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Hemi Guys----Stroke/Rod Question??? #685879 05/01/10 08:45 PM 05/01/10 08:45 PM
Joined: Jan 2003 Posts: 2,533 Alexandria, LA B Blucuda413 OP master
Blucuda413 OP master B Joined: Jan 2003 Posts: 2,533 Alexandria, LA	Building a hemi for a blower and was wondering which rod/stroke combination would be best of these 2. I currently have the 4.5 bore pistons so that measurement is fixed. Would it be better to go with a 4.15 stroke and a 6.86 rod or a 4.25 stroke with a 6.76 rod?? New to hemi so exploring options!!!

Re: Hemi Guys----Stroke/Rod Question??? [Re: Blucuda413] #685880 05/01/10 08:55 PM 05/01/10 08:55 PM
Joined: Aug 2003 Posts: 43,172 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,172 Bend,OR USA	4.25 stroke and a 7.100 long rod Especially a blower motor the last blown 426 hemi motor I built I used a 4.375 stroke with a 7.100 long rod and a 4.255 bore Motor made 924 HP at 7300 RPM with 7 lbs boost on CA pump gas Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Hemi Guys----Stroke/Rod Question??? [Re: Cab_Burge] #685881 05/01/10 08:57 PM 05/01/10 08:57 PM
Joined: May 2004 Posts: 12,387 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,387 Taxes & Virus's R-US, NY	Quote: 4.25 stroke and a 7.100 long rod Especially a blower motor the last blown 426 hemi motor I built I used a 4.375 stroke with a 7.100 long rod and a 4.255 bore Motor made 924 HP at 7300 RPM with 7 lbs boost on CA pump gas Ditto, but if he already has the pistons, it might not fit....Love the bob weights on the 7.1 rods with chevy journals....So nice and light. '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: Hemi Guys----Stroke/Rod Question??? [Re: Blucuda413] #685882 05/02/10 01:23 AM 05/02/10 01:23 AM
Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada N NitroFixx member
NitroFixx member N Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada	I would sell the larger bore pistons and look for pistons in the 4.310 - 4.375 range with either 7.076 or 7.125 length rods turning on a 3/4 stroker crankshaft.

Post deleted by Defbob [Re: NitroFixx] #685883 05/02/10 04:16 AM 05/02/10 04:16 AM
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Re: Hemi Guys----Stroke/Rod Question??? #685884 05/02/10 05:46 AM 05/02/10 05:46 AM
Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...	Go with the rod that will give you the deck height you need. You have a difference of .050 between the two combinations, which will change the compression. The 4.15 stroke 7.86 combo will be .050 higher than the 4.25 stroke 6.76 combo. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

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