Say can anyone help me out...rebuilding a sbc that had casting numbers as follows...block=14010207, heads=462624, crank=3932442, pistons=1436 and an unknown camshaft with only a CWC, or CMC and a #1579 and a “D9” between the lobes. There is a casting number of some kind on the face of the sprocket mating surface of 838630. I’ve spent the better part of the evening trying to research these numbers to little avail. I’m told the “CMC/CWC” are a main cam core distributor supplying all the major aftermarket brands. Anyone know what cam that is?
No, but does it matter? I generally put in a new cam and lifters, and select the right one for the vehicle, based on lots of info that you have not provided. If you are re using the cam, and want to know what it is, you might provide pictures of the stamped numbers...so we can see if it looks like an OEM cam, or a replacement. Also, if you want us to help you figure out what the engine is, you might want to provide more clues, such as the stamped numbers on the deck, front, passenger side. Although it's possible they've been milled off, if the block was decked during the rebuilding process. Although the casting numbers indicate it's probably an early 80s truck 350 engine.
Roger that.... well as for the camshaft, I’m reading that stock cams had casting/part numbers in the middle lands, with no markings on the nose. Mine is marked right after the distributor gear and on the nose as well as few other numbers on the lands in different spots. The block’s most significant markings are “207” stamped on both sides and I believe, a date code on a pad just above the bell housing, of “F 9 2” eluding to 6/9/82.
Does the block have the stamped numbers on the front of the pass side deck? The casting date, yeah, June 1982. The cam looks like it could be stock....but it's been a while since I've taken apart a stock 350 from that era I think CWC also shows up on aftermarket cores, but the stamped numbers are usually shorter, and include letters.
Right Squirrel so as stated there are shorter alphanumeric codes on the cam shown in those photos you asked for. The “D9” seems a commonality with other cams denoting “D5”, “D6”, etc. Now I’d read where that block casting number was used in 2 & 4 bolt main configuration while mine is the former. As such and within a range of 82 to 85, mine could still be a “267 cid” sharing both the stroke and block. The timeframe is correct...”BUT”— the pistons are a “Silv-O-Lite” part number, 1436. That denotes a “350” bore size. I CAN say that it appears to have been rebuilt at least one time when the rod beams were smoothed and the rod or main bearings are replaced with .010 or .020 over. Doubtfully, a “267” would be the starting point for much more than a 350, not knowing of any variation in cylinder spacing....I’m guessing there’s not.
267 block has a much smaller bore than the 350. And your block casting number is for a 350. Do the pistons have an overbore size stamped on top? such as 030 and...are there numbers stamped on the deck surface? or not?
Your heads are tapped for screw in studs, if you do not have the studs these Pioneers are what you need. They are 3/8-24 and have 7/16-14 threads on the cylinder head end.
Ahhhhh that’s just good joojoo right there my friend...and yes I tapped them for threaded studs. I’m thinking though that I could add some valvetrain stability by upgrading to pushrod guide-plates with flanged, threaded studs. That’s golden if I don’t decide to go as far though....that’s much appreciated friend. And I’m aware I’d need to clearance the tops of the stud pedestals to compensate for the added height that the flanged ones feature.
CMC= Camshaft Machine Co. and as a OE cam supplier, they also provide most aftermarket cam companies with their "shelf-stock" cam grinds, leaving the cam companies to only do custom grinds. Camshaft Machine Company Your camshaft is a factory stock replacement #274. The Silvolite #1436 is a cast piston with a flat top w/ 4 valve reliefs for a Chevy 350 engine.
Order a GM # 3863151 camshaft and matching lifters.... A set of Z/28 valve springs wouldn't hurt either.....
Awesome recommendations my friend and I appreciate that info. I actually bought a Melling, hydraulic roller cam and tie-bar lifters....I think it was a “MEL-22135”
You’re right about that....and lemme add that I’m becoming much more detailed with this rebuild, still erring on the side of caution with the grind. This’ll be my first experience with engine building and I’m still so green that I’ve made mistakes as colossal as thinking it was a 307 at first. Couldn’t figure out why there was so much confusion with oil Pan gasket orders. Intended upgrades supporting a cam change were 4bbl manifold and headers.
Hahahah .......exactly, m’man—Love it. A “slammed van with a cam”. No flimflam, just who I am. Got an aluminum dual-plain 4bbl with a Quadrajet and some block huggers (basically manifolds but prettier) shooting through two red hots when it’s all done—maybe an “H” or “X” pipe for scavenging.....and ease on down the road. Loved a fellas work some years back on a white, Dodge A100 cab-forward. He dropped it with bags and laid it on the ground. I may only get around to an axle flip job but I’d need it to be low if I ever expect to get it in and out’a my sunken. garage
https://www.jalopyjournal.com/forum/threads/the-h-a-m-b-rules-guidelines.44274/ Not as exciting as a "slammed van with a cam, man" but a good, educational read just the same...........
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