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Old 01-30-2008, 08:41 PM
Wayne
 

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SBC Head Identification Help

OK, Guys – here’s my dilemma. I have three pair of SBC heads. First pair is off a ‘57 283, casting number 3731539 and 3731554 (seriously, one of each number). The second pair is off a different ’62 283, casting number 3814480. The third pair is off a 350, casting number 3998991. Looking in the various head identification lists, 283 heads should be 64cc and the 350 heads should be 75/76cc. I’ve also been looking in the book, “How To Rebuild Your Small Block Chevy”, by David Vizard, he shows photos of the various differences in the heads. My 283 heads match the photos just fine. However, the 350 heads don’t match the photos of the 75/76cc heads. They look more like the photo of the 69cc head. Mine don’t have the raised valve seats but do have the pronounced spark plug hole. I’ve attached photos of the combustion chambers of one of the 350 heads in this post and will attach photos of the 283 heads in the next post (I couldn't get all 5 to post all at once).
Someone please help me figure out which 350 heads these are. If these 350 heads (they do have the up-side-down “T” symbol on the end – the rectangle with the box on top) are truly 69cc heads, I think I can use them on my 283 and have a little more power, plus have the accessory holes that are in the ends of these heads.
One more thing – is it possible to drill and tap the accessory holes in the ends of the 283 heads?
Thanks for any and all advice.
Wayne
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Old 01-30-2008, 10:14 PM
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The '57 heads have offset valve cover bolt holes. The 480s have straight across holes. Both are in the 60cc range. Small 1.72 intakes valves. Both are not anything special and have small intake ports and reportedly run out of breath. I've seen all kinds of efforts to make these heads work with accessories. If you try to drill them you'll probably run into problems...not to mention a lot of water.

The 991s are good heavy castings, probably in the 76cc range. Again nothing special.
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Old 01-30-2008, 11:11 PM
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Your photos show what appear to me as 74cc chambers with small 1.72 1.50 valves, More than likely off a 307 chevy engine. MI2600 pretty much told you the dirt on these three sets of heads. the only difference is, they will all run out of breath at 3500 rpm, but the 283 heads will give it more compression, which wont do any good if there is no flow to back it up. If your looking for performance, none of the three are worth it.
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Old 01-31-2008, 06:39 AM
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Here is a link to identify casting numbers.
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Old 01-31-2008, 08:39 AM
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http://www.fastnuf.com/Headguide.html

http://www.mortec.com/

heres a couple of links for head and engine casting #s
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Old 01-31-2008, 11:47 AM
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If you use the 76cc 350 heads on a 283 the compression ratio will be very very low. Too low.
The easiest, cheapest way to use a 283 with the 69 and later accessories is to swap on a set of mid 80's 305 heads.
416's have 1.84x 1.50 inch valves and nominal 58cc chambers
601's have the same valves the chambers range from 53cc to 60cc (they are not all the same)
Either of these heads will work very well on a 283
Both respond to porting and larger 1.94" intake valves for more power
I prefer the #416's. You can finish the 416 chamber from 52cc to 65cc depending on your compression ratio needs.
If your 283 has a flat top piston, a 53cc chamber will give you a nice street performance cr. If your 283 has a piston with a small dome, go with a 57 to 58cc chamber volume.

Getting the compression ratio just right is critical to the success of a small ci motor like the 283.
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Old 01-31-2008, 04:30 PM
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What size engine block, and what is your intended usage for whatever you plan to use any of these heads on, if you use any of them? More info is always a bonus.


In a while, Chet.
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Old 02-01-2008, 10:35 AM
Wayne
 

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Chet,
I'm plannining to use them on a '62 283 in a 1936 Hudson Terraplane 2-Door Sedan that, according to the 1952 New Mexico Title, weighs just under 3,000 pounds. After using the syringe measurement technique suggested by Fiscus on my other post, I find that the 283 heads were right at 65cc's and the 350 heads were right at 70cc's. That was with the spark plugs installed, heads level front-to-back and side-to-side, and the water at the edge of the combustion chamber/head surface.
With these measurements, I 'should' be able to use the 350 heads with no low-compression problems. However, I could be very wrong on this. If I am, then I'll find other heads with the accessory bolt holes that will be more appropriate.

Thanks muches,

Wayne
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Old 02-01-2008, 12:30 PM
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Are your pistons flat topped? You should calculate the compression ratio. You'll need to know the volume of the dish or dome of the piston (if its not a flat top), also how far down the piston is below the deck (Can check with feeler gages and a ruler), and thickness of your head gasket. I use this: http://www.kb-silvolite.com/calc.php?action=comp
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Old 09-07-2008, 06:38 AM
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seems Im not the only one who likes 283's .

heres The Build of my little mouse motor.
1963 SBC 283, skat crank and rods. bored 0.060 over with KB Flat Top Pistons, 0.030 deck height. a set of 80-86 polished, ported, gasket matched SBC 305 heads # 14022601 53cc chambers, hogged out to 2.02/1.60. Manley stainless valves, comp 1.25 springs, locks, retainers, push rod guides, a Set of Crane 'Gold' 1.5 full rollers, Solid Push rods. Competition Magnum Series cam 480 lift, 280 duration, 110 lobe centers. standard double roller timing chain. Edelbrock Performer RPM Air Gap intake manifold with 600cfm Performer series Carb with all choke components removed (dont never need it this time of year and I dont drive it in the winter), Edelbrock 110 GPH 6PSI Mechanical fuel pump. MSD 6AL Ignition box, ACCEL Billet Distributer with Vacuum advance lockout, ACCEL Super Coil, ACCEL Super Stock 8mm Taylor made plug wires, ACCEL Copper resistor header plugs, Flowtec Headers with 1 1/2 tubes. no A/C. No fan (electric fans).

so my question is how am I doing for a first time Build? and what kind of HP and torque should I expect out of this, and what kind of performance will I get out of all this?

I was told that by the specs Im only running a 9.77:1 compression ratio. was hoping for more but i guess thats close enough so I can still run pump fuel, but still run the high octane on the track.

Im backing this with a Built (not stock rebuild) TH350 with a stage 3 transco shift kit, b&m 2800-3200 stall, factory 7.5 10 bolt rear end with 3.73 gears and a mini spool.

All this into a 1983 Chevy S-10. (hence the name S-Fever)
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