NHRA ACCEPETD AFTER MARKET CRANKSHAFTS

RPinoski1 · 04-02-2007, 10:36 AM

Can anyone guide me to the list of accepted aftermarket cranks?????

SSDiv6 · 04-02-2007, 03:01 PM

Crower is the only company that has a small block Chevy crank that has been in use for some time. It has a factory part number too.

http://www.crower.com/pdf/173-188.pdf

They are under the "Stock Plus" and "Pure Stock" names.

04-02-2007, 08:41 PM

Raw GM crank forgings are shipped directly from
GM?s foundry to Crower. Stock GM part number is
forged into the counterweight. Features include lightening
holes and O.D. trimming that reduces weight
by 4 to 5 lbs under stock. Crower race-prep includes
1⁄8 radii and Crower heat-treat. Thorough magna-flux
inspection, chamfered oil holes, end-to-end index
check and polishing come standard. Crower even
straightens them so you don?t have to. Complete
stock legal engine kits also available.
WEIGHT: 51 lbs (4 to 5 lbs under stock GM weight

This is the "Stock Plus" crankshaft. Why would NHRA allow "lightening
holes and O.D. trimming that reduces weight
by 4 to 5 lbs under stock"?
Is there a limit to OD trimming? If OD trimming why not all the other mods in the other series (eliminate center CW, profile milling, wing contour, etc.)?

NHRA #7494 SS/H
1970 AMC AMX 390
"Best Appearing" @ NHRA '06 Pacific Sports Nationals
Arizona's BEST Realtor supports racers!
Now celebrating 14 years as a Realtor,
Call me @ 602-418-9797 or JeffLeeAzRealty@Qwest.net

04-02-2007, 10:36 AM	#1
RPinoski1 Member Join Date: Jan 2002 Location: PLACERVILLE, CA Posts: 182 Likes: 0 Liked 0 Times in 0 Posts	NHRA ACCEPETD AFTER MARKET CRANKSHAFTS Can anyone guide me to the list of accepted aftermarket cranks????? __________________ "I've never seen a Hearse with a Luggage Rack, You Can't Take it With You" Mike Ness

04-02-2007, 03:01 PM	#2
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 2,999 Likes: 693 Liked 1,470 Times in 550 Posts	Crower is the only company that has a small block Chevy crank that has been in use for some time. It has a factory part number too. http://www.crower.com/pdf/173-188.pdf They are under the "Stock Plus" and "Pure Stock" names.

04-02-2007, 08:41 PM	#3
Jeff Lee Guest Posts: n/a	Raw GM crank forgings are shipped directly from GM?s foundry to Crower. Stock GM part number is forged into the counterweight. Features include lightening holes and O.D. trimming that reduces weight by 4 to 5 lbs under stock. Crower race-prep includes 1⁄8 radii and Crower heat-treat. Thorough magna-flux inspection, chamfered oil holes, end-to-end index check and polishing come standard. Crower even straightens them so you don?t have to. Complete stock legal engine kits also available. WEIGHT: 51 lbs (4 to 5 lbs under stock GM weight This is the "Stock Plus" crankshaft. Why would NHRA allow "lightening holes and O.D. trimming that reduces weight by 4 to 5 lbs under stock"? Is there a limit to OD trimming? If OD trimming why not all the other mods in the other series (eliminate center CW, profile milling, wing contour, etc.)? NHRA #7494 SS/H 1970 AMC AMX 390 "Best Appearing" @ NHRA '06 Pacific Sports Nationals Arizona's BEST Realtor supports racers! Now celebrating 14 years as a Realtor, Call me @ 602-418-9797 or JeffLeeAzRealty@Qwest.net