
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Old 10-26-2010, 11:44 PM
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For a Cheap spring upgrade use 3100 V6 behive springs with retainers on the vortecs. A good pair of vortecs off a runner should be about $250-275 with springs at, you pull a part. My intake was $80.

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Old 10-27-2010, 10:44 AM
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spinn you are going to need some taller valve covers, also honey will increase the viscosity of oil so make sure to switch to winter weight 5-30 or something.

on the subject of vortec intake gaskets, the felpro MS98000T factory replacement "problem solver" gasket is IMO the best choice, reusable (really), set pins for gasket alignment, steel core, great sealing characteristics, check them out, little pricey but worth every penny, better than 1255 and no sealant needed other then the front/back rail
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Old 10-27-2010, 03:37 PM
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The .018" shim of the 1255 is nothing but problems. They will not seal for me on a daily driver appilication. The replacement seals fine.

Now is the time to go to the yard, in a month or so it will be frozen and snowing. All the fresh tow ins are gathered from the summer , good for the picking. Chances are you can grab 50-60 hp for $250 and not even change your 350's cam. Get dynomite low end up to about 4200rpm .

These are my C10 heads and the valve covers work fine for now. Some fabricated units would be Tall, but not in the budget. The engine has a small edelbrock performer cam, no contact.
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Old 10-27-2010, 06:02 PM
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The stock Vortec springs don't use a damper. The stock springs are rated at 80 lbs. For thirty two dollars a set you can use the better 110 lb springs that use a damper once the bosses are cut down.
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Old 10-27-2010, 06:13 PM
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This is the boss before the OD was machined.
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Last edited by V8&4spd; 10-27-2010 at 06:18 PM.
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Old 10-27-2010, 07:01 PM
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Are the 3100 springs a direct fit or do the heads still need to be machined?


Quote:
Originally Posted by spinn
For a Cheap spring upgrade use 3100 V6 behive springs with retainers on the vortecs. A good pair of vortecs off a runner should be about $250-275 with springs at, you pull a part. My intake was $80.

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