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Old 12-02-2007, 05:28 PM   #1
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Question Are Double Hump heads Worth keeping?

I have a set of double hump heads that are on the engine I got in a trade. The engine threw a rod so Im considering my options...1)purchase new shortblock and reuse heads with new cam, 2) sell heads to fund new stroker longblock that would come with everything from intake to oil pan. The difference in price is $500-$700.
The casting # on the heads is 3991492 which going by what ive read on hot rodder mag. is the best one of the double hump heads and typically came with 2.02" and 1.60" valves and were 64cc heads with 160cc intake runners.

So should I keep these and use on a new bottom end or should I sell them? If I sell them How much could I get for them?
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Old 12-02-2007, 07:09 PM   #2
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The double hump heads ported make good power. it depends on what you are wanting to do but I have seen a car with a ported double hump go on a 383 go just as fast as when they changed them for the iron eagle 2300cc runner heads on a lite weight Chevelle that was set up for drag. 11.0's on both sets of heads
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Old 12-02-2007, 07:34 PM   #3
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The heads are still mounted and still in the car so I have no way of knowing what has been done to them. What I want is a solid small block that will put down around 375+ to the wheels but not be way too crazy if I have to drive it to work. If I sell them how much could I get for these?
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Old 12-02-2007, 08:10 PM   #4
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Sell them on ebay, especially if the dates match and are in from the early 70s or older, people pay stupid money for these for some reason, enough to help pay for a decent set.
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Old 12-02-2007, 09:14 PM   #5
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^^^ I agree. Sell the 492s to the numbers matching crowd. There are so many good flowing aluminum heads out there for $1,000 and up. You could spend $500 or more to update the 492s or sell them for $200 - $300 and buy new, lighter, better flowing ones.
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Old 12-02-2007, 10:10 PM   #6
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if your on a budget, vortecs blow them out of the water and you can get modified ones for cheap.

but aluminum is better in just about every way if your willing to spend a little more. However they do make alumiunum vortecs also for not much more than the cast version.

i sold a pair of 462's a couple months ago that had alot of port work done to them for $200. Also sold another set of 462's that werent assembled for 100 to give you an idea what they are worth.
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Old 12-02-2007, 11:15 PM   #7
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Hell, i just sold mine, be a follower
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Old 12-03-2007, 03:43 PM   #8
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IMO, keep them. You are not gonna sell those 492 heads for the same price as vortec heads + the additional expense of a vortec specific intake unless you get someone (ME + others) to start digging through the for sale dumpster on the net for you. Just say when and I'll start diggin' if you get the "For Sale" itch...

