Re: NHRA 2020 Rule Amendment SS Intakes???
Welp, looks like 2020 will be the final year for us!
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Re: NHRA 2020 Rule Amendment SS Intakes???
Correct me if I'm wrong but if you angle mill the head at an extreme angle thereby reducing the port volume and NHRA only measures the head port volume aren't these "spacers" allowing larger cylinder head port volumes? It's not really about adapting different intakes but using the "spacer" to raise cylinder head port volume as the head isn't measured with the spacer installed. I guess the port entry can be raised also. Seems like a reasonable rule change to me. Although I feel for those affected, anytime you push the rules you put yourself in a position to have the rules get tightened, not in you favor whether it's been accepted before or not.
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The volumes are measured without the adapters. |
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(123 posts later ;-) ) |
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I wonder if exhaust adaptors will be illegal too? I mean, the angle should be checked on the exhaust side, if the intake rule gets reinstated!
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From rule book SS heads - Must be correct casting number for year and horsepower claimed, per NHRA Technical Bulletins or NHRA-accepted. Cylinder-head casting must also be on NHRA runner volume list as published on NHRARacer.com. Porting, polishing, welding, epoxying, and acid-porting permitted. |
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It is not about volume, it is about CSA, volume and shape of the port. You can have a 230cc port volume that is outperformed by a 200cc port volume. |
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I don't race Super Stock anymore. I have enough trouble racing Stock, lately. I don't care what you guys do, and not going to suggest anything here.
I can tell you this. I realize they didn't measure port volume in the old days. So you guys can call this stuff cheating, being innovative, gettin' competitve, whatever you like but , if Farmer, Greg X , or Marty Barrett were still with us, the first time they laid eyes on this stuff, they would have called it .. "buh bye" |
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Perhaps you shouldn't take his statement as an absolute. |
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Want to discuss chamber mods and angle milling? |
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The "First" word is the key. They would never have passed this stuff as you call it, then after multiple passing's,and multiple years,change their mind and say " to all those guys we told it was Ok..... please junk your stuff" |
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As stated in a prior post, legally, Super Stock cylinder heads can be welded and/or epoxied. The angle milling does not have nothing to do with the volume of the ports. The majority of the Super Stock Chevy small block cylinder heads ports have been reshaped with epoxy and most are configured to an oval port from the OEM rectangular port shape. Therefore, any Super Stock cylinder head can be returned to the appropriate port volume by welding or the use of epoxy. |
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I guess you just can't expect too much for your 350 bucks. Just trying to put all this in perspective |
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No wonder Stock and Super Stockers are running ET's that were State of the Art back then.. |
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Good thing pinned studs are still legal......All the racers with them can breathe a sigh of relief...…..LOL
P.S. I did pin a lot of studs but it was at least 30 years ago and a lot more.... |
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I am curious why it's always been worded as "must hold volume" and no mention of maximum.
"Cylinder head must be able to hold combustion chamber, intake and exhaust runner volumes per NHRA Specifications" The way I interpret that is a five gallon bucket will hold a gallon but a one gallon bucket won't hold five. So ports can be larger than their spec but not smaller. Obviously they want the combustion chamber to hold all of the 72cc or whatever spec is but they want that 205cc port to hold NO MORE THAN 205cc. Why wouldn't they just say that? A lot of the rulebook seems to have been written in 1952 and they added extra words instead of rewriting the whole thing. The previously mentioned pinned studs for example. |
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Then......the Magazines and the Internet "Experts" convinced all these streetcar folks that they needed Vortec heads as a "budget" performance option. You put one more ounce of spring pressure or cam lift on those things. and the studs seem to fly out. Once they see that the guides have to be cut and new seals installed, there's no room in the "budget" for screw-in studs. Now pinning becomes an option again. P.S. I can't describe how much I dislike pinning studs nowadays. |
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Who is going to be the first to take a bbc oval port head and mill 1" off the intake flange of head below the valve cover bolts? Should gain 50-60cc to open up the port.
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Do you even know what you are talking about? Gain 50 to 60 cc's when the rules allow you to port, epoxy and epoxy the cylinder heads? |
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Bert knows exactly what he is talking about! If they cc without the spacer plate there is a ton to gain. And if there wasn't gains to be had in port volume, then why do they make'm. Air speed can still be retained with more volume.
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As for it being legal per the rulebook, the no external modifications wording makes it illegal. Also, isn't there a sentence somewhere in rulebook that if it doesn't say you can do it, then you can't? Not sure about that but recall something like it. I looked at a bbc head last night and roughly calculated the 50-60cc number using 1.75"x2"x1" but the port is oval not rectangular. So it would not be that big but bet it is 30-40cc. The advantage would definitely be bigger for bbc verses sbc. |
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The rule states the intake bolt holes must remain in original location. How can you cut 1" off the head and still leave the intake bolts in their original location? Or how about the valve cover bolt holes?
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The spacer is just an extension of the intake runner. Just adding more volume to the intake tract does not make more power. As Jeff Niceswanger stated, you can do the same with the proper sheet metal or billet intake or even by welding a cast intake. |
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