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Old 01-11-2002, 01:37 PM   #1
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Difference in 487 and 487X SBC Heads

I got the info below from Mortec but it doesn't tell me a whole lot. Does anyone have any more info?

3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber
3973487X...71-72...350..........75cc chamber

Thanks
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87 Camaro with 700R4 (2.025 Stall) and 3.23 posi., 383cid 4-bolt #010, Int. Balanced Eagle crank assembly, 4340 crank and H-Bean 6.0 rods with SRP flat tops.
DART IE 200/72cc heads with Harland Sharp 1.5 full roller rockers and Guide Plates.
9.9:1 Stat, 8.1:1 Dyn C/R.
Comp Cams XE274H (230/236 .487/.490 110LSA 1,800-6,000 RPM).
Edelbrock RPM manifold with Holley 750 (Vac/Electric).
MSD Pro-Billet (Vac) with 6AL box and Blaster2 coil. Bosch HR 9 BP Plugs.
Hooker SC LT headers, 3" pipe to Dynomax muffler and 2 1/2" dual outlets.
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Old 01-11-2002, 03:48 PM   #2
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Don't hold me to this, but I thought the X heads intake port was about 10cc larger.
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Old 01-12-2002, 07:36 PM   #3
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I dont think theres any difference at all. I think the X just denotes that the head originally came on a corvette. Whereas the plain number was probably camaro.
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Old 01-12-2002, 09:25 PM   #4
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I've rebuilt engines with 487 and 487x heads. Both numbers I've seen came off 4 barrel-350s out of '71-'72 full size cars. Nothing special about the engines. However, I do remember reading, a long time ago, that the 487x was just slightly better flowing.
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Old 01-12-2002, 10:23 PM   #5
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Are they worth keeping?

I have a pair of the 487X's in my back yard ready for the 'Junk Yard'. Are they worth keeping?

Let me go on a bit. I've already built a 383 with A/M heads (Dart IE 200/72). A friend of mine is now building a 383, and I believe there is a little 'Monkey See- Monkey Do', but I spent some time at his garage the other day and dammed if he isn't going with a nice looking re-built set of 487X heads with Stainless Valves, etc.

Does that make sence? (See also my first statement)?
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Old 01-12-2002, 10:50 PM   #6
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It's possible that Jihn is correct, I recall the 461 and 461x castings of the mid 60's, and the "x" casting has larger intake ports.

Sorry, I've not heard of the 487's, but a trip to mortec.com or chevymania.com may yeild some info.
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Old 01-13-2002, 01:23 PM   #7
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X = 10cc more intake volume

Thx for the lead on www.ChevyMania.com, here is what they say:

3973487 68-79 1.94/1.50 & 2.02/1.6 165-330 76 CC Chambers
3973487X casting has 10cc more intake volume.

Starting from a well weathered bare casting are they worth resurrecting, from the dead?

My intentions would be to use them on a budget 383 build. I already have a spare #010 4-Bolt ready to go, bored, decked and notched.
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Old 01-13-2002, 01:23 PM
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