Originally Posted by hcompton
Vortech heads for the most part are not that great. There is one vortech casting that beats the 461 or 461X heads. And one aftermarket vortech casting that is better. all the others are pretty bad. If you dont have that one then use the 461's.
Ported for ported the 461's are better. Stock they are good for 350-400 hp just like the good vortechs.
But in your case i have a set of 461X heads on the orginal 327 in my garage. I went and purchased procomps for 600 bucks. In your case i would suggest you sell the 461's to a fool on ebay and buy aftermarket aluminum heads. The 461 go for more bucks than some of the cheap aluminum heads so why not get a good set.
If you are dead set on vortech get the good ones from the gm performance catalog. Not the ones on ebay for 50 bucks they will suck just as bad as any stock head. The best vortechs for the street are pretty good. they do make more power than the stock 461 but only a few ponies nothing your going to miss. if the 461's are bolt on ready then run them if not go with good heads not ok or pretty good or they worked on my boat. Good heads will make the best bang for the buck not free or cheap ones.
461 X heads came int he 300 hp 327 back in the day. They do work ignore the vortech trap. Also vortechs dont have the same bolt pattern for the manifold as older chevy heads do.
This has been gone over several times on this forum. Here are the correct vortech casting numbers.
5.7 Vortec Casting #s Myth 062 & 906
I had thought the whole "only one good Vortec head" bs had been laid to rest a LONG time ago. For those who don't know, some wag at CHP magazine (IIRC) started this myth shortly after the Vortec heads came out (and before much was actually known about them, presumably). This myth has been rebuked many
times by dyno and flow bench tests, track testing, etc. etc. but still surfaces every so often.
Here are the FACTS: The ONLY significant difference in c/n 906 and 062 L31 production Vortec heads is the 906 head MIGHT have a hardened exhaust seat insert as opposed to an induction hardened seat. The insert MAY cause there to be a slight lip where the insert and head meet. And there might be a single angle seat instead of the three angle seat used on the induction hardened seats (this has to be verified). These differences certainly do NOT make the 906 w/insert a "bad" or "poor flowing" head. In fact, there are boat builders who prefer
the insert seat heads.
If the Vortec head as used on production vehicles has a problem, it's cracking- NOT flow. Some cracking isn't because of the heads per se
; they cracked because of other shortcomings of the engine.
IMO anyone who cannot get better performance from a Vortec head than a fuelie head- all else being equal
- needs to work on their engine building skills.
• Vortec heads