400 sbc price - The 1947 - Present Chevrolet & GMC Truck Message Board Network

codydubb · 01-10-2011, 02:46 PM

just curious on opinions i have a chance to pick up a 400 but curious what everyone thinks its worth, its been bored .030 over at one time but it needs a total rebuild right now and its a 2 bolt main.

jchav62 · 01-10-2011, 04:12 PM

From what I hear, 30 over is maxxed out for a 400. If it's ready for a rebuild again, there may not be enough meat left on the bone.

spudz · 01-10-2011, 04:27 PM

I would also be scared of a bored 400. I would want to have it sonic checked to see if it can be bored again.

codydubb · 01-10-2011, 04:59 PM

ok. and another question ive read any 400 pushing over 400 needs splayed main caps?

BigBlocksRule · 01-10-2011, 05:58 PM

2-bolt 400's are stronger than 4-bolt blocks. The outer bolts cut through the weakest part of the main web. If it was run at .030, see if it'll clean up at .040 with a good hone job. If it has a ridge around the top of the bores, it probably won't clean up that way and is not a good candidate. Thin cylinder walls plus thin fire ring on head gaskets really restricts how much overbore you can get away with.
I've seen several 2-bolt main 400's at 500 - 550hp, but I sure wouldn't want to push it fartherr than that.

mooseknuckles · 01-10-2011, 07:11 PM

my buddy had a 406, 2bolt mains, water jackets half filled with this block cement stuff for added strength, made over 500 hp and 480 tq. that thing was crazy.

3r!c84 · 01-10-2011, 07:43 PM

Quote:

Originally Posted by codydubb

ok. and another question ive read any 400 pushing over 400 needs splayed main caps?

wrong. 2 bolt mains are stronger then the 4bolt 400s. but in that power range. you dont need splayed caps. go check out my thread i just built a 400 for my truck. getting me into the 13s in the 1/4. upwords in the 400hp range.

slugish · 01-11-2011, 12:38 AM

Quote:

Originally Posted by mooseknuckles

my buddy had a 406, 2bolt mains, water jackets half filled with this block cement stuff for added strength, made over 500 hp and 480 tq. that thing was crazy.

Yea, mine is bored .40 over with concrete & HAVE RUN THE DOG**** OUT OF IT FOR 7 YEARS.

3r!c84 · 01-11-2011, 12:50 AM

Whats this talk about concrete? How do it stay cool?
Posted via Mobile Device

mongoose · 01-11-2011, 01:21 AM

but running it for a minute at a time... there's still cooling depending on how much you actually fill it.. it's more or less a drag only type of a mod.

slugish · 01-11-2011, 11:03 PM

old gear head built my engine . Had some world class small blocks back in his day . The correct amount of concrete is essential (don't know what that is ) but I never overheat > run a 160 thermostat > most it gets is 180-190 when it's hot outside .

3r!c84 · 01-11-2011, 11:10 PM

how do coolant flow then?

Hazieview · 01-12-2011, 03:45 AM

I dont really know how much one would be worth but I do own one. I own a small block 400 bored .030 over. It is a torque monster!

If you want the block tell the person you are buying it from that you want to have it checked out.

If he is honest he should have no problem. Take it to the machine shop. Let them look it over. If it is good give him the cash. If not I doubt he will want it back unless he sells scrap metal...

Just my 2 cents... It has worked for me in the past! Good luck!

BigBlocksRule · 01-12-2011, 08:08 AM

Most that use hardblock just fill 'em to the water pump holes. They can actually run on the street when filled, the bottom part of the bore doesn't get nearly as hot as the top, so they make sure to leave the top of the block's cooling jackets open for coolant flow.
That said, I wouldn't mess with trying to run a filled 400 on the street, with no coolant flow between the tops of the cylinders, I'd bet it'll overheat and maybe crack.

spudz · 01-12-2011, 09:36 AM

I would say its worth no more then 100 bux.... atleast to me it isnt..

