Certified Stock "Qualifying Numbers"

This has been a great thread!

I'm impressed how far under the NHRA limits most of these engines are!

I would like to know from the certified guys if upping the bore size .030 or .060 over made a big difference in the way the motor performed? (horsepower or efficency wise?)

I ask because I'm running the stock original pistons in mine (4.25 bore) now and the original block has been milled down to .004 (1970 383 NHRA spec) and I have contemplated about redoing the block again and was wondering if it is worth the extra expense of boring it out? It sure seems to bring up the CR up more when running the numbers thru a calculator.

By the way when I rebuilt the the motor the first time many years ago (42000 original miles at the time) The block and the pistons were unouched and at that time the pistons were anywhere between ,038 to .049 down in the hole and when I calculated the the CR it was 8.44:1 which was well below the advertised 9.5:1 for the 70 383.

 

:TU:

thats tells me that some of these guys know what they are doing and that i don't need to embarass myself anymore than necessary ...

 

In the late 60's I replaced a General Motors built 283 in my 57 Chevy with a NHRA spec .060 over 283 blueprinted block / cc'd heads / Forgedtrue lightweight pistons / Dykes rings / Lunati blueprint cam.



I picked up 3/4 of a second :shock: over the original engine.

 

Here are the numbers for Darrel Detweiler's 1970 Olds 4-4-2 W-30:

 

casey , is it possible to post their time and MPH with the specs ?

 

GREAT idea John !

I will do that. :TU:

 

thanks

 

OK, let jazz this up just a little more. :Brow:

Below is the list of ALL that have Certified - to date. As you can see, there is the person, vehicle, best ET/MPH, AND measured weight at Mid-Michigan Motorplex. I don't think I have all the info, but I should be able to get it. Also, if I am mistaken on any of my data, please advise ! :Smarty:

Oh yea -- And since ET's and weight are public knowledge already, I'm not asking permission to post it.


Casey Marks 1970 Oldsmobile F85 W-31 350/325 Auto 12.82 @ 107.95 3720#

Darrel Detweiler 1970 Oldsmobile 4-4-2 W-30 455/370 Auto - 12.69 @ 110.05 3915#

Jeff Peterson 1963 Plymouth Sport Fury 426/425 Auto - 12.05 @ 116.76 3774#

Jim Spetzman 1969 Dodge Superbee 440+6/390 Auto 12.38 @ 111.39 3739#

Bob Karakashian 1969 Dodge Superbee 440+6/390 Auto 12.33 @ 112.05 3737#

Brian Stefina 1964 Mercury Marauder 427/425 4Spd 13.28 @ 107.50 4367#

Rob Clary 1969 Chevrolet Yenko Camaro 427/425 Auto 12.36 @ 113.60 3777#

Dave Hemker 1970 Buick GS Stage 1 455/360 4Spd 12.63 @ 108.87 3689#

Jim Johnston 1969 Chevrolet Nova SS 396/375 4Spd

Tom Kelly 1969 Plymouth Roadrunner 426/425 Auto 12.89 @ 109.36 3933#

Peter Simpson 1969 Chevrolet Camaro ZL-1 427/430 Auto 12.09 @ 116.09 3527#

Tem Greene 1970 Dodge Challenger R/T 440+6/390 4Spd

Tim Clary 1970 Chevrolet Chevelle SS 454/450 4Spd 12.48 @ 113.15 3877#

Benoit Holloway 1970 Chevrolet Corvette 350/370 4Spd 12.57 @ 112.50 3320#

Mark Weymouth 1970 Challenger T/A 340+6/290 Auto 13.50 @ 103.65 3717#

Jim Johnston 1969 Chevrolet Corvette L-88 427/430 4Spd

Ted Harbit 1963 Studebaker Super Lark 289/289 4Spd 13.30 @ 102.02 3559#

 

Glad you asked,

Speaking for my car, you cannot get certified with non original carbs, you can get certified with original carbs not listed on the NHRA specs.

NHRA lists the C3AE-BK and BJ carbs, mine runs the C3AE-C carbs. I supplied two different carburetor publications to verify these were also factory installed in '63 and early '64.

Just another case of the NHRA listing being a guidline.

 

I know that my intake shows different. Not sure what the deal is though ? o No: I've got an intake on the car, and an intake sitting here looking me in the face, and they are both 407571. One cast the first month of 1970, and the other cast in 1974. Either way, there is no mistaking that they are correct 1970 W-350 intakes.

And as a side note: The last time that the NHRA records were updated for 1970 Oldsmobiles was April 1989. o No:

 

Can Clary's 69 Camaro really weigh more than Hemker's 70 GS ?

 

Factory Lightweight Buick!

Or, Factory Heavyweight Camaro?

That would be the lightest Buick GS convert out there o No:

 

Unfortunately, I guess it can. I've had our car on the certified scales here in town, and with fuel & me in the seat it weighed 3850lbs...it's weighed over 3800lbs. a couple times in Stanton, with 3837 being it's heaviest in '02. The THM400 and power steering don't help with the bulk issue. But, I just don't see dad letting me *lighten* a 31,000 mile original Yenko Camaro just for a couple weekends of fun...o No:

I think it would be interesting to compare current race weights with *period* advertised or published weights...

---------------------------------------
Hillbilly Racing Team
"Home of the obese '69 Camaro..."

 

I just talked to your Dad and he said you can lighten up the car but you can only use a torch and sawsall. I say "go for it" :TU: Jim

 

... to date? Interesting. To date we have not had a Ford certify (although Mercury is duly represented). I see there has been no sign of an AMC product either. And despite a couple of 12 second candidates (who shall remain nameless) in recent years, no Pontiac representation in C/S! Are they merely getting stocker 'n stocker under cover of darkness? Do we have word on anyone coming forward to clear the air for these Marques? Do they need Buick appearance money to help ferret them out? o No:

 

I'd offer to Certify, but I doubt anyone would be interested in my top secret build that gets my well into the 13.80's........ o No:

 

Actually..., I'd like to know -- that's a step in the right direct for me! No one's exactly calmouring to learn the secrets of my blistering mid-14 second performances. Given the rate of improvement by everyone else, it's only a matter of time before I get offered the solo by-run at the beginning. :laugh:

 

I think you might have just found my secret....the fear of the opening bye run......... :beer

 

Fear of the opening by run

:laugh: :laugh:

Your still what.....1.5 to two seconds ahead of the opening by-run. Still lots of room.

I will say this on your behalf.......none of the certified cars (mine included) drive the car 6 hours to race. :TU:

A person can make their car as fast as it can be, or as fast as they want it to be. That's one of the neat things with two out of three shootouts.