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Old 12-03-2007, 06:26 PM   #9
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Quote:
Originally Posted by 8a8mfh View Post
Sell them on ebay, especially if the dates match and are in from the early 70s or older, people pay stupid money for these for some reason, enough to help pay for a decent set.
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Originally Posted by Chevy406 View Post
^^^ I agree. Sell the 492s to the numbers matching crowd. There are so many good flowing aluminum heads out there for $1,000 and up. You could spend $500 or more to update the 492s or sell them for $200 - $300 and buy new, lighter, better flowing ones.
Yep, sell'em. Buy better ones.
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Old 12-04-2007, 09:33 AM   #10
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If you dont want them I DO!!!!.... I love camel humps... PM me w/ price
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Old 12-04-2007, 10:29 PM   #11
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Ive done some research on these and it seems that for my budget right now it might be the way to go. I can get some pretty decent numbers out of these before I have to spend an extra $1000 on aluminum heads. Im trying to get back on the road by summer and I have a son on the way so Im pretty limited on my options. Im also not looking to make 10 sec passes on these even though one of our guys in safbody has done it.
I could always change them out later when im ready for bigger numbers. I have yet to get a chance to pull them off so they might not even be salvageable. Ill post up the findings as soon as I remove them this weekend, I hope.
I appreciate everyones input on this though. keep the ideas flowing!
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Old 12-05-2007, 05:16 AM   #12
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I know a freind that has personally gone 8's in the quarter mile with a set of 492's. They had an excellent port job done to them, but on a bore size less than 4.125" I would use them on a hot rod. The cost of rebuilding them would be alot less, the only thing that would sway my decision would be for the need of acessory bolts on the cylinder heads.
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Old 12-05-2007, 05:26 AM   #13
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Quote:
Originally Posted by camaroboricua View Post
Ive done some research on these and it seems that for my budget right now it might be the way to go. I can get some pretty decent numbers out of these before I have to spend an extra $1000 on aluminum heads. Im trying to get back on the road by summer and I have a son on the way so Im pretty limited on my options. Im also not looking to make 10 sec passes on these even though one of our guys in safbody has done it.
I could always change them out later when im ready for bigger numbers. I have yet to get a chance to pull them off so they might not even be salvageable. Ill post up the findings as soon as I remove them this weekend, I hope.
I appreciate everyones input on this though. keep the ideas flowing!
Engine kits dot com sells aluminum heads for 700$. Sell those for 200$ and you will be buying the aluminum ones for 500$. You will be putting 200-500$ in machine work in those cammels in the machine shop.
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Old 12-05-2007, 04:37 PM   #14
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I bought a set of vortec heads off car-part.com for $240 to my door. They were like new I had to spray them off with brake cleaner and compressed air and they were ready to bolt on. Then the perf rpm intake, had to buy an intake anyway.
Put it all in a 1987 S10 and ran 12.4 in the 1/4 mile on street tires.

NOW see how far $240 goes getting those 492's rebuilt.

I made the mistake before with a set of 993's, ran them so long I had them rebuilt three times. I could have payed less for a good set from day one if I had just thrown them in the garbage.
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Old 12-06-2007, 08:51 PM   #15
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Quote:
Originally Posted by ZONES89RS View Post
Engine kits dot com sells aluminum heads for 700$. Sell those for 200$ and you will be buying the aluminum ones for 500$. You will be putting 200-500$ in machine work in those cammels in the machine shop.
Have you bought from them before?
Im always nervous about buying from new companies(new to me).
Is there anything that I would have to do diff if I went with aluminum heads?
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Old 12-06-2007, 08:59 PM   #16
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Only thing to worry about aluminum is over torqing to the point of stripping the threads.


RHS has a great rep from the magazines i read and capmsmokey has a set that he runs the dog snot out of, i wouldnt worry.

The site i mentioned has been around for a long time, no one i have ever seen complain about their products so i am sure they have great custmer satisfaction.
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Old 12-06-2007, 10:15 PM   #17
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Default Are Double Hump heads Worth keeping?

Well the ones you speak of can come with 194 valves as well. The 461x and the 186 small camel humps are more rare. With the technology out these days you would be hard pressed to find a set of heads from the sixties that can match flow numbers. And beyond that you have to look at combustion chamber designs, cylinder filling properties. And the fact that those don't have acc. bolt holes means you can only run a short water pump set up. Unless you are restoring a muscle car and these heads have proper date codes, there is no reason NOT to step up to a newer design. IMO!!!!!

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Old 12-07-2007, 06:16 PM   #18
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I was able to get the pass side head off and it has the 2.02, 1.60 valves. This set of heads has the acc. holes I need to use my serpentine set up. My uncle knws the owner of a machine shop that would rebuild these and port and polish them for me too so if he can hook me up with a good enough deal I might just keep them. I have yet to find out if the drivers side is still good though.
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Old 12-07-2007, 07:18 PM   #19
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Between machine work, porting and valve springs and installation you might be in more than you want to be.
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Old 12-08-2007, 01:36 PM   #20
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Find some old guy to buy them. They want them for the nostalgia effect. They'll usually pay a pretty penny for some. The old guys rebuilding 55-57 Chevys are a good crowd to try and sell them to.
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Old 12-08-2007, 01:36 PM
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