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Old 01-16-2011, 12:21 PM
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69 stingray head mystery

So im looking at a new set of heads since mine have developed some cracks. I got a call from a guy saying he had a set of heads off a 69 stingray with a 350 in it. The head casting number is 37035280. Of course this is all info he has given me. Does that make sense to any body, i havent heard of these heads before. Any help is appreciated
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Old 01-16-2011, 01:09 PM
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I could not find that number, closest number I could find was, 3703523, for an 265 sbc from 1955. I would have him check his numbers again.
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Old 01-16-2011, 01:10 PM
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I can't find anything on that casting number. One problem is that it has too many digits for a head casting beginning with the number "3", it should be only 7 digits. I tried taking a digit out in different places but still couldn't come up with anything close to that number.
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Old 01-16-2011, 05:10 PM
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If they are pre-72 heads they are not compatible with modern fuel.
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Old 01-16-2011, 08:27 PM
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I must say that is a very good point you bring up. I would bet there are loads of cars running the roads pre 72 that have never had the heads rebuilt for the modern fuel. Makes me wonder how many do not realize that. So often I see folks chasing the fuely double hump heads and never is a word mentioned about them being updated, I'd forgotten.


Good one BOBCRMAN@aol.com
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Old 01-16-2011, 09:23 PM
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Personally, unless I was doing a numbers matching restoration, I would buy brand new heads for any Chevy build I was considering. For what it costs to have an old set refurbished(guides, seats, valves, springs, retainers, locks, machine work), you can buy a better flowing new head for less money. Double humps were great for the time that they were first made, but knowledge and technology have created far better offerings.
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Old 01-17-2011, 04:06 AM
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Quote:
Originally Posted by luckynumberslevin
So im looking at a new set of heads since mine have developed some cracks. I got a call from a guy saying he had a set of heads off a 69 stingray with a 350 in it. The head casting number is 37035280. Of course this is all info he has given me. Does that make sense to any body, i havent heard of these heads before. Any help is appreciated
Don't get sucked into the "It's a Corvette *engine, block, heads, etc.*" hype!

There WERE optional engines that could be found in a 'Vette that could have better than the average heads- the valves were bigger, w/not much else being different than any other head that could be found on "lesser" engines. But the 'base' or non 'special HP' 'Vette engines were no different than what the passenger cars and many trucks got.

If you are running a basically stock set-up, or the cam lift is =/< about 0.450", you could easily replace your old heads w/a set of '96-up L31 Vortec heads.

These heads require a dedicated intake, otherwise w/a set of springs to match your cam, they will bolt right on in place of what you now have, and add up to 50 HP in the process.

If the heads you now have are 76cc chambers, there will be a rise in compression ratio if using the Vortec heads. This could mean a switch to premimum fuel.

Last edited by cobalt327; 01-17-2011 at 04:14 AM.
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Old 01-17-2011, 11:27 AM
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Yes that does make sense. Im building a 283 for daily driver use. The cam in it is a comp xtreme energy 268H Flat top pistons. Im just having troubles finding a head that will work with that and the .040 over 283 bore.
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Old 01-17-2011, 01:04 PM
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Quote:
Originally Posted by luckynumberslevin
Yes that does make sense. Im building a 283 for daily driver use. The cam in it is a comp xtreme energy 268H Flat top pistons. Im just having troubles finding a head that will work with that and the .040 over 283 bore.
Two heads that immediately come to mind are the 14014416 castings used on high(er) performance 305 engines. They come w/58cc nominal chambers and 1.84" x 1.50" valves- good stuff for a 283 build.

The other head requires a dedicated Vortec intake, and that head is the casting number 12558059 from a L30 Vortec 305 engine. Both these heads have a good combustion chamber sizes, adaquate intake port volumes and valve sizes, and hardened seats for use w/unleaded fuel.

More on the L30 305 head at POST #487.

What you do NOT want is a 350 head that has the 76cc chambers, nor do you really want a 64cc chamber head like the old "fulie" or "double (or camel) hump" heads.

You can also do a search on this forum using the 'Search' function at the top right of the page for "283 engine", etc. for more threads on the subject- there have been many!
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