Re: is 4.56's too much for me?
[Re: carolinacuda]
#689305
05/05/10 09:11 AM
05/05/10 09:11 AM
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Joined: Oct 2004
Posts: 8,165 Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
Hey fellas. I was thinking of using my 4.56 gears which have been sitting on shelf for several yrs now. My 74 cuda with a mild 440 has 3.91's in it now. I have a 3600 stall and run a hughes solid cam 252/256 @50 with 572.579 lift ,108lsa. Indy Ez's with Eddy victor Int. My 60 ft is around 1.60 and my eigth is 7.25 and 1/4 of 11.48 at 117. I shift at 6200 and cross line at about 6000. Im using a 28'tire. I figured those 4.56's were too much with that tire. Not sure what to do yet. I mostly drive on street (city drivin though)
Too tall for the street and probably marginal for the strip.
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Re: is 4.56's too much for me?
[Re: carolinacuda]
#689309
05/05/10 12:08 PM
05/05/10 12:08 PM
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Joined: Apr 2007
Posts: 2,026 Trumbull,CT.
jim sciortino
top fuel
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top fuel
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
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Quote:
Hey fellas. I was thinking of using my 4.56 gears which have been sitting on shelf for several yrs now. My 74 cuda with a mild 440 has 3.91's in it now. I have a 3600 stall and run a hughes solid cam 252/256 @50 with 572.579 lift ,108lsa. Indy Ez's with Eddy victor Int. My 60 ft is around 1.60 and my eigth is 7.25 and 1/4 of 11.48 at 117. I shift at 6200 and cross line at about 6000. Im using a 28'tire. I figured those 4.56's were too much with that tire. Not sure what to do yet. I mostly drive on street (city drivin though)
Most cars do not see there best ET with a shift point higher then cross rpm.
The only way to find out is try them and different shift/cross rpms.
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Re: is 4.56's too much for me?
[Re: carolinacuda]
#689311
05/05/10 12:23 PM
05/05/10 12:23 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Look at your gear change as a percentage and then figure that percentage change in your rpm(I dont see it being a problem) but if you spin the tires you arent gaining anything... JMO
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Re: is 4.56's too much for me?
[Re: MR_P_BODY]
#689312
05/05/10 02:43 PM
05/05/10 02:43 PM
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Joined: Jan 2003
Posts: 9,146 Now - Port Orange,Fla. Former...
MIKES_DUSTER
master
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master
Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
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My uncles has a 68 RR with a mild 440,.509 hyd cam,10:1,mild heads,3800 converter,28x14.5 QTP's with 4.56. It goes low 11's,shift around 6400-6500 and cross the same. RUN'EM!!!!!!
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383man
[Re: carolinacuda]
#689314
05/06/10 02:06 AM
05/06/10 02:06 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Hey fellas. I was thinking of using my 4.56 gears which have been sitting on shelf for several yrs now. My 74 cuda with a mild 440 has 3.91's in it now. I have a 3600 stall and run a hughes solid cam 252/256 @50 with 572.579 lift ,108lsa. Indy Ez's with Eddy victor Int. My 60 ft is around 1.60 and my eigth is 7.25 and 1/4 of 11.48 at 117. I shift at 6200 and cross line at about 6000. Im using a 28'tire. I figured those 4.56's were too much with that tire. Not sure what to do yet. I mostly drive on street (city drivin though)
Wow my 63 would be a good race with your Cuda as my best is 11.49. I can tell you I use 906 heads I did some porting on. I run 4.30's with a 30" radial Hoosier slick. I drive on the street all the time like that. I shift about 6200 and hit the stripe about 6400 and I have the MP .557 solid cam. 4.56's with a 28" tire will be twisting your 440 pretty good for the combo. But you do have Indy EZ heads and a Victor intake (I use the Holley SD) so it may handle it. I am thinking if you shift about 6400 you should trap around 6600 maybe ??? Good luck , Ron
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Re: 383man
[Re: 383man]
#689315
05/06/10 02:19 AM
05/06/10 02:19 AM
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Joined: Nov 2004
Posts: 2,825 Sk. Canada
RemCharger
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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I'd say it might come down to a maximum of 1-1/2 - 2 tenths. Is it worth it considering your city driving... maybe not. Would I put them in? Absolutely.
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Re: is 4.56's too much for me?
[Re: carolinacuda]
#689316
05/06/10 06:58 AM
05/06/10 06:58 AM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Well first I get a shift point for that engine of 7000 to 7200. try 6800 and work your way up!! those heads really like it up high. you not giving that intake and those heads a chance to show their stuff. I ran 4.56 on the street with 4.56 gears fine if you don't cruise the highway too much 4000 rpm is 72 mph with 28 inch tall tires. Thes motors will cruise all day at 4000. 2 to 3 tenths for the 4.56 (likely 3 tenths quarter and .2 in the 1/8) shifting it a 7000 will likely net .2 to .3 more ?? but with a 28 inch tire look for high 10's but 7000 out the end. Perfect for your motor would be 29.5 slicks with the 4.56 or 4.30 gear and 28 inch tall either would still give 11.00's at 6800 out the end
Last edited by Dodgem; 05/06/10 07:00 AM.
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