I'm looking for answers or where to find the answers. I have an engine on a stand for many years. I was told, way back then, it's a 283. It has 461 X camel hump heads. The domed pistons are stamped .060. If it's a 283 is in now a 292? Are these good heads for this bore? I've attached photos of the block numbers, pistons and heads. Thanks for your info. Tom
measure the bore, with a ruler, to the nearest 1/32 inch, and you'll know what you have. 327 started as 4" bore, 283 as 3-7/8" Are there numbers stamped on the block deck at the front? The casting number looks 1970s or later, which means it's neither 283 nor 327. And the best part, is that it's a big block casting number, unrelated to the engine you seem to be talking about.
yeah, and looking at both of his pics that show the rear of the block, it's obvious they are two different blocks. One is nice orange, the other is dirty old iron.
Oh, crap. I do have a 454 and I sent the wrong photo. Yes, dirty old iron!!!! The bore measures 3 15/16---ish. It is less than 4". Thnx
oldsfrench, THANKS, it's a 1957-1966 283. Mystery solved! I will keep that info site for future use. Tom
Are the heads 3782461 X a good fit with this 3849852 engine? If the slightly domed pistons are in good shape are they good to reuse? There is zero ridge on the cylinder walls.
How about a shot of the heads from the front and also the full casting number and date under the rocker cover(s).
Maybe a photo of the crankshaft flange too? That'll tell the tale of 283 or 327. I am Butch/56sedendelivery.
Back a few years (1990's +/-)...the 461x heads were VERY sought after in some of the "econo" classes in the NHRA. Yes, they were the best flowing "stock" head available. Then the NHRA changed the rules to let other and modified heads into the class. Mike
Can you make sense of the numbers in the photos? I cannot get a straight on photo of the crank flange due to the engine stand. The casting numbers look like: 8782461 GM3 A122 8782461 GM A52 11 13 16 2 13
the casting dates on the heads are Jan 5 and Jan 12 1962 (A 5 2 and A 12 2) what's the date code on the block? should be something similar to those letter/numbers on the back, not far from the casting number no stamped number on the front of the block deck surface? the crank looks 283 to me
Kind of depends on how deep your pockets are? Every engine should be bigger....but sometimes we do fine with what we have
Yes, like squirrel said, the crank IS a 265/283 crank, with the completely round, crankshaft flange/NO cutout. If it's really .060 over, then it's a 292; 4", or .125 over, makes it a 301/302 (depending on your math). In the later 60's, a few companies made 350 CID engines using re-welded and machined 283 cranks, and 327 cranks (small journal) to make a 350, so it really needs to be looked at carefully. The 301 VS 302 CID was dependent on your "math", whether you used 3.14 as pi, or 3.1415926535 as pi, or continued out to a million times. Basically, anything "less" than .5000 came up as 301, anything greater than that (.5001) was 302). Basic high school math rules in effect here; I hated MATH by the way, and still do!!! Most likely 2.02 valve intake heads due to the "X"- factor" (Ha Ha), but it's really hard to see in your "angled" photos of` the valves. We need to see the intake and exhaust valves "straight on", to see the gap between the valves Who knows what's been done over the years; new seats with 1.94 valves??? Everything is a SWAG here. My guess would be a 292 CID engine with 2.02 intake valve heads (lots of guys did this); good for a race engine, "whatever" for a street engine. And by that I mean, would you SEE any difference with 1.94 intakes vs 2.02 valves? Nope! What's the camshaft? That'll make more difference than anything. I would "guess" the pistons with a .125 dome would be around 10.50:1; same "style" piston in a 327 was 10.35:1, and with a 1/4 inch more stroke on intake/compression cycles. I am Butch/56sedandelivery..
No one has mentioned the oil pan, that is the old, early ‘60’s Corvette six quart hi-perf pan with a trap door, p/n 3820000. It was used in conjunction with a flat baffle that mounted on the main bolts. If the pan won’t fit your chassis don’t let it go cheap, especially if it is not damaged much in the sump. Corvette guys will want that pan.