sbc help

[ollie947]

heres a issue. is there anyone that can id this block. 3789817 casting number, a862 date code, t0t05d block head stamp number(on the block), 3815822 - gm55 crank. with the numbers should be a sj 327. 62-67. everything is forged. but its not a 4in bore. rings dont fit. its about 3.875. sorry but i dont know alot of chevy guys

 

[alilley]

Re: sbc help

i can tell you this right off hand i do know that a chevy 350 motor is a 4.00 bore and 3.75 stroke and if you bore one .010 over you gain 5 cubic inchs on a v8 if that helps

 

[FreeBeeTony]

Re: sbc help

Looks like it might be a 327.........

http://www.teufert.net/sbchevy/sb-cast.htm

 

[wire2]

Re: sbc help

A SBC 327 has a 4" cylinder bore. That may be a 307. What's the stroke?
(btw, a 350 stroke is 3.48")

http://www.aces.edu/~parmega/sbc.html

 

[zbnutcase]

Re: sbc help

That casting # IS a 4.00 bore 327 block. You said rings don't fit; did you measure the bore? Maybe you got a set of 4.125 400 rings by accident.

 

[ollie947]

Re: sbc help

okay... piston size is 3.85. cant check the block right now. normal for all 327's was 4in. so... 327 block with a bore of a 283? (3.875) dosent make any sense too me. thanks for the help. i got an odd ball





http://www.nastyz28.com/sbchevy/sblock.php

 

[Alpheus]

Re: sbc help

Pistons can to be up to .008 smaller than the bore. You cant have pistons that are exactly 4" fit into a 4" bore. Where do the rings go? Double check the bore size in many positions and holes to get the correct size. I have seen rings that come over sized and you have to file them down to your desired ring gap.

you bore one .010 over you gain 5 cubic inchs on a v8 if that helps

boring a 350 out .030 will make it a 355...

 

[Moggy23]

Re: sbc help

It's a 305 chev Mercruiser 3.75 bore and 3.48 stroke and has .010 OS bore

 

[alilley]

Re: sbc help

i stand corrected the 3.48 strok is of the 350 i was thinking of the 400 with a 3.75 and the boring .010 over ya i was way off on the my bad it had been a long night when i sent that out i do appoligise and stand corrected thanks for keeping me inline

 

[Moggy23]

Re: sbc help

I got it wrong as well, :redface:
283 chevy 3.875 bore, 3.000 stroke
307 chevy 3.876 bore, 3.25 stroke.

Measure the distance, the piston travells down the bore and you'll know the stroke
Sounds like you have 307 which has the 327 crank