New 383 troubles
Pro
Joined: Oct 2011
Posts: 554
Likes: 82
From: San Jose CA
Bloodzone, I must that I am impressed with how fast you got your new lump in and running. I am on a completely different timeframe for my diy project, I will be lucky to have it running by late fall. Probably too late for this but if you go to the GM Heritage Center > Vehicle Information Kits you can find the codes that are stamped into the differential casing that will indicate the gearing inside. Or get your car safely up on jack stands and count the number of driveshaft revolutions for one turn of a rear wheel. With 3.55 gears the shaft will rotate about 3 1/2 times,3.08 a little more than 3X, it is easy to tell the difference.
But if you don't like to get underneath your car I don't know what to say...
But if you don't like to get underneath your car I don't know what to say...
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
I'm not much of a wrench turner. Oil changes, spark plugs, breaks, thermostats about all I've ever done. Changed and flushed couple of radiators and thats about it. I dont have the means/tools to get under the car. Also I'm in a very rural part of Georgia and dont have a nice local speed shop handy. (1 stoplight town)
I should know about the rear this afternoon. At this point I'm not taking anything on faith. Even if its has 3.55 stamped I'm going to count the revolutions like Route77 suggested.
I'm hoping for a way to keep the cam with a matching stall if I have the 3.55. I was planning on a 200r4 or 700r4 in the future so this might be the right time to pull the trigger on that. I wish the cam was not as agressive but I can live with it I hope. But who knows. Depending on what I findout today I may be cam shopping this weekend.
I should know about the rear this afternoon. At this point I'm not taking anything on faith. Even if its has 3.55 stamped I'm going to count the revolutions like Route77 suggested.
I'm hoping for a way to keep the cam with a matching stall if I have the 3.55. I was planning on a 200r4 or 700r4 in the future so this might be the right time to pull the trigger on that. I wish the cam was not as agressive but I can live with it I hope. But who knows. Depending on what I findout today I may be cam shopping this weekend.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
I'm not much of a wrench turner. Oil changes, spark plugs, breaks, thermostats about all I've ever done. Changed and flushed couple of radiators and thats about it. I dont have the means/tools to get under the car. Also I'm in a very rural part of Georgia and dont have a nice local speed shop handy. (1 stoplight town)
I should know about the rear this afternoon. At this point I'm not taking anything on faith. Even if its has 3.55 stamped I'm going to count the revolutions like Route77 suggested.
I'm hoping for a way to keep the cam with a matching stall if I have the 3.55. I was planning on a 200r4 or 700r4 in the future so this might be the right time to pull the trigger on that. I wish the cam was not as agressive but I can live with it I hope. But who knows. Depending on what I findout today I may be cam shopping this weekend.
I should know about the rear this afternoon. At this point I'm not taking anything on faith. Even if its has 3.55 stamped I'm going to count the revolutions like Route77 suggested.
I'm hoping for a way to keep the cam with a matching stall if I have the 3.55. I was planning on a 200r4 or 700r4 in the future so this might be the right time to pull the trigger on that. I wish the cam was not as agressive but I can live with it I hope. But who knows. Depending on what I findout today I may be cam shopping this weekend.
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
Update:
I do have a 3.55 rear. I also have a intake vacuume leak on my turnkey crate engine.
The garage adjusted timing and carb so does not stall in drive. Its still weak off line. Pulling the intake next Tuesday to repair leak and adjust timing and carb again bla bla bla. Now is the point where I need true guidance. Which would be better?
1. add correct stall to my th350.
2. Upgrade to 200r4 or 700r4 with correct stall.
3. switch cam.
4. Switch Cam and add a stall.
I really need some good advice, I dont want to make anymore mistakes with this car.
BTW: I also have a new Street Warrior 8121 intake that I could switch out if it offered any benefits over my current intake which has a 1.5" higher dual plane.
I do have a 3.55 rear. I also have a intake vacuume leak on my turnkey crate engine.
