Author Topic: 440 Upgrade update...  (Read 8670 times)

Offline roadman5312

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Re: 440 Upgrade update...
« Reply #15 on: September 04, 2014 - 05:20:41 PM »
Percys Seal 4 Good, best I have found, never a leak.  :2cents:




Offline gafletch

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Re: 440 Upgrade update...
« Reply #16 on: September 14, 2014 - 06:52:23 PM »
Engine is back together. Much better performance rpm-wise. I'm getting 6100 before float.  May need larger plug in for MSD box.
Removed nitrous hardware but 750 Holley still jetted to big. Carbons up.
Former race car getting more street worthy, lol.
Next: fine tuning, time run at strip, replace LOUD
"Spin Tech" almost-mufflers with Flowmasters. My apologies to my good neighbors, lol. Parts listed in "parts for sale".   :D

Offline Chryco Psycho

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Re: 440 Upgrade update...
« Reply #17 on: September 14, 2014 - 08:28:16 PM »
I would use Dynomax super turbos over flowmasters but that is me

Challenger - You`ll wish You Hadn`t

Offline gafletch

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Re: 440 Upgrade update...
« Reply #18 on: September 21, 2014 - 11:44:12 PM »
If someone can post pics for me I'll email some to you.

I'm getting 6,000 rpm now instead of 5, so that's much better. I get up to 110 mph before flutter, that's 10 mph more. But I know this torque monster has more in it, lol.  I'm sure it's a mid to low 12 second setup with some fine tuning at around 120?  So shoot some suggestions out.

My suspicion is the Holley 750 that was jetted for nitrous. It runs way rich, and I still get carbon build up. Some of you recommended an 850 carb and I may go that route. But I'd like to rejet this 750 first to see if that helps. What size jets?

She looks good though, and i can't get away from a gas station without someone taking pictures.  :thumbsup:

Offline Chryco Psycho

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Re: 440 Upgrade update...
« Reply #19 on: September 22, 2014 - 12:28:44 AM »
750 primry side should be around 72-74 jet

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Offline gafletch

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Re: 440 Upgrade update...
« Reply #20 on: October 08, 2014 - 06:12:22 PM »
Ok guys, the changes improved the rpm from 5,000 to 6,000. Neal, you recommended going from a 750 to an 850 carb. I read that you like Proform. EBay has a street strip Proform for around $460. That's $110 less than a Quick Flow. Which Proform model do you recommend? Thanks, Greg.

Offline Chryco Psycho

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Re: 440 Upgrade update...
« Reply #21 on: October 08, 2014 - 09:34:02 PM »
If you do not run it in cold weather I go with the race series Proform
 

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Offline CudamanTom

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Re: 440 Upgrade update...
« Reply #22 on: October 09, 2014 - 06:56:19 AM »
Percys Seal 4 Good, best I have found, never a leak.  :2cents:

 :iagree:
I use these as well. Not a problem.  :2thumbs:
1971 Cuda Vert 440-833 - (clone)
1971 Cuda 440-727 - (clone)


Because I like it fast!!!

Offline gafletch

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Re: 440 Upgrade update...
« Reply #23 on: October 12, 2014 - 06:18:16 PM »
What is it about  the race one that's  better than the street carb?

Offline Chryco Psycho

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Re: 440 Upgrade update...
« Reply #24 on: October 12, 2014 - 09:22:24 PM »
As far as I know they are the same except for the choke system

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Offline HP_Cuda

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Re: 440 Upgrade update...
« Reply #25 on: October 13, 2014 - 12:00:10 PM »
Yep no choke to deal with.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD