<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: novadude</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GM_427_Racer</div><div class="ubbcode-body">Nice videos, I enjoyed watching them both. I see that you have a Ken Keir single wheelie bar too, it is definitely a slick piece.
The intake is a stock Chevy piece, it is an NHRA approved replacement casting number 19131359, so dimensionally, it is pretty close to the original.
GM </div></div>
Just curious... what cylinder heads does NHRA allow for this combo? Those AL heads don't look factory. </div></div>
Nova Dude,
You would be correct, the heads are not Chevrolet factory parts, however, if you look at the last picture of the driver's side engine, their is an "NHRA" logo milled into the head by Edelbrock who is the manufacturer of these heads.
NHRA does a pretty good job of supplying the racer the approved specifications to run just about any combination that has been built for a bunch of years. If you go to
www.nhraracer.com and look on the left side, you will find a section that says "Engine Blueprint Specifications", click on that, and then scroll to the manufacturer that you want and click on the year and you will see all the pertinent specifications of the particular engine you are interested. The accepted cylinder head replacements are also listed for the particular combination based on the last three digits of the casting number under the notes section, not to mention all the other information. There is also a section on that same web page, "NHRA Accepted Products" and that section has a ton of information as to what after market products NHRA accepts in place of the original parts that are becoming extinct. All of these reference pages along with an NHRA rule book gives the racer what he/she has to know in order to race a legal car. They also provide a service (phone numbers) where you can call either one of the division Tech Directors or the national Tech line located in Indianapolis to answer any questions the racers may have.
There is also another section called "Stock Car Classification" a little further down the page and that section will basically tell you what class the particular car and engine combination that you choose will be. However, you need a rule book to see what the weight breaks are for each class since they are based on NHRA factored horsepower and their shipping weights to determine which class. It is kind of complicated, but the rule book does spell it out as to how to make the necessary calculations to come to the correct weight and class.
I hope this answers your question, if you have any others, feel free to ask and I will do my best to help.
Gary Merrick