View Full Version : sbc info
chubbyx1
02-22-2009, 03:12 PM
400 sbc i bought from a guy, he never ran it, but the motor is bored 0.60 over i'm wondering if it is to much , and if any body have info on a motor like that and bored that much. block 4 bolt.
Have it sonic tested before you go any further!!
zipper06
02-22-2009, 08:21 PM
Have it sonic tested before you go any further!!
X2, i've always thought .040 was pushing the limits.
JMO
Zip.
chubbyx1
02-23-2009, 05:50 AM
in any what is the worst case scenario?
suicidebomb
02-23-2009, 06:54 AM
in any what is the worst case scenario?
Just a WAG on my part, but internal parts, converting to external parts? Hit me with the flame-thrower, I got it coming :!:
chubbyx1
02-23-2009, 07:30 AM
I'm new to all of this, sounds like your saying it is going to blow up.
suicidebomb
02-23-2009, 08:13 AM
I'm new to all of this, sounds like your saying it is going to blow up.
No sir, but you asked for a worst case scenario.
chevynovaman
02-23-2009, 08:20 AM
IS IT STREET DRIVEN OR JUST RACED?
chubbyx1
02-23-2009, 08:58 AM
street and race
performanceengin
02-23-2009, 10:09 AM
thin cyl. walls and heat can only produce cracks...
zipper06
02-23-2009, 01:38 PM
As Hink and advanceengin said. The typical 400 stock block will only have a .150 wal thickness average when bored .030 over. Some builders will sonic test them and shift the bore a little to inprove the wall thinkness after bored. They also ran hot in stock condition IE the steam holes from the factory. Filling the block to the water pump is almost always a No,No for street driving but comonly used in racing applications, but will usually run hot on the street if driven any distance. I think Hink stated in a different thread that testing 6 blocks he could only find 2 that would bore .030 over due to core shift. Sometime the walls can get as thin as .080 tk. due to rust away from the inside, don't forget these blocks are 30 or more yrs. old after boring .030, not good and will run hot and be subject to cracking.
JMO
Zip.
chubbyx1
02-23-2009, 04:55 PM
thank you
chubbyx1
02-23-2009, 04:58 PM
before I end this forum, thank you everyone for their knowledge, one other thing can i save it by putting sleeves in the cylinders
zipper06
02-23-2009, 07:28 PM
before I end this forum, thank you everyone for their knowledge, one other thing can i save it by putting sleeves in the cylinders
Not advised if you run water, because the web is too narrow between the cylinders and they tend to leak. I've seen 2 that has happened to.
Again just my opinion
Zip.
cepx111
02-23-2009, 09:51 PM
Suicidebomb> your too funny....lol
Get a 350 block and be done with it - or drag out the ole credit card and order up a Dart little "M"
Later Cp
cepx111
02-23-2009, 09:53 PM
[quote="chubbyx1"] before I end this forum
No wait, please don't end it! We need this forum to fulfill our very existence!
Cp
chubbyx1
02-09-2010, 01:23 PM
Thanks to all for your replies, results is one of the cylinder keeps getting anti freeze inside and motor was tested for only 60lbs of compression.