Hey guys,
I am trying to find out what these iron heads are worth and if they are a good iron head to port and get some decent power out of. They came off my GM crate motor and were brand new when I got the motor. They have about 40,000 mi on them. The casting number is 83417369, and they have 72cc combustion chambers, 1.94"/1.60" valves. I looked around on mortec.com and some other places, as well as searching the message boards. I can't seem to find any info on them (i guess cause they're pretty new).
John

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• 84 Firebird w/ T/A gfx
• 350 4bbl (LM1)
• Automatic
• Non-leaking T-Tops (new rubber all around)
• Working headlights (new parts)

Mods: 14" K&N open element, 160* stat, ram-air hood, Accel cap & rotor, MSD Super Conductor Wires, 24mm solid rear & 36mm hollow front sway bar w/ PST polygraphite bushings & endlinks, Spohn SFCs, WS6 springs, SLP 1 3/4" Jet-hot coated headers, Hooker 3" cat-back, Catco high-flow cat, Comp Cams High Energy 268 cam, AFR 190 heads, Weiand Action+ intake, Comp Pro Magnum 1.6:1 Steel Roller Rockers, Moroso Oil Pan with trap doors, windage tray and crankshaft scraper, poly graphite motor mounts, K&N oil filter and Mobil 1 synthetic.

http://www.homepagez.com/350thirdgen/

 

Anyone ever figure this out? I've found heads with that number as well. I'd like to get some use out of em.

 

the first 8 is probably a 3.. 33417369...90-up...350..........Gen.I Goodwrench crate motor, Hecho en Mexico", 76cc... as far as i know they are basically the same thing as some 70's smogger heads..