Big Block Chevy

[dmaxfireman]

Anybody have a list of torque specs and assembly tolerences for a mark iv bbc.

I am getting ready to machine, order parts, and assemble my 427td project motor for my new beater / brush puller

 

[dmaxfireman]

Big Block Chevrolet

Torque Specs

Main cap bolt, 396-427 2-bolt 95 ft.-lbs.
Main cap bolt, 396-454 4-bolt (inner/outer) 110 ft.-lbs.
3/8 in. connecting rod bolt 50 ft.-lbs.
7/16 in. connecting rod bolt 67-73 ft.-lbs.
Cylinder head bolts, long 75 - 80 ft.-lbs.
Cylinder head bolts, short 65-68 ft.-lbs.
Screw-in rocker arm studs 50 ft.-lbs.
Intake manifold bolts (cast iron head) 25 - 30 ft.-lbs.
Oil pump bolt 65 ft.-lbs.
Cam sprocket bolts 20 ft.-lbs.
Harmonic damper bolt 85 ft.-lbs.
Flywheel/Flexplate bolts 60 ft.-lbs.
Pressure plate bolts 35 ft.-lbs.
Bell housing bolts 25 ft.-lbs.
Exhaust manifold bolts 20 ft.-lbs.
Timing Cover 7 ft-lbs.
Oil Pan Bolts 7 ft-lbs large bolts 12 ft-lbs
Valve Cover Bolts 5 ft-lbs
Camshaft Sprocket Bolts 20 ft-lbs
Water Pump Bolts 20 ft-lbs
Temprature Sending unit 20 ft-lbs
Spark Plug 5/8 15 ft-lbs
13/16 22 ft-lbs

 

[dmaxfireman]

i found tq specs how about assembly tolerances

 

[duratothemax]

the proper torque spec is usea6.0lsxsmallblockinstead ft lbs.

 

[dmaxfireman]

haha thanks ben..... are your bags packed yet??

 

[Leadfoot]

i found tq specs how about assembly tolerances

What pistons you using, type of rings, compression, rpms, oil type/viscosity, etc..

Do you want OEM specs? My housemate builds motors for a living, I could give you his number. I know he does very little by the book (as the book is designed for OEM parts and usage). Alot is based on application and parts used.

 

[juddski88]

Chris, I gave him Steve's number...he's supposed to call him:thumb::hug:

 

[juddski88]

the proper torque spec is usea6.0lsxsmallblockinstead ft lbs.

I agreeeeeee:woott:

 

[Big Block 88]

the proper torque spec is usea6.0lsxsmallblockinstead ft lbs.

I love LSX engine's but there is no way it will ever make the low end tq of the old BBC, the advantage to the LSX would be the rev's and durability/drivability. I am pretty biased to the big blocks though

 

[dmaxfireman]

left steve a message.

so far took a ball hone to the cyls and from what i can tell its gonna need a min .030 over. ring ridge is pretty bad and there is a little bit of pitting from sitting for 10yrs or so. i'm leaning towards a .060 over and maybe even a 4.25 stroker crank

 

[jon5212]

I love LSX engine's but there is no way it will ever make the low end tq of the old BBC, the advantage to the LSX would be the rev's and durability/drivability. I am pretty biased to the big blocks though

Have you seen what budget 6.0's with a big single turbo do?

 

[Big Block 88]

Have you seen what budget 6.0's with a big single turbo do?

Yep they make great horse power, and I will be building one here shortly for my 2000 reg cab here pretty quick. I love a high winding LS motor, I have an affection for all GM V8's there is no motor out there short of the d-max that can make the power for a few pennies like the LS motors.


But it can NOT make the LOW end grunt of a big block, turbo a Mark IV and see what you get out of it... I can't help there is a reason my nick name is Big Block...

 

[ripmf666]

Yep they make great horse power, and I will be building one here shortly for my 2000 reg cab here pretty quick. I love a high winding LS motor, I have an affection for all GM V8's there is no motor out there short of the d-max that can make the power for a few pennies like the LS motors.


But it can NOT make the LOW end grunt of a big block, turbo a Mark IV and see what you get out of it... I can't help there is a reason my nick name is Big Block...

My 400 sbc made a many 468 bbc boys cry in there day hehe

 

[Big Block 88]

My 400 sbc made a many 468 bbc boys cry in there day hehe

Come on now Henry:hug: you know you were sprayin the shiot out of it... Part for PArt there is still no replacment for dispacment

 

[05Lilly]

clearance mains and rods .002 plastic gauge
crank fun out .005 to .008
oil pressure 10 pounds for every 1k you plan to turn
piston to valve .100 on intake and .080 exhaust minimum

 

[ripmf666]

Come on now Henry:hug: you know you were sprayin the shiot out of it... Part for PArt there is still no replacment for dispacment

Motor for motor we were nose to nose and he was running alot more motor then me. On the bottle I was spraying a 250 kit and he was using the same and I walked him he had to step up to Alcohol and stacked 2 of his 250 kits to just get a 9.99 run out of his 70 nova that was tubed light at 3,100.My poor 79Z28 was a small little 275/60/15 M&H dot and was kinda heavy 3660 even had the old 8 track in it lol and still ran 10.67 @ 133