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ChevroletSS 12-15-2012 12:06 PM

What does NASCAR use?
 
Anyone know what NASCAR uses for the chevy engine builds??
I know They use a 357/358 small block and have 12:1 CR.

gearheadslife 12-15-2012 01:56 PM

nothing like what you'll have ..
the sbc2.2 was years ago.. todays r09+ are nothing like what you can get your hands on..
anything you'll find used.. is already outdated..
they do have sites that sell old nascar parts...

hcompton 12-15-2012 02:06 PM

Usally gm makes the heads and blocks are made by many manufactures. Brodix and dart can also get you heads.

They are LS based now will straight port design. You cna buy the heads but they are for 4.1 ls short stroke bores not normal 350 style engines.

If you want a nascar or nascar style engine you can get pontiac performance heads from gm performance or you can go 18 degree heads that are also ery good. 18 degree heads and intake will build one hell of a gen one engine. 800 hp is normal number for 18 degree heads.

Sb2 is also easy to get for a late block but will cost a pile of cash over the gen one upgrades. But with 12 degree valves they will make even more power with less rpm and better flow.

Here is a link to gm sight for race heads.
http://www.gmpartsdirect.com/perform...CATID=671.html

cobalt327 12-15-2012 04:25 PM

Quote:

Originally Posted by ChevroletSS (Post 1623176)
Anyone know what NASCAR uses for the chevy engine builds??
I know They use a 357/358 small block and have 12:1 CR.

Nothing in the catalog relates to the current GM NASCAR race engine, the R07 (google it for more info on the current engine). It came after the SB2.2 that you can get heads (18 degree IIRC) and et cetera for. There are used 2.2 engines and parts on racejunk.com. The R07 has nothing in common w/the current production engines as far as parts from one working on the other.

The other manufacturers also have their own race-only NASCAR engines.

1Gary 12-15-2012 04:51 PM

http://www.hotrodders.com/forum/sb2-...on-172478.html

hcompton 12-15-2012 06:50 PM

Looks like current R09 and R07 are what they have used the last few years. The ls7 used to make the r07 is a 4.1 to 4.4 bore block. And the newer blocks all appear to be 4.5 bore for the r09. This is the same type engine used in the pro touring car corvette. The way they are built is pretty sweet you can buy this stockish form but a ls9 is a 2013 427 block punched out way over tolerence. Kinda of hard to think you want to build one of these. You can buy the blocks with proper bore but they are not cheap either and you still can build the 427+ cubes with that block in a short stroke form that would make insane power. So no real reason to pursue the 358 nascar spec engines. There are some much more interesting combos with those borse and valve sizes to be made. A street drivable 800 hp without a turbo is no problem. The heads are amazing and will never be the limiting factor of making big power. The biggest limiting factor would be the crank block and rods. And they are forged cast is not sold in those sizes.

vinniekq2 12-15-2012 07:09 PM

they use 200,000 one dollar bills times 10 engines. around 900 horse power. so almost every possible part we cant afford. lets me know when someone has a parts list,lol.

1Gary 12-15-2012 07:10 PM

What I have seen in NASCAR is rough forgings for custom one of a kind in house builds.

632Mantis 12-15-2012 07:28 PM

SB2.2 heads are AMAZING. The flow numbers are incredible.
They are made for hi-rpm. And yes, they have been around a long time.

I seen a mid 90's Camaro with a 394cid SB2.2-head motor just devastate a 70 Nova with a 555cid Brodix-headed roller motor. The Nova had NO chance against the Camaro. I'm talking like a 15 car-length difference in the 1/4 mile. Neither car was running power-adders. The Camaro had a single 5" exhaust pipe out the back. It was one sick ride.

vinniekq2 12-15-2012 07:38 PM

The old heads had flow numbers over 400 cfm,I wonder what the heads flow now? 10,000 rpm needs air,lots of air

gearheadslife 12-15-2012 10:08 PM

Quote:

Originally Posted by vinniekq2 (Post 1623252)
they use 200,000 one dollar bills times 10 engines. around 900 horse power. so almost every possible part we cant afford. lets me know when someone has a parts list,lol.


they are about 40k to lease give or take..
as long as you bring it back after the race in one piece
even if you get a parts list.. each team that has an engine program, gets the parts raw.. and put their own magic in them.. heads on a hendrick car will not look like a RCR head in the ports or chamber.. at this level.. every little tiny thing makes a difference..
when and if you see an RCR head on those used racing part sites. they've already move past that tech.. the ro7 that I has the honor of helping see built.. every port is different, the cam lobes are different for every cyl.. all to get as equal a/f to every cyl..
the parts list is the easy part, the labor put into everything is the difference..

cobalt327 12-15-2012 10:16 PM

Nothing on the R07 translates to the LSx engine. Nothing fits. Not the heads, crank, cam, nothing worth mentioning. GM says
Quote:

Although the R07 is a purpose-built racing engine, it has strong ties to production powerplants. "The concepts and processes that are used to improve the performance of our racing engines is shared with the production engine designers to improve the efficiency of our production engines," said Tom Stephens, group vice president of GM Powertrain."
Which is newspeak for we want to tie it in to our production engine for advertising purposes even though it has no crossover.

The bore is not 4.5", the bore centers are at 4.5". Big difference- NASCAR has a bore diameter limit at about 4.185".

lmsport 12-16-2012 04:24 PM

To lease an engine from Hendricks for 1 race, capable of qualifying on time, cost about $50k 6 years ago. For that money you got a tuner and a mechanic for the weekend. I would guess that price has doubled by now.

hcompton 12-18-2012 08:44 AM

Seen these on ebay and figured you guys would like to take a look.

Chevy R07 Aluminum Cylinder Heads Set 99 Complete NASCAR Arca Nationwide NHRA | eBay

They look nice i think they should fit a 6.0 truck engine.

1Gary 12-18-2012 09:24 AM

NASCAR provides sealed controllers to the teams not to be altered in any way for the EFI systems and is unavailable to the general public.


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