Within Stock rules???
 

Interesting article

http://www.enginelabs.com/engine-tec...liminator-ls7/

Re: Within Stock rules???
 

Larry, are you sure that would pass tech for stock. Great read, but WOW - STOCK.

Re: Within Stock rules???
 

fishy

Re: Within Stock rules???
 

From the article:

“Racers have figured out how to hide port work, so the NHRA has given up on trying to enforce that rule.

But its still a rule?

Re: Within Stock rules???
 

Wow! This looks like the unfiltered version that hit the web.

I'm going to the store to stock up on popcorn, this should generate some entertaining discussion.

Re: Within Stock rules???
 

Wow! Really?

Re: Within Stock rules???
 

This engine in no way would pass a tear down anywhere. For multiple reasons. Read the article. I'm really surprised they didn't install an .850 lift cam while they were at it. Might as well go full Pro Stock. I'm sure NHRA will allow all the blatant violations as they have with all the chassis changes only for the new cars. This is getting more ridiculous every day. Jim


.

Re: Within Stock rules???
 

Am I missing something, porting in runners and girdle on main caps good to go now?

Re: Within Stock rules???
 

When I read the article my first thought was when did they change the stock rules, did I miss it ?

Re: Within Stock rules???
 

New Cars=New Rules??? Those get a 9" diff too but my Chevelle Doesn't!
I am beginning to think that those cars have a different rule book than the rest of us...

I will bet the the "SAM-tech" car gets torn down at the next race as well as anyone affiliated with that program. Just my opinion.

Re: Within Stock rules???
 

Talk about opening up a can of worms...

Re: Within Stock rules???
 

"Titanium prohibited" . Does anyone read the rule book anymore? I hope these guys are proud of their work.

Jim Mantle 6632

Re: Within Stock rules???
 

Guys, just in case you missed the memo..Sam Tech is the sponsor of the Factory Stock Showdown. All the modifications are within the rules. Remember, NHRA is the organization that allows FORDs to use CHEVROLET rods in their stock Elminator engines...

Re: Within Stock rules???
 

MJ, the Australian School Bus 390's came with the Chevy rods!

Re: Within Stock rules???
 

The OEM's dictate the rules on these cars.

Re: Within Stock rules???
 

Thats what happens when someone who does not know beans about class racing gets a job that includes accepting products for Stock.

Re: Within Stock rules???
 

Heckuva Super Stock motor......http://i246.photobucket.com/albums/g..._roll_eyes.gif

Re: Within Stock rules???
 

I was joking some people pm me need to lighten up!

Re: Within Stock rules???
 

The cylinder heads are CNC ported as shipped by GM and they are part number 17802818.
They feature:
• 12 Degree Valve Angle
• 2.205" titanium intake valves
• 1.615" sodium-filled exhaust valves
• Max-Life Beehive-type valve springs
• Valve retainers and locks
• Intake and exhaust stem seals
• Intake lash cap
• 275cc Intake Port
• 90cc Exhaust

There is also another version of the 427 COPO engine used for Factory Stock that runs the LSX-DR cylinder head engine with larger valves and a 313 cc intake port and 110cc exhaust port. This cylinder heads run a CFE designed intake manifold with a Holey Dominator sized throttle body.

http://www.chevyhardcore.com/news/ne...take-approved/

There is another similar article on an LS3, 396 CID LS engine built by Patterson.

http://www.enginelabs.com/engine-tec...-stock-racing/

Re: Within Stock rules???
 

More interesting reading on the ERL block that SAM uses.




http://www.enginelabs.com/engine-tec...-ls-lt-blocks/

Re: Within Stock rules???
 

The Sam's guys are smart and know the rules. I would be willing to bet that they would pass teardown anywhere.

Re: Within Stock rules???
 

