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: Does a 307 have flat pistons and what is the bore? 4U 2 NV Jan 21st, 03, 09:59 AM There is a truck that has a good engine, and it's selling for a good price, but I can't read the number to well. I know it has a 39700 but I can't make out the last digit or digits. Mortec says is can be a 302,350, or a 307. I know a 302 can be made a 350, but what about the 307? Can you make that a 350? TRT Jan 21st, 03, 10:44 AM The 307 has a 3.875 in. bore which I beleive is the same as a 283. The 302, 327 and 350 all have a 4.00 in. bore ------------------ Tim ======================= 1969 Camaro V8 Coupe Goodwrench 350 TH350 the original 307-2bbl is retired to a corner of my garage sfcamaro69 Jan 21st, 03, 11:52 AM you can't make a 350 out of a 307 and as stated above the 307 is just a stroked 283. BPOS Jan 21st, 03, 01:22 PM Technically, you can make a 350 out of a 307. Bore the block to 4.00" and add a 350 Recip. Assembly, and you have a 350. The drawback is, that's an awfully big overbore for a 307, and the chances of ruining the block are good. Eric68 Jan 22nd, 03, 02:55 AM I've heard that some of the old 307 castings are actually thick enough to bore to 4.00", but like BPOS said, you take a big risk of ruining the block and I would NEVER use a block bored that much for ANY type of high perf use. If its in a truck, its NOT a 302 so based on your casting number info you have either a 350 or 307. Do you know if the engine is original to the truck? If so you might be able to find out if that year/model truck came with a 307 or not. 350 and 305's I think are most common in Chevy trucks. 4U 2 NV Jan 22nd, 03, 04:09 AM The truck had a 4-bolt 350 in it. They took it out and put a new engine in it. They took the crank and cam out of the 350 4-bolt. I don't know if they used it on the new block. The 4-bolt was left outside uncovered and has the pistons stuck because of all the rust. Do you think that rusted block would be good for a rebuild? I think the engine just might be a 350. I'll take another look today to see if I can't make out the last numbers. ryork Jan 22nd, 03, 05:51 AM If the last two number's are 10, you've a good casting numbered block. The 3970010 is a good GM block. I've got 4 of these blocks, three are 4 bolts and one is a 2 bolt. [This message has been edited by ryork (edited 01-22-2003).] | ||