What rods to use; 4.25" stroke Hemi
#1429093
05/02/13 09:07 AM
05/02/13 09:07 AM
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Joined: Sep 2003
Posts: 1,260 Netherlands
72Challenger
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,260
Netherlands
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Have a stock bore 426 block and a Eagle 4.25 stroke (part# 444242507100) crank for it.
Now need to sort out which rods and pistons to use for a final compression of around 10:1
Any input? Greatly appreciated!
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Re: What rods to use; 4.25" stroke Hemi
[Re: 72Challenger]
#1429094
05/02/13 10:02 AM
05/02/13 10:02 AM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
master
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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A LONG ROD LIKE 7.1 IS VERY POPULAR. IT ALLOWS A SHORTER AND LIGHTER PISTON
home of the Sox and Martin Hemi Duster
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Re: What rods to use; 4.25" stroke Hemi
[Re: HEMIFRED]
#1429095
05/02/13 10:09 AM
05/02/13 10:09 AM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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Just ordered a set of 7.100" BBC Molnar Technologies rods from Dan at Performance Only for a 540" Hemi I'm working on.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: What rods to use; 4.25" stroke Hemi
[Re: 72Challenger]
#1429098
11/07/13 10:48 AM
11/07/13 10:48 AM
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Joined: Jan 2003
Posts: 5,138 East Aurora (Buffalo) NY
RoadRunner
master
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master
Joined: Jan 2003
Posts: 5,138
East Aurora (Buffalo) NY
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Just took delivery of an old hemi that was used and abused in racing service. Looking to get it put into my street car. I was doing some searching and came across this thread. So I figured I hijack and build upon it. Can you use a 4.25 strok crank in on of the MP blocks? I need to replace the block, but looking to use the rotating assembly heads and intake off the race motor. Thanks.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1
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Re: What rods to use; 4.25" stroke Hemi
[Re: RoadRunner]
#1429099
11/07/13 01:37 PM
11/07/13 01:37 PM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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I'd go 7.1 with a .990 pin...try to get that heavy Hemi piston as light as possible and the rod ratio will benefit the high piston speeds with the tall 10.72" deck. On an RB 10.72 deck wedge it's not as critical and a 6.7-6.86 rod is fine , on a hemi go for the longer rod
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Re: What rods to use; 4.25" stroke Hemi
[Re: Streetwize]
#1429100
11/07/13 03:00 PM
11/07/13 03:00 PM
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Joined: Jan 2003
Posts: 8,847 poplar bluff mo.
toplescuda
I Whine
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I Whine
Joined: Jan 2003
Posts: 8,847
poplar bluff mo.
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I also have a 4.250 stroke crank for my 488 hemi......can you get a piston with low enuff compression to use a 7.1 rod with a blower?
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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Re: What rods to use; 4.25" stroke Hemi
[Re: Streetwize]
#1429102
11/07/13 04:13 PM
11/07/13 04:13 PM
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Joined: Jan 2003
Posts: 8,847 poplar bluff mo.
toplescuda
I Whine
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I Whine
Joined: Jan 2003
Posts: 8,847
poplar bluff mo.
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Now just need to fig out what final compression i need
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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