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Old 11-01-2008, 02:20 AM
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heads?

OK i have this sbc 350 bored .040 over will '91 vortec(?) heads work good on this block with a "rv"(?) cam in it

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Old 11-01-2008, 03:21 AM
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There are no `91 Vortec heads. Vortecs were released in `96. However, the name Vortec first appeared in the 80`s on chevy trucks and many engines even had the name on the valve covers but these had the horrible swirl vane 193 castings on them. Many have been taken by that, and many have sold the swirl vane heads as Vortecs just because of the name. Real vortec heads are unique, they have 8 intake bolts instead of the classic 12 and they have heart shaped combustion chambers. The casting numbers for Vortecs are 906 and 062. Always do your home work before you buy, if not your asking to get taken. I see so many on ebay selling "camel hump 302 DZ heads" it makes me sick.

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Old 11-02-2008, 09:08 PM
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I think quite a few people are misguided when they see center bolt valve covers... they automatically think "vortec heads"... not so. As DV said... 906's or 062's... if you are a 'symbol' identifier... the symbol of vortec resembles... /\/\/\ - the 'sawtooth'
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Old 11-04-2008, 08:58 AM
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Ya I didn't think they were vortecs thats just what I was told the vortecs come on an LS block anyway right?. So my stock '70 something heads would be better than those '91 heads? And so that would mean I would be better off making an adapter plate to put the TBI on my edelbrock intake?
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Old 11-04-2008, 11:56 AM
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well there are 'vortec' LS engines but cylinder heads from LS series engines and Gen II's are not compatible, totaly different blocks.

70's heads? Uhm... I really don't know, it depends on your castings... 041's, 186's, and 414's, and 492's all good for very early 70's... other than those I don't think a decent head has surfaced.

Making an adapter... I don't know about that either... if you think you can shoot for it.
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Old 11-06-2008, 05:47 PM
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Ok so I should take the intake to a machine shop and have them ream out the center holes in the tbi intake? The heads I have are: head #1 333882 74-80 350/400 76cc chamber head #2 3998993 72-73 307/350 75cc or current 350 goodwrench hecho mexico 75cc chamber are these good or bad? They have had work done to them not sure what I bought the motor with them on it the block is the one mentioned above so should I look for something better?
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Old 11-06-2008, 06:09 PM
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Quote:
Originally Posted by chevyman420
Ok so I should take the intake to a machine shop and have them ream out the center holes in the tbi intake? The heads I have are: head #1 333882 74-80 350/400 76cc chamber head #2 3998993 72-73 307/350 75cc or current 350 goodwrench hecho mexico 75cc chamber are these good or bad? They have had work done to them not sure what I bought the motor with them on it the block is the one mentioned above so should I look for something better?
Given the choices there, dump the 882's, they flow decent but are crack prone.
Use the 993's. We use them and they are very popular in circle track racing where we are limited to the open chamber heads. Flow is decent as long as you have the bigger valves, and you can mill a bunch off them if you want to make more compression, i.e. I have a set on the shelf that I just milled down to 65cc. You'd need to mill your intake or the intake surface on the head to use something like that, but my point is they are a solid, durable head that flows decent.
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Old 11-06-2008, 06:48 PM
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If my memory serves me, the 882's from 1975 (with the scalloped edges on the side of the exhaust manifold) and later are crack prone but the 882's earlier than that are the heavier castings and are not susceptible to cracking.
Terry
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Old 11-07-2008, 09:58 AM
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OK i'm not sure if my last post was clear the one of those heads is one side of the motor and the other is on the other side they were a pair on the motor when i got it now if the 882's are crack prone then that might be why my motor started running crappy ok so how about this set of heads and this is a set the numbers are 462624 both heads have the same number so would these be better
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Old 11-07-2008, 10:03 AM
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Quote:
Originally Posted by chevyman420
OK i'm not sure if my last post was clear the one of those heads is one side of the motor and the other is on the other side they were a pair on the motor when i got it now if the 882's are crack prone then that might be why my motor started running crappy ok so how about this set of heads and this is a set the numbers are 462624 both heads have the same number so would these be better
My experience with the 624's is they are crack prone too.
They don't flow well, and often have the 1.72 intake valves.
On the positive side, they make a good door stop!
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Old 11-07-2008, 10:56 AM
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Lol ya thats about what i thought about the heads i have so i'll look for something else thanks for the advice everybody
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Old 11-07-2008, 01:26 PM
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What is it exactly that you want the motor to do? Are you locked into the TBI or could you swap to carburetor. How much horsepressure are you looking for and what is your budget?
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Old 11-09-2008, 10:45 AM
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well i started a new thread on that and i have a carb now but actually want fuel injection so the tbi is what i got cuz money is a huge issue
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