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-   -   Stock Eliminator Cylinder Heads (https://classracer.com/classforum/showthread.php?t=75979)

SSDiv6 04-15-2020 02:41 PM
Re: Stock Eliminator Cylinder Heads
 
Quote:
Originally Posted by Ed Wright (Post 612336)
After I built my flow bench (could not just buy a SuperFlow) back then) I was shocked at the variation of air flow between different castings, same casting numbers.
Yep. It is called "Core Shift". Caused by a deviation during the casting process due setting on the mold, mold alignment issues, mold temperatures and pressure differentials. One of the many reasons why the fast guys spend lots of money testing and going through many castings.

Jim Hanig 04-15-2020 02:56 PM
Re: Stock Eliminator Cylinder Heads
 
Quote:
Originally Posted by Andy Friar (Post 612254)
What STK combo(s) are the heads and manifold $5500? I am assuming at that cost they are built up and installed, correct?
Not likely.

Larry Hill 04-15-2020 03:19 PM
Re: Stock Eliminator Cylinder Heads
 
After winning Atlanta in the truck, a dime rocket then, I took most of my winnings and purchased a 600 bench, Flo Com,and B'ski fixtures. It still provides hours of fun.

a pontiac 04-15-2020 06:00 PM
Re: Stock Eliminator Cylinder Heads
 
A veteran racer told me long time ago, you can build your own stuff, but when you want to go fast you take it to reputable shop. By the time you go all over the place getting parts and machine work you will spend as much or more. A good builder with fast customers knows what you need or where to find it. Plus their advice and experience will avoid mistakes so you can be fast.

Alan Nyhus 04-15-2020 06:51 PM
Re: Stock Eliminator Cylinder Heads
 
Quote:
Originally Posted by Andy Friar (Post 612340)
WOWSER!!! STK Racers are truly a rare breed then. I can go low 11's for maybe that much on a whole SBC Chevy bracket engine in my Dad's 69 Chevelle, or I can spend that much on just the heads and intake to go maybe a little faster, but NHRA STK legal. I know it's not about the ET ROI in STK, but doing it within a tight window of specs that is the fun. I would like to run the Chevelle in I/S someday, bucket list...

The level of competition being what it is today, and guys that want to win Class at Indy, for example; Does having to pay other people to do a lot of the rollcage, suspension build and tuning, trans build and tuning, engine build, tweaking, massaging etc, does it still feel the same when you go fast? I am NOT trying to start a fight either or offend. I just can't relate as I don't have that kind of checkbook and I am a weirdo in my own right. I would personally rather be near the bottom of a qual list, after a few or more DNQ's, but made the field doing as much as physically possible on my own, then win class buying speed parts/services or a known fast car. (if I somehow magically won the lottery or something, and I do try regularly!!)
Andy, here's the thing....just because you can spend a lot of money, that doesn't mean you have to. Or that you should. Each racer should race the way they want to race, period.

And if that means you're not the killer azz kicker in your class, so be it. You can be a player by watching the qualifying sheets and being careful. And if you get a heads-up at some point...hey, the fast guy still has to run the race and turn on the win light first. Lots of things can, and do, happen.

Don't let not wanting to spend a fortune deter you from getting into Stock or Super Stock. It's a lot of fun, believe me! :) -Al

Alan Nyhus 04-15-2020 06:55 PM
Re: Stock Eliminator Cylinder Heads
 
Quote:
Originally Posted by Frank Castros (Post 612299)
Think about the core issues of this discussion. Stock? What?
Hi Frank.

Thanks for editing your original post to clarify. Makes more sense to me, now. ;) -Al

Ralph A Powell 04-16-2020 08:47 AM
Re: Stock Eliminator Cylinder Heads
 
Main issue is the pins and bushings on the cope and drag wearing overe the course of production. The foundries don’t pay close attention to this! Been in many foundries and they all have same problem from time to time. Lack of good QC.

Quote:
Originally Posted by SSDiv6 (Post 612352)
Yep. It is called "Core Shift". Caused by a deviation during the casting process due setting on the mold, mold alignment issues, mold temperatures and pressure differentials. One of the many reasons why the fast guys spend lots of money testing and going through many castings.

jimmyparker 04-16-2020 12:45 PM
Re: Stock Eliminator Cylinder Heads
 
I'm pretty sure if you spend $6000 on a set of small block iron heads that "core shift" becomes a non-issue.

Ralph A Powell 04-16-2020 02:17 PM
Re: Stock Eliminator Cylinder Heads
 
Oh but you can have problems. It’s call the lawn sprinkler problems

GTX JOHN 04-16-2020 03:45 PM
Re: Stock Eliminator Cylinder Heads
 
Quote:
Originally Posted by jimmyparker (Post 612417)
I'm pretty sure if you spend $6000 on a set of small block iron heads that "core shift" becomes a non-issue.
If I thought that was true.....There would not be racks with a hundred plus sets of head castings in my shop. If core shift does not concern you = I have quite a few that you could get a really good deal on from me!


Just my .02
Your mileage may vary.


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