Ok, I need to know what makes double hump heads better - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-29-2003, 09:16 PM
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Ok, I need to know what makes double hump heads better

What is it that makes double hump heads better than other stock heads, besides the fact that you can't bolt anything up to them (accessories)?

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Old 09-29-2003, 09:41 PM
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Better than what? they are antique heads built over 35 years ago! To work in todays world they need so much work done they are no bargain, and like you said there are no accessory mount holes on them. They were good heads in their day because they had better ports and larger valves than the stockers of the era. In todays world you are money ahead to buy any of the aftermarket heads, they are set up for modern fuel, they make at least 30 more h-power rite out of the box and you can have power steering and an alternator. When you are done with them they have good resale value.
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Old 09-30-2003, 07:10 AM
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some do have accessories holes, most dont though

heres the info on them.
http://www.chevytalk.com/tech/engine/SBC_Heads.html
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Old 09-30-2003, 07:47 AM
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They are some of the first production 'hi-performance' factory heads Chevy made so are the nostalgic choice. They have mildly unshrouded valves, larger ports and bigger valves, and yes most don't have accessory bolt holes, but that's a badge of courage too, having to be creative in bracket making. Yes, there are 'better' computer designed heads available today but a set of came humps still bring a twinged up my spine when I see 'em. Young'uns probably aren't the slightest bit impressed and would much rather have a set of tricked-out, throw-down, Vortex or Edelbrocks and that's fine too.
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Old 09-30-2003, 05:29 PM
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thank you for the feedback, I already have a set double hump heads, so its not a question of affording or choosing, they are what I'm using. My head are the 291 casting, with 1.94/1.50 valves. So I guess they have a smaller cumbustion chamber, and larger port volume and that is what makes them better.
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Old 09-30-2003, 05:52 PM
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Geat heads!
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Old 10-02-2003, 06:36 AM
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double humps

the last motor i used these heads on we still talk about
my friends dad wanted it built we had to do a lot of chasing to
get an alternator bracket we first tried a low slung loop
that speed shops sell how ever it kept braking the bolts off down near the harmnic ballancer we finally solved the problem
by top mounting the alt we had to weld a mount on to the headers and some cast brackets from a 63 it wasnt preety but it was reliable that engine is so sweet the forgies rattle a little till it warms and it pings unless they use hi octane we dont have super fuel any more 11.5 to 1 dont like unleaded good luck with your build
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Old 10-02-2003, 08:23 AM
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How can i figure the compression ratio? The chamber is said to be 64 cc and the piston comes up to about 1/4 inch shy of block deck. Flat top piston with little grooves for valves and its a 350 bored .030 over.
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Old 10-13-2003, 08:26 PM
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im wrong about the deck heigth so disregard that ^
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Old 10-18-2003, 01:22 PM
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If I remember right, B&M used a set of Dbl Humpers on there test mule engine. 350 bored 030 over, forged dished 8.5 to 1 comp pistons, steel crank, stock rods, blower cam, 6-71 blower and 2 750 Holleys. Got like 500+ horses at 6000 rpm's. I was impressed. Its just how much money and how fast do ya want to go. Id say Dbl's are fine for most street rides. HG
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