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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 86gmc23 on July 21, 2012, 11:39:18 pm

Title: confused about my block
Post by: 86gmc23 on July 21, 2012, 11:39:18 pm: Just bought a old motor from a guy, he said it was a 350. I ran the numbers GM 14010207 and CFD 207. 14010207 States its an 1980-85 350 from a truck, however the CFD comes up as 1982 305. Do I have a 350 or a 305?
Title: Re: confused about my block
Post by: winky on July 21, 2012, 11:47:30 pm: I believe all the 350 say 5.7 on the back right behind where the heads sit
Title: Re: confused about my block
Post by: Irish_Alley on July 29, 2012, 12:49:42 pm: i hate to say it, cant take someones word on anything nowdays
Title: Re: confused about my block
Post by: 305chevy c-10 on July 29, 2012, 06:33:35 pm: if it dont have it there check top of bellhousing where tran bolt on should be stamped there gm 5.7 .all chevy blocks dont have 5.7 or 350 stamped on them i forgot what year they started so on them type blocks u just gotta run the # .or just pull off the head and see if u have a 4'" bore or better if its been bored .3.74 +/- it is a 305
Title: Re: confused about my block
Post by: 78chevyshortbed on December 12, 2012, 03:16:51 pm: i have the same exact thing and im quite confused.
Title: Re: confused about my block
Post by: chengny on December 13, 2012, 04:04:30 am: GM block casting number 14010207 =

Manufactured 1980-85

350 CID

2 or 4 bolt main

Primarily for truck applications
Title: Re: confused about my block
Post by: pholliday1 on December 13, 2012, 07:16:14 am: For what it's worth I have seen people put 305 heads on a 350 to "try" to increase compression.
Title: Re: confused about my block
Post by: Captkaos on December 13, 2012, 12:41:07 pm: Casting number is a 350.
Title: Re: confused about my block
Post by: Irish_Alley on December 16, 2012, 10:06:42 am: Quote from: pholliday1 on December 13, 2012, 07:16:14 am
For what it's worth I have seen people put 305 heads on a 350 to "try" to increase compression.
arnt the valves different tho?
Title: Re: confused about my block
Post by: Captkaos on December 16, 2012, 01:02:14 pm: 305 heads have smaller combustion chambers (more compression) and smaller valves (less flow at higher rpm) They don't help a larger motor at all.