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Re: new distributor [Re: Cab_Burge] #2769835
04/30/20 02:19 PM
04/30/20 02:19 PM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
mopar
8urvette  Offline OP
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wine country
Originally Posted by Cab_Burge
Originally Posted by 8urvette
.
I know 400 is very attainable from a 383 of this build- do you guys think a mopar cam is the way to go?
NOOOOO tsk
Is this cam degreed? If not do that first.
If it is degree what are the specs on the duration at .050 and LSA and intake lobe center?
I'm still thinking you have a lean pop at light part throttle application, driving twocents Or maybe a vacuum leak work


the cam is degreed, cam card said 112 or 113. it was at 114, i tried 112 and now 108 and no change.

The carb is a 870 vacuum secondaries, i have tried 2 distributors,... checked for vacuum leaks at the carb, and intake with spray. saw no change.
adjusted valves multiple times. No change, it pops and backfires through the carb. Timing has been adjust from 5 ATDC Through- 20 BTDC


Thoughts?

Re: new distributor [Re: 8urvette] #2769966
04/30/20 09:22 PM
04/30/20 09:22 PM
Joined: Aug 2003
Posts: 35,510
Bend,OR USA
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Cab_Burge Offline
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I did not look back to find the cam specs but any time I hear 112,113 LSA on a N/A BB Mopar I cringe unless it is for power brakes.
All the BB I've play with N/A except one B1 bracket motor liked cams ground on 110 or narrower LSA, the B1 motor had a solid roller race cam ground from Koffels on a 111 LSA installed at 109 ATDC on the intake lobe and it made 920 HP at or around 7000 RPM with single Dominator carb on a cast single four barrel B1 intake shruggy
Have you done a compression test and or a leak down test on all 8 cylinders?
If not I would so I could be sure none of the intake valves are staying opened or bent work scope
383 motors are a short stroke motor so they don't have the torque or power that the BB do so to get them to make good power you have to revved them up (above 6000 RPM) and keep them revved up in the power band shruggy

Last edited by Cab_Burge; 04/30/20 09:24 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: new distributor [Re: Cab_Burge] #2770007
04/30/20 11:31 PM
04/30/20 11:31 PM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
mopar
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wine country
I pulled a 600 cfm carb off my caddy with a SBC, dropped it on and the car runs great! No backfire, no pop, great throttle response.

This is an older model with manual choke and single fuel inlet. It started right up, and idled great. revved it and no backfire, took it for a drive and it drove great.

Why does the carb I took off a Holley Avenger 870, run like poo? Power valve was fine, no vacuum leaks i could find.

I started the car on the avenger, revved it, and it backfired. Swapped the carbs started it, revved it and no back fire.

No changes, reused the carb base gasket, NO tuning changes, same timing. WHAT THE HECK!!!! THIS WAS A BRAND NEW HOLLEY!?!?!?!?!?!?

Re: new distributor [Re: 8urvette] #2770058
05/01/20 08:58 AM
05/01/20 08:58 AM
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IL
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Dart451 Offline
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Assuming low cost provider on parts. Check see if all air bleeds, jet passageways ect are clean.

I was thinking the carb was giving problems my friend was fighting the same issue. i took one of my old carbs over and his car ran fine.

Last edited by Dart451; 05/01/20 09:00 AM.
Re: new distributor [Re: 8urvette] #2770061
05/01/20 09:13 AM
05/01/20 09:13 AM
Joined: Jan 2007
Posts: 6,927
Mt Morris Michigan
mopar dave Offline
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That's just what I thought. The carb. IF not that something more serious in engine like cab said. Glad you found it. Dom@Thumper carbs finds a lot of junk in brand new holleys. The junk is left in the main well of the metering blocks.

Re: new distributor [Re: mopar dave] #2770184
05/01/20 03:39 PM
05/01/20 03:39 PM
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8urvette Offline OP
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Rather than spend a hundred bucks on the rebuild, i went ahead and purchased the Sniper EFI.

This was the end goal, just now had a reason to pull the trigger.

The 8 3/4" rear end is a XXXX657 center chunk. it is a 3.91 Posi unit, it came from my barracuda years ago. It now whines / howls going down the road. There is also a random odd vibration the can be heard and felt, and goes away once shifted into neutral.

Thinking bearings are worn on the center chunk, and this is causing the random vibration. I also have a 742 housing, sure grip but it has 3.23 gears. Should I just swap that and not worry about the 657? With the gear vendors i would like to keep the 3.91 though.

how do I check if the gears are worn out? Do i have to pull the pig and use a dial indicator?

Re: new distributor [Re: 8urvette] #2770187
05/01/20 03:49 PM
05/01/20 03:49 PM
Joined: Jun 2003
Posts: 52,728
Romeo MI
MR_P_BODY Online content
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Romeo MI
If you know the 742 is good.. just try swapping it
wave

Re: new distributor [Re: MR_P_BODY] #2770202
05/01/20 04:34 PM
05/01/20 04:34 PM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
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i don't know... all it ever did in my barracuda was burn out!

Re: new distributor [Re: 8urvette] #2770214
05/01/20 05:16 PM
05/01/20 05:16 PM
Joined: Jun 2003
Posts: 52,728
Romeo MI
MR_P_BODY Online content
Master
MR_P_BODY  Online Content
Master

Joined: Jun 2003
Posts: 52,728
Romeo MI
Originally Posted by 8urvette
i don't know... all it ever did in my barracuda was burn out!


