The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

crazy longhorn · 08-04-2003, 08:33 PM

I have a couple of the 10 / 20 blocks in a 2 bolt main(as posted by Hutch, higher tin & nickel). The blocks i usually find with the 10/20 under the chain cover are a 3970010 casting. On some of the later 70s/ early 80s blocks, there was a 010 cast on the lower sides of the block(denotes 4" bore). On the 350 to 327, you can use a 307 crank, & 327 pistons in the 350 block(the rods are all the same 5.7" c to c except the 400 sb @ 5.565). You will find different rod & main journal sizing ( sj or lj), but the late 327(68), & the 307's had the same journal sizes as the 350(as did the 68 & 69 302). crazyL

08-04-2003, 08:33 PM	#9
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I have a couple of the 10 / 20 blocks in a 2 bolt main(as posted by Hutch, higher tin & nickel). The blocks i usually find with the 10/20 under the chain cover are a 3970010 casting. On some of the later 70s/ early 80s blocks, there was a 010 cast on the lower sides of the block(denotes 4" bore). On the 350 to 327, you can use a 307 crank, & 327 pistons in the 350 block(the rods are all the same 5.7" c to c except the 400 sb @ 5.565). You will find different rod & main journal sizing ( sj or lj), but the late 327(68), & the 307's had the same journal sizes as the 350(as did the 68 & 69 302). crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... Last edited by crazy longhorn; 08-04-2003 at 08:35 PM.