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Author Topic:   sb2
thebomb
Dirt Maniac

Total posts: 149
posted April 09, 2005 12:52 PM  
what does sb2 actually mean? i have allways wonderd this when im shoping for engine parts and see this....

rocket36
Dirt Freak

Total posts: 209
posted April 09, 2005 01:43 PM  
i'll be brave and take a guess here.

Small Block 2nd generation.

thebomb
Dirt Maniac

Total posts: 149
posted April 09, 2005 02:02 PM  
so that would be the new one peice mains?

eaton89
Dirt Freak

Total posts: 268
posted April 09, 2005 04:25 PM  
I dont think so. The one peice seal blocks are just that. I believe sbc2 is what nascar uses. I think the deck height and wedge or the angle that the pistons lay apart is different. Also the heads are different. Not sure but thats what I was told.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 09, 2005 10:39 PM  
small block 2 is what it is.... its a different head/block package all together

thebomb
Dirt Maniac

Total posts: 149
posted April 10, 2005 01:47 AM  
so are the forged pistons that you see on ebay for goos prices pretty much useless to guys like us?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 10, 2005 07:14 AM  
if the pistons are for sb2 stuff then yes.....

thebomb
Dirt Maniac

Total posts: 149
posted April 10, 2005 12:39 PM  
thanx guys

rickbraley
Dirt Full Roller

Total posts: 58
posted April 12, 2005 06:25 AM  
If I wanted to get an "SB2" what make/year vehicle would it come from? Also, why aren't more weekend warriors running these engines? Anyone have more info or know where one could get more info on these engines?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 12, 2005 01:41 PM  
Because it just isnt real cost effective to build these. The parts are not as as common and as easy to find.

Some of the super late models are running them. Looking at 28-32,000$ though.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted April 12, 2005 08:00 PM  
rickbraley,

SB2, SB2.2 heads, and SB2 block's are not production car part's. These are factory GM Performance part's, produced originally and primarily for Nextel Cup.

First came the original SB2 head. This was designed to replace 18 degree head's in Cup racing, and compete with the Yates Ford head. Unfortunately it was a piece of junk, and really no better than 18 degree head's. Then came the SB2.2 head. This is a different beast all together. Flow number's on the average head that we use now on Dirt Late Models, are in the 400-415cfm range.

Now to the SB2 block. When the original SB2 head came out, they were designed to be used on the std. Bowtie block's that were in production at the time. Then came the 2.2 head, and modifications were needed. So GM made the SB2 block, which is the std. block used in Cup today. The main difference between the conventional Bowtie block and the SB2 block is the lifter bore spacing. The SB2 block has the lifter bore's spread apart further.

To use SB2.2 head's on a conventional type block, aluminum or steel, you should use a .180" off intake lifter, and a straight up exhaust lifter (we are talking roller lifter's here). This is what we use in the Dirt Late Model engines. About 5 year's ago we tried double offset lifter's, but had a problem with snapping guide bar's due to excessive side load.

If a person were to switch to SB2.2 heads from an 18 degree head engine, you would need to change a few item's. The SB2 and the SB2.2 have the intake and exhaust valves swapped on cylinder's 1,7,2,8, not to mention the valve angle's are completely different from 18 degree style heads. So this requires different piston's, different cam, rocker's, intake manifold, valve cover's, different header's, and of course small item's such as push rod's, head stud's, valve cover gasket's, lifter valley cover etc. It is also necessary to drill a second set of spark plug cooling holes in the deck surface of the block.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
http://www.hendrensracingengines.com

Kromulous
Dirt Forum Champ
Total posts: 796
posted April 12, 2005 08:47 PM  
There starting to show up in some Mods as well, supposed to super smooth engines, built right for the application of course.

rocket36
Dirt Freak

Total posts: 209
posted April 14, 2005 03:10 AM  
thanks steve.
didn't know what a sb2.2 was. now i do.


jpotter94
Dirt Forum Racer

Total posts: 94
posted April 18, 2005 11:16 PM  
like steve said the sb2.2 engines are a totally different breed and are really wicked motors.they are usually 362-388 ci motors that produce around 700hp or more,they are suppose to be super smooth motors.alot of the big boys run this stuff,but like the rest said,they are high dollar units..

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