If u can find them I would locate a set of the older castings as they are much more durable. To save ya time go to your local reputable machine shops and see what they've got. Here is a few #'s ta look for.
3932441 67-79 1.94/1.50 250 & 255 76 CC Chambers Intake flow 152 CFM Exhaust flow 93.2 CFM These have flat seat spark plugs.
3973487 68-79 1.94/1.50 & 2.02/1.6 165-330 76 CC Chambers X casting has 10 more intake cc volume
3998993 68-79 1.72/1.50 & 1.94/1.50 115-175 76 CC Chambers Intake flow 150.8 CFM Exhaust flow 91.1 CFM Heavy duty casting. Small plug.
333881 1971 / 76 350 165, 270 hp
462614 1977 / 79 305 / 350
[This message has been edited by 71 Camairo (edited 04-18-2000).]
If you are building a street rod, I can't think of a single reason to use factory heads unless they are free. There are SOOOOOOOO many good aftermarket heads out there that kill the old GM heads. It amazes me how many people spend good money modifying the oldies. If you can do it your self, great, but aftermarket heads are light years ahead of the stock castings, and are a much better starting point. You can get into a good set of World Products Torquers for about $350, or Sportsman II's for about $550. If you want performance at a good price I would strongly recommend staying away from stock heads. You don't have to spend a bundle for good aftermarket heads.
Shawn, would the same go for big block heads?
I'd love to run aftermarkets, but I can't seem to find anything for less than $1500.00....I've got 4290's on my 396, and I'm happy with them, but I'm not sure if they've been worked or not. Plus, I'd love to shave some weight, and I know the stock iron heads would be an easy place to start. Does your statement about the GM heads also include the big block castings? KZ
consider the vortec heads.
at $400 a pair + the intake ($200) $600 total
you can get a set of assembled heads that flow really well right out of the box.
Im running them on my 69 right now
they have 64cc heart shaped combustion chambers and are completely assembled
if you have a high lift cam you may want to change the valve springs.
I know you are going to get a lot of posts saying that the heads are lightweight castings and are prone to cracking, so far I havent had any problems with them yet. I also know of a few people running them with now problems what so ever.
my second choice (more $$$$) are the GM fast burn heads
From everything I read and see, the Vortec heads give the most bang for the buck. Can't be beat in the cast iron line of heads. Watch the valve springs carefully though. I'd rather have aluminum, but the money gets to be a problem quick with these. New heads might save money in the long run too, over the machining costs for used.
I should qualify my remark about price, Sorry. The numbers I've stated is what I see them for in my local paper and at swap meets. They seem to go for about half of what they sell for new, which is typically $700 or so for the set. I see lots of Sportsman II's around that people seem to be trading off for something else. As for the BB parts, not sure about cost. I just know that everything for them is very spendy...
71camairo, you can get the Vortec heads through your local Chevy dealer. also check the posts in the engine/drivetrain area for posts about what year chevy trucks had these heads. you can save some money and get them from a salvage yard.
I would say that it certainly DOES NOT apply to big block heads. My Edelbrock Performer RPM heads were 1,500.00 and all the other aluminum types were roughly the same price when I bought them. I have always had small blocks before my current 396 and I would say that big blocks cost at least 2 1/2 times as much as their small block brothers to build. The parts availability is less and therefore more expensive. People seem to want to charge more in terms of labor too, don't ask me why, it just happens.
Guys, Burt Greenwald Chevrolet (Ohio) had the best price I could find on the Vortec heads at the time I bought them. They came on 96 and later Chevy trucks, for those who want them used. The durability thing, I think, is a result of some advertising copy in the GM Perf Parts catalog. It's trying to sell the heavy, low-flowing bowtie heads on durability (they're heavy and don't flow as well as Vortec heads, so they must be more durable). My truck's heads're fine. I'll let you know how they do on my 67 ragtop once they're in. I haven't heard of anyone having any problems. Remember, they're cast iron, production truck heads. Steve Laabs
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