Certified Stock "Qualifying Numbers"

Mark, many thanks for one of the best posts I've seen in an online forum. Please let us know where those articles appear...

Mike Williams

 

thanks jim . the only reason i could see for adding the reliefs was to allow clearance for a wild duration stock lift spec cam .

its possible this engine was used for another purpose before being put back to stock and the thinking at the time was why fix a bottom end that ain't broke . o No:

i'm building this 383 and using the heads i have and then i'll run the car some and see if i can even figure out if i can drive it on the F70's , if it seems to run better than i expect maybe i'll scare up another set of heads and take some power out of it ?

not thats i'll probably make any of the PS events , i don't really have the time to get off during the week to make the long trip from boston , yes thats a lame excuse but free time for myself is what i have very little of , i took my bee apart to fix the grenaded engine in july 2000 , last touched it in nov.2000

heck i even had an engine that except for a cam and intake swap was would have been PS legal

of course the pic is to large to attach of it :spank:

 

camshaft validation

Ok...............who was at this years certification? Did they measure cam lobe duration and lift to validate camshafts?

JIM

 

I was there for the last 3 years watching for the Mopar Camp to make sure the G.M. Boys didnt sneek anything under the wires, :grin: and all that was tested was lift, not duration, but it was going to be tested but Scott T. couldnt be there to assist. Also, I finally remember why my exhaust lobe had a few thousands more lift, it was all that cam assembly lube!!!! :Brow: Jim

 

:error: :error:

 

Our '65 GTO is original unrestored condition and original owner. Believe me, the car is in way better shape!! :laugh:

K

 

John RR:

There's 3 races this summer out your way that would be easier to get to and participate in, than Michigan races. The Hemmings Musclepalooza is on Memorial day weekend in Lebanon, NY (not far at all from Boston), and Gonzo is going to have his races in July and November at Englishton, NJ. That's also pretty close. Bring it out and join the fun. :TU:

 

thanks dave , i am already signed up for the hemmings race , thats 3 hours dragging a trailer , the etown stuff is doable as long as its not snowing ou:

i would love to get out to a mi. race though

 

Doubt it'll be snowing in July :laugh: , but you're right about November. I plan to come out for that one and have lots of bad experiences with snow/ice at that time of the year coming across NY and/or Pa. from here. No fun.

See you at Lebanon.

Dan and Bob's original race is the ultimate. Would be great to make it one time.

 

Cert'd Cars

I was there with Jim and he is correct. This year duration was skipped due to Scott have to leave for a funeral I believe it was.

Mike, thank you for the kind words. The magazine will be Musclecar Enthusiast. The first article Dan and I are writting currently is on a comparison of the RA III and RA IV certifiable motors. The next is on the 440 6 bbl, and followed by a comparison of 455 HO and 455 SD motors. The last is comparing iron headed '70 LS6 motor against a aluminum headed '71 LS6 Vette motor. That will come with a chassis dyno shoot likely to go with the engine dyno info. Again all motors are built to be cert'd.

Here is a general chart on compression. It shows that compression while helping does not do as much as one may think on these cert'd cars that have pressed NHRA rules. And in particular if you start at a high number such as L78/L71/LS6/429 Fords etc. This is expressed in %.

new cr original cr
9:1 10:1 11:1 12:1 13:1
10:1 2.9
11:1 5.5 2.5
12:1 7.7 4.7 2.1
13.1 9.7 6.6 4.0 1.9
14.1 11.5 8.3 5.7 3.5 1.6

As you can see it takes large moves to make good progress. On a '70 RA IV for instance you have a 10.5 to 1 motor that can go up to about 12 to 1 by NHRA specs. It is about a 2.4% increase in power assuming we have 400 hp to work with it only takes you up to 409.6 hp. I would like 10 extra ponies but that move is not why cert'd cars run so fast.

Mark

 

Curious about the non matching carb and intake numbers. o No:

So, can I run Ka heads on a 70 W30? NHRA legal replacements.

(I say this because the FAST boys say I have to carve up some nice expensive F heads to run with them. uzzled: )

 

Yes, you would need to run "F" heads.

 

F is what they came with from the factory. Ka were years later. (like after J's) First used on jet boat and agricultural engines, then later subbed in for F's, D's, and H's in service by Mother General and GMPD. Good heads, just never came out of the factory on a car. :error:

Now if we were racing Pure Stock stationary irrigation engines, that would probably work. :laugh:

Casey: Love the Dangerfeld one liners. One of his best ever was "I was so poor growing up, if I weren't a boy, I'd have had nothing to play with."

 

Yeah, I know the story with the Ka's. And I wouldn't mind running my F's in P/S since they wouldn't be getting carved up. (soon to have two sets of "F's" actually. one ported. One not. :laugh: )

I was just asking that since apparently you can get certified with non original intakes and carbs.

Or did I miss something? At least two cars showed parts numbers that didn't match.

 

John: I was re-reading some of the posts, and I guess I missed this! DOH!! I *assume* you're talking about race weight of the car, or were you asking about specific component weights?

---------------------------------------
Hillbilly Racing Team
"Home of the obese Camaro..."

 

Got access to a dremel tool?

Here is a cheap alternative to your expensive "F" heads, go out and find a
pair of "E" heads, and make them "F"'s.

 

thank you , this is one i thought thhey were ignoring

well both now that you mention it , but since the engines are NOT being completely disassembled i'll guess that pistons and rods are not weighed , but are 4 speed cars :3gears: checked for things like an ALUM. flywheel ?? :Brow:

but my question was , are the cars put on the scale at the track to see how close they are to manufacture published weights , without the driver

 

The cars at the Pure Stock Races in Michigan ARE put on the scales.

 

shhhhhh!!!!! :spank: :bglasses:

 

And several of them are heavy sob's! Race weight of my car, and my lard rump totaled 4201#. :jd: And several are heavier than that. Who says that torque doesn't get you moving! o No: