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Topic Review (Newest First)
12-18-2012 11:23 PM
cobalt327 R07 heads fit R07 block. The R0x heads can be looked at as an extension of the SB2.2.
12-18-2012 08:54 PM
1Gary Pure eye candy
12-18-2012 02:26 PM
Originally Posted by ChevroletSS View Post
Anyone know what NASCAR uses for the chevy engine builds??
I know They use a 357/358 small block and have 12:1 CR.
Depends upon class, the Cup engines are as you heard a lot different take a peek at the link for early ROx <<< ::: MaxChevy ::: GM's R07 NASCAR V8 - 05/15/07 >>>

Flip a page to see the combustion chamber really, really tight.

The SB 2.0 and 2.2 have moved down in class. Keep in mind that the SB engines like the ROx are designed to breathe into 9000 RPM and more providing sustained power at that level, not just bounce the tach to 9000 then retreat to somewhere lower. So these parts are not very streetable if that's what you have in mind.

12-18-2012 02:23 PM
cobalt327 R07 head on LS block? Ain't happening. Different bolt number/pattern, different bore centers, etc.

Probably the easiest way to see this by comparing the head gaskets. R07 top, LSx bottom:

12-18-2012 12:45 PM
Originally Posted by hcompton View Post
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.
Nothing interchanges between these "Race" engines and production ones.
12-18-2012 09:24 AM
1Gary 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.
12-16-2012 04:24 PM
lmsport 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.
12-15-2012 10:16 PM
cobalt327 Nothing on the R07 translates to the LSx engine. Nothing fits. Not the heads, crank, cam, nothing worth mentioning. GM says
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".
12-15-2012 10:08 PM
Originally Posted by vinniekq2 View Post
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..
12-15-2012 07:38 PM
vinniekq2 The old heads had flow numbers over 400 cfm,I wonder what the heads flow now? 10,000 rpm needs air,lots of air
12-15-2012 07:28 PM
632Mantis 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.
12-15-2012 07:10 PM
1Gary What I have seen in NASCAR is rough forgings for custom one of a kind in house builds.
12-15-2012 07:09 PM
vinniekq2 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.
12-15-2012 04:51 PM
12-15-2012 04:25 PM
Originally Posted by ChevroletSS View Post
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 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.
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