Mopar 440 racers - time to legalize that shortblock!

[herbjr]

Chirs is obvious Rocket doesnt know much about these motors. The mainfolds are available out of the box, the cranks are available to drop in no need to grind as you say. The advantage is 100 grams on the piston. I know this for a fact. If you believe that 100 grams will make you run .5 quicker I have 100 acres of ocean front property near Tulsa, OK Ill be glad to sell you.

Herb McCandless Jr

They should outlaw those 1200. a set pistons rings that I know they are running

[RocketBlock]

deleted double post

[RocketBlock]

Originally Posted by herbjr

Chirs is obvious Rocket doesnt know much about these motors. The mainfolds are available out of the box, the cranks are available to drop in no need to grind as you say. The advantage is 100 grams on the piston. I know this for a fact. If you believe that 100 grams will make you run .5 quicker I have 100 acres of ocean front property near Tulsa, OK Ill be glad to sell you.

Herb McCandless Jr

They should outlaw those 1200. a set pistons rings that I know they are running

Go back to class racing school. The 383 6-pack edelbrock intake does not have the correct 440 6-pack factory casting numbers. That requires at least a part number change to make it appear legal. That is direct violation ofthe rules. At least one top ten qualifier and points earner (no names) ran this engine and the intake was cut extensively and realigned to longer straighter runners for a significant horsepower increase.

The 440 factory crank never had 400 sized mains. Should you or I look upo the specs? I'll get it later.
NHRA does not allow turning the mains beyond normal bearing size replacements. Crossbreeding of parts are illegal.
440 main bearing journal size: 2.750"
400 main bearing journal size: 2.625"
Difference: .125"
Advantage: less frictional loss due to bearing speed.

The compression height is vastly changed which makes a 440 replacement piston impossible to use. So that part is illegal. It's also more than 100 grams a piston.
440 rod length: 6.768"
400 rod length: 6.358"
Difference: .410"
440 stroke: 3.750"

As you can see when using a 400 short deck block the piston pin is moved upwards. This creats a shortskirt piston which in no way could weigh 749 grams as suggested by NHRA for stock eliminator. Thats if your using the NHRA mandated length 440 rod.

Clearly, anybody that runs a 400 B block in stock has to alter the crank, pistons and intake beyond what is legal. That's a lot of work. Would you do all that for a tenth? Two tenths?

[SSDiv6]

Originally Posted by Ed OBrien

So are the ford guys that run a truck crank still ok ? Have a nice day

In Stock class, as long as you run the same OEM material and stroke as the engine you claim, using a crank in the same family is acceptable. As an example, using a cast crank within the different years of a Chevy small block, as long the stroke is identical, it is okay. However, using a forged crank in an engine that had a cast crank is not acceptable.

[RocketBlock]

Originally Posted by SSDiv6

In Stock class, as long as you run the same OEM material and stroke as the engine you claim, using a crank in the same family is acceptable. As an example, using a cast crank within the different years of a Chevy small block, as long the stroke is identical, it is okay. However, using a forged crank in an engine that had a cast crank is not acceptable.

Incorrect. 440 crank is in the RB family, 413-426W-440 engine size, 2.750" journal size as. RB family as defined by Chrysler.
400 block is in the B family. 361-383-400 engine size as allowable in NHRA competition (other variants predate NHRA allowance for competition). B family as defined by Chrysler.

You can swap a cast crank for a forged crank application as long as the part is OEM and part of the same family. Example. You can use a 396 cast crank from a 265 horsepower Impala in your 375 horsepower Camaro engine for a weight savings. You could also use the standard small bolt rods. These are direct fit, same family applications. Truck crank, boat crank, it would not matter.

Again, "no crossbreeding of parts allowed". Also, "lightening of crankshaft other than normal balance job prohibited" Note: Per NHRA in SS you can turn down main and rod journals as much as you like.


Yes, any intake you can come up with allowable in SS as long as same configuration.

[SSDiv6]

Originally Posted by RocketBlock

Incorrect. 440 crank is in the RB family, 413-426W-440 engine size, 2.750" journal size as. RB family as defined by Chrysler.
400 block is in the B family. 361-383-400 engine size as allowable in NHRA competition (other variants predate NHRA allowance for competition). B family as defined by Chrysler.

You can swap a cast crank for a forged crank application as long as the part is OEM and part of the same family. Example. You can use a 396 cast crank from a 265 horsepower Impala in your 375 horsepower Camaro engine for a weight savings. You could also use the standard small bolt rods. These are direct fit, same family applications. Truck crank, boat crank, it would not matter.

Again, "no crossbreeding of parts allowed". Also, "lightening of crankshaft other than normal balance job prohibited" Note: Per NHRA in SS you can turn down main and rod journals as much as you like.


Yes, any intake you can come up with allowable in SS as long as same configuration.

Yes, that is exactly why I meant; I consider the RB a different family from the B engine.

[herbjr]

Rocket post with your real name and I'll continue this discussion.

Herb McCandless Jr

[Jeff Teuton]

I think the 400 is ok in ss, but not stk. I have been wrong before so don't swear on it.

[RocketBlock]

Originally Posted by herbjr

Rocket post with your real name and I'll continue this discussion.

Herb McCandless Jr

But there is nothing to discuss. No grey area. Tech needs to enforce the rules as they are printed. I'm told that is in the works. If not, just as Lynn McCarty said, open it to everybody.