What are the changes from SB2 to SB2.2

ChrisU · Post by **ChrisU** » Tue Jan 03, 2006 2:03 pm

What was the revision???

jacksoni · Post by **jacksoni** » Tue Jan 03, 2006 2:52 pm

I don't know all the differences but: The intake valve angle is 11*x4* instead of 12*x4*. The valve cover rail has a slightly different shape so gaskets and rocker covers do not interchange. The GM description says in the SB2.2 the intake were moved .25 toward the intake flange and 0.08 toward bore center while the exhaust was moved 0.014 toward the cylinder wall. Presumably, since the description is not clear in this regard, this is in comparison to the SB2 and not something else. In addition, the later castings have different material in the port walls so porting ability is affected (according to Darin Morgan) making the later castings much more favorable than the early ones. I think the identifier is the color of the plugs in the top but I don't know the code. Mine has aluminum colored plugs so I am not sure but have heard of bronze and I think green plugs. Hope this helps.
Jack

melsie68 · Post by **melsie68** » Tue Jan 03, 2006 10:05 pm

24502559...96-97

12480011...97-up

These are the two casting numbers to look for. You will find either number under the valve cover area along with a date code just on the other side of the head in the same area. Apparently the SB2 design did not work very well from what I have heard. It must not have for the the casting to only be around for one year. It is virtually impossible to find parts for them as well, so I would stay away from those #559 castings.

Mine have the "smaller" blue deck plugs and they are a '98 casting.

ChrisU · Post by **ChrisU** » Wed Jan 04, 2006 8:40 am

The ones that a customer gave me are part number 12480011. He said they were the original SB2, but by the part numbers I'm gathering they are the SB2.2.

These have the blue plugs in them.

I have not built an engine with an SB2 head. What type of tool do I need for doing the head bolts under the exhaust flanges??

jacksoni · Post by **jacksoni** » Wed Jan 04, 2006 9:00 am

The 011 head is SB2.2. Below is the GM description of differences. They say you need a 7/16" box end torque adapter (Mac tools P/N XB142 with 3/8" drive) for the short studs under the exhaust ports.

12480011 SB2.2 Aluminum Cylinder Head
This aluminum cylinder head, designed for Winston Cup competition style racing, is very similar to the SB2 head P/N 24502559 released in 1996. This head was designed to improve durability, simplify preparation procedures, and reduce the overall cost of building and maintaining a small block racing engine. Intake ports are a "mirror" design; exhaust ports remain the same as original SB2. All eight ports are angled toward the center of the engine. The SB2.2 has an 11º by 4º intake valve angle and 8º exhaust. The intake valves centerlines were moved 0.250" closer to the intake flange and 0.080" toward the cylinder bore centerline.

We recommend a 2.15" intake valve and overall length of 5.65", and the exhaust valves were moved 0.014" outward. The spark plug holes were moved 0.125" toward the center of the bore for combustion efficiency. This head is redesigned to use shaft mounted aftermarket rocker arms, and the rocker cover rail was rolled five degrees toward the intake flange to increase clearance for the intake rocker arms. The valve spring pads were increased for use of 1.625" valve springs. Material has been added to the deck surface for a 48cc combustion chamber, and with a flat top piston it gives 12.1:1 compression. This head has been x-ray inspected to insure quality, then hot isostactic pressed. Replacement intake port plugs to plug bolt holes in intake runners are size AN-8 with four per kit, P/N 12480171.

melsie68 · Post by **melsie68** » Wed Jan 04, 2006 11:37 am

I have a Snap On torque adapter tool #FRDH141 for the studs under the exhaust ports.

flyin ryan · Post by **flyin ryan** » Wed Jan 04, 2006 2:33 pm

melsie68 wrote:I have a Snap On torque adapter tool #FRDH141 for the studs under the exhaust ports.

i'm pretty sure that's the same part number T/A i just got for my little chiefs. you need it for half of the outer short studs.

flyin ryan · Post by **flyin ryan** » Thu Jan 05, 2006 3:23 pm

my info says the exh. valve is moved outboard .041", not .014" ? one is right

aiso they said the 11 in the new part no: means 11 degrees

jacksoni · Post by **jacksoni** » Thu Jan 05, 2006 3:32 pm

flyin ryan wrote:my info says the exh. valve is moved outboard .041", not .014" ? one is right aiso they said the 11 in the new part no: means 11 degrees

You may well be correct but my second post above was a direct cut and paste from the GM high performance parts website. Doesn't make it accurate though.

MadBill · Post by **MadBill** » Thu Jan 05, 2006 4:47 pm

Am I correct that the plug colors referred to are the ones in the access holes for the 'port' row of head fasteners? If so, since they are removed each time the head is detached, it seems a dubious identifier...

flyin ryan · Post by **flyin ryan** » Fri Jan 06, 2006 2:02 pm

MadBill wrote:Am I correct that the plug colors referred to are the ones in the access holes for the 'port' row of head fasteners? If so, since they are removed each time the head is detached, it seems a dubious identifier...

we are talking about the General remember

melsie68 · Post by **melsie68** » Fri Jan 06, 2006 6:06 pm

flyin ryan wrote:
MadBill wrote:Am I correct that the plug colors referred to are the ones in the access holes for the 'port' row of head fasteners? If so, since they are removed each time the head is detached, it seems a dubious identifier...
we are talking about the General remember

If there are in fact differences it isn't only in the color of the port plugs. There are probably much more definitive characteristics which set them apart from each other. I can say the port plugs on the earlier heads were smaller in diameter than on the newer heads.

SWB · Post by **SWB** » Sat Jan 07, 2006 9:05 pm

The first set of SB2 heads I saw did not have inlet ports that looked anything like the 2.2's I see now days. I do realize that everyone has their own basic port design, but these were different enough to suggest a completely different coring.

SWB

jacksoni · Post by **jacksoni** » Tue Mar 21, 2006 9:20 am

melsie68 wrote:I have a Snap On torque adapter tool #FRDH141 for the studs under the exhaust ports.

Does anyone have the formula to convert the torque readings when usuing one of these?

keithnh · Post by **keithnh** » Thu Aug 18, 2022 8:55 pm

Trying to upgrade an sbc (94 Goodwrench block-GMPP Fastburn heads-Lunati 3.100/2.00 DZ crank) to hold and use 7500 rpm. Would like to use sbc Jesel belt setup for timing and find them listed for sb2/sb2.2. Is there a reason why the sb2 or 2.2 wouldnt work with an sbc.? Camshaft axis to crank different? Different pulley attachment etc?

Don Terrill’s Speed-Talk

What are the changes from SB2 to SB2.2

What are the changes from SB2 to SB2.2

Re: What are the changes from SB2 to SB2.2