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426 hemi rod #448225 08/24/09 06:18 PM 08/24/09 06:18 PM
Joined: Aug 2008 Posts: 311 New England T Tech Instructor OP enthusiast
Tech Instructor OP enthusiast T Joined: Aug 2008 Posts: 311 New England	What rod length would you use with 4.375 stroke crank?

Re: 426 hemi rod [Re: Tech Instructor] #448226 08/25/09 08:52 AM 08/25/09 08:52 AM
Joined: Jan 2003 Posts: 75,082 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,082 U.S.S.A.

Re: 426 hemi rod [Re: Tech Instructor] #448227 08/25/09 05:33 PM 08/25/09 05:33 PM
Joined: Nov 2003 Posts: 2,503 Illinois CRE2004 super gas
CRE2004 super gas Joined: Nov 2003 Posts: 2,503 Illinois	Quote: What rod length would you use with 4.375 stroke crank? Depends.....

Re: 426 hemi rod [Re: CRE2004] #448228 08/29/09 07:48 AM 08/29/09 07:48 AM
Joined: May 2006 Posts: 253 Smithfield, Rhode Island Mulehead enthusiast
Mulehead enthusiast Joined: May 2006 Posts: 253 Smithfield, Rhode Island	I'm building a hemi with a 4.375.Thinking of 6.86 or 7.01 Ain't nuthin like a HEMI !

Re: 426 hemi rod [Re: Mulehead] #448229 08/29/09 09:04 AM 08/29/09 09:04 AM
Joined: Jan 2003 Posts: 75,082 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,082 U.S.S.A.	One wants to keep the piston small , but not to small that it rocks in the bore. Going to a 4.375 stroke I wouldn't be considering a stock length rod because the CH of the piston will GROW .625 and a hemi piston is already heavy, you'll just make it heavier. You want the rod to be long enough that the piston doean't come to far out of the bore and get hit by the counterweights on the crank.

Re: 426 hemi rod [Re: Tech Instructor] #448230 08/29/09 11:07 AM 08/29/09 11:07 AM
Joined: Jan 2003 Posts: 1,938 Sonora CA Mopar_Rich top fuel
Mopar_Rich top fuel Joined: Jan 2003 Posts: 1,938 Sonora CA	Quote: What rod length would you use with 4.375 stroke crank? 7.1 is the typical rod for a stroker. Your compression height would be BH - RL - 1/2 stroke - Deck = 1.423 Block height: 10.72 (assuming the decks have been surfaced) Rod Length: 7.1 1/2 stroke: 2.1875 Deck: .010 (leaving some room for later machining) This puts the center of the pin 1.423" down which leaves enough room for rings yet keep the pin out of the oil groove.

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