Then have some shop set it up for you
wave

Re: new distributor [Re: MR_P_BODY] #2770272
05/01/20 10:12 PM
05/01/20 10:12 PM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
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I would prefer to do it myself.

Took it for a test drive tonight. was running kinda weird, little stumble in first gear, not a lot of power till about 3k rpms.
Then it died on me. Just died rolling up to a stop light. Would not restart. Didn't hiccup, fart or couch. Just cranked.

I checked all the connections and fuses for the ignition. All good. I cranked it several more times over a few minutes. Nothing.
I decided it was a good time to watch good ol youtube. After a 10 minute video, i hit the key and it fired right up.

Ran better than it did earlier, no stumble, no hesitation. I just drove it home.

This happened the other night, except it just wouldn't start. I checked for spark then and had none. I messed with a connection for 12v. and then it started, i had assumed it was a bad connection, so i replaced it. I am now thinking this wasn't the issue it was purely coincidental.

It has fuel, and it has air, so it must be spark.

MSD 6AL and MSD coil. would the coil be most likely to heat up and cause an open? then cool down and work? or would the 6AL be more likely to do that?

Since i got it home everything works so i can't very well check it now. Just looking for a game plan.

Last edited by 8urvette; 05/01/20 10:13 PM.
Re: new distributor [Re: 8urvette] #2770274
05/01/20 10:14 PM
05/01/20 10:14 PM
Joined: Aug 2003
Posts: 35,510
Bend,OR USA
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Cab_Burge Offline
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If my memory is serving me correct the" 657" carrier was made before the 742 was, maybe prior to 1962, I have seen on here that they both use the same size pinion gear , seals and pinion bearing, I'm not sure if that is correct or not though confused
I remember seeing one in a 1957 or 1958 Plymouth Savoy flat head stick shift car that had 3.73 gears in it, I wish now that I had bagged that rascal but I didn't realcrazy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: new distributor [Re: 8urvette] #2770518
05/02/20 06:49 PM
05/02/20 06:49 PM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
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Posts: 534
wine country
Originally Posted by 8urvette
I would prefer to do it myself.

Took it for a test drive tonight. was running kinda weird, little stumble in first gear, not a lot of power till about 3k rpms.
Then it died on me. Just died rolling up to a stop light. Would not restart. Didn't hiccup, fart or couch. Just cranked.

I checked all the connections and fuses for the ignition. All good. I cranked it several more times over a few minutes. Nothing.
I decided it was a good time to watch good ol youtube. After a 10 minute video, i hit the key and it fired right up.

Ran better than it did earlier, no stumble, no hesitation. I just drove it home.

This happened the other night, except it just wouldn't start. I checked for spark then and had none. I messed with a connection for 12v. and then it started, i had assumed it was a bad connection, so i replaced it. I am now thinking this wasn't the issue it was purely coincidental.

It has fuel, and it has air, so it must be spark.

MSD 6AL and MSD coil. would the coil be most likely to heat up and cause an open? then cool down and work? or would the 6AL be more likely to do that?

Since i got it home everything works so i can't very well check it now. Just looking for a game plan.


Nobody has had an issue with their MSD cutting out while driving?

Re: new distributor [Re: 8urvette] #2770533
05/02/20 07:56 PM
05/02/20 07:56 PM
Joined: Aug 2003
Posts: 35,510
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
You have a bad connectio, or corrosion, in the circuit feeding 12V to the MSD box or between the box and coil or maybe the mag pickup connections scope
Something is heating up and breaking the connection stopping the power to one of those components scope
Once it cools down and shrinks back down it works correct work
How close to the ocean do you park the car or are you in the bay area where it gets really foggy ?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: new distributor [Re: Cab_Burge] #2774800
05/15/20 11:44 AM
05/15/20 11:44 AM
Joined: Jul 2011
Posts: 534
wine country
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8urvette Offline OP
mopar
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wine country
UPDATE-
I ordered a Sniper kit, Sniper CDI, Sniper coil, and hyper spark distributor.

I cannot compliment Holley enough on how well this system installs and user friendly it is. It bolts right in, no weird modifications just plug and play. Once it was all installed I let the fuel pump prime and then cranked it. Fired right up! high idle then came down to the 900 rpm idle i set up.

I have been putting miles on the car fixing all the small issues, little electrical things and weird noises etc..

The back fire happened a few times, but watching the touchscreen it would go very lean just off idle and then pop. The system is a self learning setup so after several miles this has gone away. I also added some fuel at throttle tip in to help out.

Now with the EFI and Gear vendors this car runs great, cruises down the road like a well built car. The rear end does whine at 60MPH+ under load, so I will swap out the 657 pig with the 3.91s to the 742 I have with 3.23. Both are positive units.

Re: new distributor [Re: 8urvette] #2775037
05/16/20 08:59 AM
05/16/20 08:59 AM
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Posts: 624
IL
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Dart451 Offline
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Good to hear, now they need to take that junk carb they sold you back lol

Re: new distributor [Re: 8urvette] #2775176
05/16/20 04:51 PM
05/16/20 04:51 PM
Joined: Jan 2007
Posts: 6,927
Mt Morris Michigan
mopar dave Offline
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Glad to see you got the issues behind you. Happy roddin

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