Within Stock rules???

[vic guilmino]

Todd amen

[Dan Fahey]

Originally Posted by Todd Hoven

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

Bill Jenkins engines were massively modified.
Hardly warmed over!
Custom Tunnel Rams which look like todays COPOs.
The Cylinder Heads were cut and welded together.
Special Alloy Pistons..Rods...cams and stable rocker systems.
Systems to reduce parasitic drag such as dry sumps.
Stuff we all can buy right off the shelf!
The 327 cuin was about the largest SBC engine to make power/weigh with back in those days.
No magic because the principles to make power then the same today.

One exception; the Big Three used a clean sheet of paper to incorporate all the best stuff developed in the past.
Even that stuff is not perfect enough to get another half second of power.
Super chargers and turbos were after thoughts.
Today they are integral as and entire designed package.
Supercharged B/G cars with huge Superchargers are today's Supercharged Super Stockers.

Just with 40-50 years of technology packaged and reclassified!

Originally Posted by Rick Leininger Jr.

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

So modified heads are the only way to make power? The engines are not sold completely blueprinted it is still a manufactured product. it's made like that so owners/engine builders can finish the engine anyway they see fit within the rules. Same thing that has been happening since the early 60's

There is no other way to improve a combo? Tuning, testing ect? Just do the heads and let it rip?

[SSDiv6]

Originally Posted by Todd Hoven

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.

The cylinder heads are also available unported and raw.

[Jeff Stout]

Originally Posted by MR DERBY CITY

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...

I would think clarity of the article would help. I reread the article and title of article and could not find the words "building a factory stock shootout engine." Sounds minor but would clear up this confusion about allowing heads to be ported with a cc max because NHRA can not police it in stock.

[Rick Leininger Jr.]

Originally Posted by Todd Hoven

So modified heads are the only way to make power? The engines are not sold completely blueprinted it is still a manufactured product. it's made like that so owners/engine builders can finish the engine anyway they see fit within the rules. Same thing that has been happening since the early 60's

There is no other way to improve a combo? Tuning, testing ect? Just do the heads and let it rip?

I never mentioned heads, or any other part(s). You said "These cars were build in a max effort capacity to begin with by a company that has every resource." and "The engines are not sold completely blueprinted it is still a manufactured product. it's made like that so owners/engine builders can finish the engine anyway they see fit within the rules."

Which is it?

[Billy Nees]

Originally Posted by Rick Leininger Jr.

Which is it?

That kinda depends on which side of the rules you want to walk on, doesn't it?

[Rick Leininger Jr.]

Originally Posted by Billy Nees

That kinda depends on which side of the rules you want to walk on, doesn't it?

Not necessarily, I think max effort and the performance that comes with it is possible without crossing any lines regarding rules, but that's just my definition.

Originally Posted by Rick Leininger Jr.

I never mentioned heads, or any other part(s). You said "These cars were build in a max effort capacity to begin with by a company that has every resource." and "The engines are not sold completely blueprinted it is still a manufactured product. it's made like that so owners/engine builders can finish the engine anyway they see fit within the rules."

Which is it?

I mean head design, materials used like Ti valves and retainers. Cranks, rods, and other special parts.

I guess is what I'm trying to say is that the CNC program that is used to profile the heads I'm sure has been researched and pretty close to the best you can buy. IMHO.

I think unless you have spent time with one of these engines you don't realize how good the parts are that used in these engines.

[camaroagogo]

These cars are all certainly "stock eliminators"!!