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4,5 bore HEMI + 4,375 crank: which length rods? #949893 03/13/11 02:54 PM 03/13/11 02:54 PM
Joined: Jan 2003 Posts: 9,670 Lima, Peru domingo OP EL Master
domingo OP EL Master Joined: Jan 2003 Posts: 9,670 Lima, Peru	Hi! I have a 4,5" bore HEMI cast iron Megablock and a 4,375" stroke Bryant Billet crank. It will a naturally aspirated engine, I will use Stage V raised port exh heads and Im not sure about the intake....maybe an Indy or a used SS fabbed intake if I can get my hands on one thats not cutting edge for the class anymore... I want to run on pump gas and try to make 900-1000 hp. (not sure if it's possible). Which length rods do you think I should use? Thanks Domingo

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: domingo] #949894 03/13/11 03:00 PM 03/13/11 03:00 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	7.1 or longer What size are the crankshaft rod journals? If BB Chevy there are a lot of choices on brand, style and materailas for us Mopr engine lovers The longer the rod the lighter weight the pistons will be, the lighter the piston the better the motor will rev up, and slow down Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: Cab_Burge] #949895 03/13/11 03:49 PM 03/13/11 03:49 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Quote: 7.1 or longer What size are the crankshaft rod journals? If BB Chevy there are a lot of choices on brand, style and materailas for us Mopr engine lovers The longer the rod the lighter weight the pistons will be, the lighter the piston the better the motor will rev up, and slow down With that much of a long arm stroke any shorter rods will put the piston skirts into the counter weights. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: Cab_Burge] #949896 03/13/11 03:59 PM 03/13/11 03:59 PM
Joined: Jun 2009 Posts: 1,212 QLD Australia Keith Black® pro stock
Keith Black® pro stock Joined: Jun 2009 Posts: 1,212 QLD Australia	Quote: 7.1 or longer What size are the crankshaft rod journals? If BB Chevy there are a lot of choices on brand, style and materailas for us Mopr engine lovers The longer the rod the lighter weight the pistons will be, the lighter the piston the better the motor will rev up, and slow down -------------------------------- Darren Beale Keith Black Racing Engines®

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: domingo] #949897 03/13/11 04:51 PM 03/13/11 04:51 PM
Joined: Oct 2010 Posts: 126 Nevada T theman440 member
theman440 member T Joined: Oct 2010 Posts: 126 Nevada	As long as possible.

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: theman440] #949898 03/13/11 05:25 PM 03/13/11 05:25 PM
Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY HEMIFRED master
HEMIFRED master Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY	not mentioned here is that wriist pin location and comp height will determine what the right rod to match should be. Off the shelf pistons will be made for a matching length rod. I would see what piston might work without being custom made. 7.100 is the most common otherwise you might wind up with the wrong combination home of the Sox and Martin Hemi Duster

Re: 4,5 bore HEMI + 4,375 crank: which length rods? [Re: HEMIFRED] #949899 03/13/11 05:46 PM 03/13/11 05:46 PM
Joined: Jan 2003 Posts: 9,670 Lima, Peru domingo OP EL Master
domingo OP EL Master Joined: Jan 2003 Posts: 9,670 Lima, Peru	Quote: not mentioned here is that wriist pin location and comp height will determine what the right rod to match should be. Off the shelf pistons will be made for a matching length rod. I would see what piston might work without being custom made. 7.100 is the most common otherwise you might wind up with the wrong combination Yep. My question was more along these lines... I will check what rod journals do I have... D

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