Stock Cars Section 10A, page 3

CYLINDER HEADS

Porting, polishing, welding, epoxying and acid-porting prohibited.
Combustion-chamber modifications prohibited

External modifications prohibited.

and from the article "http://www.enginelabs.com/engine-tec...liminator-ls7/"

“The maximum intake port volume we’re allowed is 275cc, so we milled down the intake flange surface to shorten up the length of the port just slightly. This gives us some extra room to touch up the short-turn radius, bowl, and valve job area and increase the cross-section a bit without exceeding the cc limit,” Judson reveals.


hmmm?

Re: Within Stock rules???
 

The heads come from the factory cnc ported. When you can start with a bare, unported version and run your own cnc program, you can make it virtually undetectable. If you read my statement, I said those guys are smart, and I would bet money it would pass teardown. And if it can pass teardown, then it must be legal, right?

Re: Within Stock rules???
 

After publishing their sneaky bits, they should get to experience an immediate and thorough looky loo!

Re: Within Stock rules???
 

These engines are 1970 Pro Stock Engines!

Re: Within Stock rules???
 

[QUOTE=Peter Ash;499395]After publishing their sneaky bits, they should get to experience an immediate and thorough looky loo![/QUOTE

Still willing to bet they will be just fine if they do.

Re: Within Stock rules???
 

They are way more advanced than that, lol

Re: Within Stock rules???
 

There is nothing illegal about what ERL does to an otherwise stock GM block that bears the correct casting number. Here are the facts. The GM block as it comes from the factory is JUNK and is not usable beyond .005 over bore so there is no good reason for a serious racer trying to win in the Factory Shootout to leave the "maximum allowable" over bore rule on the table just because GM built a crappy block. If GM had built a "decent block" for these engines in the first place the work ERL does would not be necessary.

The only other legal option is to run a replacement LSX block that is easily over bored to the maximum allowable specification. However, there are not to many COPO's that can deal with the extra 100 or so pounds on the nose and still be able to race at the minimum weight for the Shootout.

Why do I know this stuff you might ask? The reason is because I did it and the LSX iron block over a sleeved block that is prepped correct!y is maybe 5 hp MAX which is not worth putting 100# on the nose of the car. However, the gain from an LSX block compared to a "stock" COPO block is worth at least 25 HP, but this is largely due to the gain from the extra cubic inches that can't be achieved with a stock GM aluminum block.

Bottom line is that it costs money to go fast, and going fast just isn't for everybody. Doesn't mean those of us that wish to compete at the very highest level shouldn't be able to do it with a clear conscience as long as there is nothing illegal in doing so.

Re: Within Stock rules???
 

Very well said.

Re: Within Stock rules???
 

Great reply Mike Keener^^^^^^^^^

Re: Within Stock rules???
 

I know, I know all about the Aussie school bus with the 390. I have worked on numerous at my shop. The friggin steering wheel is on the wrong side, the Holley carb is waaaay too big for a school bus and when my shop foreman pulled the bus in he about tore off that damn oil pan because it hangs waaaay too low...How about that Mr. Rusty ???

Re: Within Stock rules???
 

MJ,
Ya gotta love fast school buses in OZ, right ?

Re: Within Stock rules???
 

I can't see why this thread has gotten so far off topic?

Who gives a damn about the diameter of school bus rods- and what in the world does it have to do with the legality of a COPO engine, which by the rules submitted by GM to NHRA is completely and totally legal?

Re: Within Stock rules???
 

Why would you say that.?

Re: Within Stock rules???
 

that's funny

Re: Within Stock rules???
 

Yeah, I wouldn't have told that one. Might have done it. Would not have told it. LOL

Re: Within Stock rules???
 

what makes you think that the heads are not the best they can be right from GM? Why would you have to start with a new head anyway? These cars were build in a max effort capacity to begin with by a company that has every resource.

Re: Within Stock rules???
 

Those engines are complete junk compared to what these cars have now. the 1970 pro stock engines were warmed over passenger car engines. Very good for the time but nothing compared to what these cars are coming with

Re: Within Stock rules???
 

Then why do all the newer combos (COPO, Cobra Jet, Drag Pak) go quicker when "gone through"?

Re: Within Stock rules???
 

Blueprinting