01-10-2011, 02:46 PM	#1
codydubb Registered User Join Date: Mar 2010 Location: Preston Id Posts: 86	400 sbc price just curious on opinions i have a chance to pick up a 400 but curious what everyone thinks its worth, its been bored .030 over at one time but it needs a total rebuild right now and its a 2 bolt main. __________________ 1985 Chevy C10 350 .60 over iron eagle h-beam rods, sealed power high comp pistons, forged crank, vortec heads, edelbrock performer rpm vortec intake, roller rockers, .488 .510 cam 750 Demon Double Pumper, Longtube headers, Dual Flowmaster exhaust,Dual electric fans, Proform electric water pump. TCI 3500 Stall Converter th350 trans B&M shift kit 10 bolt 3.73 Detroit Locker

01-10-2011, 04:12 PM	#2
jchav62 1962 C-10 Join Date: Apr 2005 Location: Las Vegas, New Mexico Posts: 4,978	Re: 400 sbc price From what I hear, 30 over is maxxed out for a 400. If it's ready for a rebuild again, there may not be enough meat left on the bone. __________________ Joseph Chavez "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4

01-10-2011, 04:27 PM	#3
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: 400 sbc price I would also be scared of a bored 400. I would want to have it sonic checked to see if it can be bored again. __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..

01-10-2011, 04:59 PM	#4
codydubb Registered User Join Date: Mar 2010 Location: Preston Id Posts: 86	Re: 400 sbc price ok. and another question ive read any 400 pushing over 400 needs splayed main caps? __________________ 1985 Chevy C10 350 .60 over iron eagle h-beam rods, sealed power high comp pistons, forged crank, vortec heads, edelbrock performer rpm vortec intake, roller rockers, .488 .510 cam 750 Demon Double Pumper, Longtube headers, Dual Flowmaster exhaust,Dual electric fans, Proform electric water pump. TCI 3500 Stall Converter th350 trans B&M shift kit 10 bolt 3.73 Detroit Locker

01-10-2011, 05:58 PM	#5
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 400 sbc price 2-bolt 400's are stronger than 4-bolt blocks. The outer bolts cut through the weakest part of the main web. If it was run at .030, see if it'll clean up at .040 with a good hone job. If it has a ridge around the top of the bores, it probably won't clean up that way and is not a good candidate. Thin cylinder walls plus thin fire ring on head gaskets really restricts how much overbore you can get away with. I've seen several 2-bolt main 400's at 500 - 550hp, but I sure wouldn't want to push it fartherr than that.

01-10-2011, 07:11 PM	#6
mooseknuckles Registered User Join Date: Sep 2009 Location: ottawa,canada Posts: 4,550	Re: 400 sbc price my buddy had a 406, 2bolt mains, water jackets half filled with this block cement stuff for added strength, made over 500 hp and 480 tq. that thing was crazy. __________________ my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682

01-11-2011, 12:50 AM	#9
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: 400 sbc price Whats this talk about concrete? How do it stay cool? Posted via Mobile Device __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

01-11-2011, 01:21 AM	#10
mongoose Registered User Join Date: Feb 2009 Location: slurrey, bc. Posts: 1,134	Re: 400 sbc price but running it for a minute at a time... there's still cooling depending on how much you actually fill it.. it's more or less a drag only type of a mod. __________________ -'73 c/10 - Low with Go - will be complete... probably never. -'90 2wd Blazer - well... soon enough anyways. -'84 SWB - the daily gas guzzler.

01-11-2011, 11:03 PM	#11
slugish Slugish Join Date: Jan 2005 Location: Earlysville, Va. Posts: 1,024	Re: 400 sbc price old gear head built my engine . Had some world class small blocks back in his day . The correct amount of concrete is essential (don't know what that is ) but I never overheat > run a 160 thermostat > most it gets is 180-190 when it's hot outside .

01-11-2011, 11:10 PM	#12
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: 400 sbc price how do coolant flow then? __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

01-12-2011, 03:45 AM	#13
Hazieview Building Dreams out of Dimes! Join Date: May 2005 Location: Bonham, Tx Posts: 892	Re: 400 sbc price I dont really know how much one would be worth but I do own one. I own a small block 400 bored .030 over. It is a torque monster! If you want the block tell the person you are buying it from that you want to have it checked out. If he is honest he should have no problem. Take it to the machine shop. Let them look it over. If it is good give him the cash. If not I doubt he will want it back unless he sells scrap metal... Just my 2 cents... It has worked for me in the past! Good luck!

01-12-2011, 08:08 AM	#14
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 400 sbc price Most that use hardblock just fill 'em to the water pump holes. They can actually run on the street when filled, the bottom part of the bore doesn't get nearly as hot as the top, so they make sure to leave the top of the block's cooling jackets open for coolant flow. That said, I wouldn't mess with trying to run a filled 400 on the street, with no coolant flow between the tops of the cylinders, I'd bet it'll overheat and maybe crack.

01-12-2011, 09:36 AM	#15
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: 400 sbc price I would say its worth no more then 100 bux.... atleast to me it isnt.. __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..



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