302 vs 327 vs 350 in same casting #

[bubbletop61]

I am hunting for a 3970010 Block for a 350 and have learned in the process that
the same block was used for the 302, 327, and 350 engines. Whe I look at the engine with the heads on how can I tell which it is. I know I can look at date codes to eliminate some possibilities, but is there anothewr more obviuos way?

The 327 ran from 62 until 68 or 69???I beleive?
The 302 was a around 69 or 70...Help here please?
Is there a date after which there were no more 327s or 302s built in this block casting number?
The same casting can be either 2 bolt or 4 bolt. I know there were some 4 bolt 305s, but were there ever any 4 bolt 327s or 302s?

Can a 3970010 block be bored out to 4.005 (350CID) if it was originally built as one of the others? I have found two blocks to check out, but want to be sure I don't get the wrong thing when I go look tomorrow.
Thanks
BBTP61

[409z28]

3970010
350 69 vette late 4boly main
302 69 camaro z28 late 69 4 bolt
350 69-79 truck 2&4 bolt main
350 69-79 pass,chevlle,camaro,nova 2&4 bolt main
monte carlo also
350 70 vette 300,350,370,hp,4 bolt
350 71 vette 27o,330 hp 4 bolt
350 72 vette 200.255,hp 4 bolt

[Super(sport)Man]

the same block was used for the 302, 327, and 350 engines. Whe I look at the engine with the heads on how can I tell which it is. I know I can look at date codes to eliminate some possibilities, but is there anothewr more obviuos way?

The 327 ran from 62 until 68 or 69???I beleive?
The 302 was a around 69 or 70...Help here please?
Is there a date after which there were no more 327s or 302s built in this block casting number?
The same casting can be either 2 bolt or 4 bolt. I know there were some 4 bolt 305s, but were there ever any 4 bolt 327s or 302s?

Can a 3970010 block be bored out to 4.005 (350CID) if it was originally built as one of the others? I have found two blocks to check out, but want to be sure I don't get the wrong thing when I go look tomorrow.
Thanks
BBTP61

The standard 302/327/350 bore is 4.00. A typical "cleanup" overbore will start at 10 thousandths and typical max is 60 thousandths (4.060"). I think you may have meant "4.050" in your question.

I've never seen a large-journal 327 (post 1968) but I've heard of them... With the casting you're specifying, you have about a 99.5+% chance of getting a 350, since the 302's were only in the Camaro. If you DO somehow end up with a 302, buy it, and grin all the way home, because you've made a real find that's quite valuable to the Camaro guys.

Edit* chopped from another forum:

Displacement Chart

262 = 3.671" Bore x 3.10" Stroke
265 = 3.750" Bore x 3.00" Stroke
267 = 3.500" Bore x 3.48" Stroke
283 = 3.875" Bore x 3.00" Stroke
302 = 4.000" Bore x 3.00" Stroke
305 = 3.740" Bore x 3.48" Stroke
307 = 3.875" Bore x 3.25" Stroke
327 = 4.000" Bore x 3.25" Stroke
350 = 4.000" Bore x 3.48" Stroke
383 = 4.030" Bore x 3.75" Stroke
383 = 4.000" Bore x 3.80" Stroke (GM Crate 383)
400 = 4.125" Bore x 3.75" Stroke

Cubic Inches = Liters

262=4.3
265=4.3
267=4.4
283=4.6
302=5.0
305=5.0
307=5.0
327=5.3
335=5.5
350=5.7 .030 bored=355/.040 bored=357/.060 bored=360
377=6.2
383=6.3
396=6.5
400=6.5 .030 bored=406/.040 bored=409/.060 bored=412
402=6.6
427=7.0
454=7.4
502=8.2

[bubbletop61]

Thanks SS Man, I'll be lookin for that 302, heehee! So they're all about 4.00 bore its just the stroke that changes.
BBTP61

[bubbletop61]

You can't trust anybody theses days! I picked up my engine last night, paid for it, and as soon as I got home (11:00), put it on the engine stand ready to get at this morning. I asked 4 times if he was sure it was a 4 bolt, in English and in French, and lo and behold this morning when I pulled the pan it is a two bolt. Shame on me :doh :doh :( . At least it was nice and clean inside. We're building it to use for the summer only, and then I do a 4 bolt. I trust too easily I'm afraid #+*?%##
BBTP 61