GM BLOCK

[305chevy c-10]

is anybody ever heard of  a 305 gm block that can be bored to a 350 ......i was told that u can only do this with GM blocks because they are thicker ...........he said a GM 350 block can be bored to a 406 also with plenty of of metal between cyclinder walls............if this is true how do i found these what to look for as for as markings

[acefoxx]

yeah, I don't think any of that is true. The blocks are all interchangeable but you can not bore them that big. 

[Da67goatman]

you can bore and stroke to increase cubes, but I don't think all of them interchange like that.  I know a 350 destroked will yeild a 327 and vice versa.

[acefoxx]

sorry, by interchange I meant heads, motor mounts, transmissions, accessories. Not displacements. 

[ohio hab]

Yes, motor mounts, transmissions, etc. interchange. 400 s.b. is externally balanced, where 305, 327, 350, are internally balanced. 400 heads have 2 steam holes, where others don't. Heads can interchange thou, with a modification done to fit the 400. You can use 305 heads on 350, 400, but with the small valve size of the heads, you would be hurting performance. The 305 heads can be upgraded at a great cost. All this info is about Genaration 1 s.b.c.'s.

[Irish_Alley]

to get the 406 you need to bore out a 400

[Captkaos]

is anybody ever heard of  a 305 gm block that can be bored to a 350 ......i was told that u can only do this with GM blocks because they are thicker ...........he said a GM 350 block can be bored to a 406 also with plenty of of metal between cyclinder walls............if this is true how do i found these what to look for as for as markings

Whomever informed you of this knows nothing about Chevy motors.

[motion427]

I second that.

[Psycho71]

Agreed, not all SBC's are just bored and stroked differently. There are dedicated castings for the various configurations. That's why 305's go for almost nothing used, and good 350 and 400 blocks go for more.

[305chevy c-10]

got a good deal on 350 ....i think it was tpi or tbi .dont know which .......block has 638 on it with # 14093638 .......heads have 14102193 .gm24 ...guy said it came out of 93 1500 .......has to be rebuilt though .motor was outside ....some rust on piston but they move ......i will get it bored  .030 or .040 depending on how bad the walls are .......does any body know about these casting # .......i was thinking of vortec heads .but i have a intake ,hei distributor already for regular heads ..........does anybody know how these 14102193 flow .......or buying a complete set will be cheaper than rebuilding these
on the rear of my block it has GM5.7LG  SGI .......350 i know that much

[howlinwolf]

wow. looks like a thought stream.

[KY..Rob]

got a good deal on 350 ....i think it was tpi or tbi .dont know which .......block has 638 on it with # 14093638 .......heads have 14102193 .gm24 ...guy said it came out of 93 1500 .......has to be rebuilt though .motor was outside ....some rust on piston but they move ......i will get it bored  .030 or .040 depending on how bad the walls are .......does any body know about these casting # .......i was thinking of vortec heads .but i have a intake ,hei distributor already for regular heads ..........does anybody know how these 14102193 flow .......or buying a complete set will be cheaper than rebuilding these
on the rear of my block it has GM5.7LG  SGI .......350 i know that much

Your Block, Comes up as a 1986-94 350  The heads come up as 1986-88,  350, 1:94-1:50  EFI

[305chevy c-10]

i know that it is a 2 bolt main ...how do i tell if its 1or 2 pc rear mains .....flat or roller cam

[Jim Rockford]

google is your friend.

[beastie_3]

google is your friend.

It is. But so are we.