The garage adjusted timing and carb so does not stall in drive. Its still weak off line. Pulling the intake next Tuesday to repair leak and adjust timing and carb again bla bla bla. Now is the point where I need true guidance. Which would be better?1. add correct stall to my th350.
2. Upgrade to 200r4 or 700r4 with correct stall.
3. switch cam.
4. Switch Cam and add a stall.
I really need some good advice, I dont want to make anymore mistakes with this car.
BTW: I also have a new Street Warrior 8121 intake that I could switch out if it offered any benefits over my current intake which has a 1.5" higher dual plane.
Last edited by Bloodzone; Jul 25, 2014 at 09:06 PM.
Melting Slicks
Joined: Jul 2013
Posts: 3,237
Likes: 31
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Intake leak, timing, see what you got. 2400 convertor will make a big difference with your 3.55 but if your going to upgrade to a 700R4 sometime soon, and you can afford to do it now that and the convertor will match the existing build real well. 
Last edited by 63mako; Jul 25, 2014 at 11:41 PM.
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Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
Thats what I'm leaning towards too. I've already received a quote from Bowtie Transmissions for a complete package.
The 700r4 has a 3.06 1st and the 200r4 has a 2.74 1st. which would match better with my 3.55 rear?
I know I'm a question machine. I swear if I can get this car setup I wont post for a month
The 700r4 has a 3.06 1st and the 200r4 has a 2.74 1st. which would match better with my 3.55 rear?
I know I'm a question machine. I swear if I can get this car setup I wont post for a month
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
You sure are off track with this topic ..
You need to make sure the carb is dialed in properly , timing is correct and you are 100% sure you have no vacuum leaks. Until you get to that point adding anything else is just going to cause more issues...
You need to make sure the carb is dialed in properly , timing is correct and you are 100% sure you have no vacuum leaks. Until you get to that point adding anything else is just going to cause more issues...
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
I agree 100% and thats my plan. Leak fix is scheduled for next Tuesday. Timing and carb will be redone then as well. Then maybe in a week or so I can add the stall converter or od transmission.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
I am betting if the motor is set up right all the gear and tranny ideas can wait ...
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
That would nice. I would have a smile and little more money in my pocket. Right now (with my intake leak) if I punch it from a dead stop takes 1 or 2 seconds for the rpms to get up then the car really launches. But its really slow for those 1 or 2 seconds with zero tire spin. To me that says needs stall converter but I'm a rookie and guessing.
I'm not gonna get ahead of myself. Nothing will be done till motor is 100%
I'm not gonna get ahead of myself. Nothing will be done till motor is 100%
Race Director
Joined: Feb 2006
Posts: 12,239
Likes: 19
From: Chino CA
That would nice. I would have a smile and little more money in my pocket. Right now (with my intake leak) if I punch it from a dead stop takes 1 or 2 seconds for the rpms to get up then the car really launches. But its really slow for those 1 or 2 seconds with zero tire spin. To me that says needs stall converter but I'm a rookie and guessing.
I'm not gonna get ahead of myself. Nothing will be done till motor is 100%
I'm not gonna get ahead of myself. Nothing will be done till motor is 100%
Fix the intake leak. It's SIMPLE and CHEAP.
But you need the stall.
My blueprint 383 is a tire burning SOB...the stall let's the engine get the RPM's up.
Race Director
Joined: Feb 2006
Posts: 12,239
Likes: 19
From: Chino CA
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
My thought is if you plan on changing to a 700R4 at some point and you don't do your own work I would not pay to pull the trans, buy and install convertor and reinstall trans knowing it was all going to be redone and you will pay for these operations twice. Don't know how durable the factory original TH350 will be behind 425 HP and a 2400 stall long term. it all depends on the available cash, long term plans and end goals. I would likely get it going as is and wait till winter and all parts are secured before changing anything.
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
Thats what I'm leaning towards too. I've already received a quote from Bowtie Transmissions for a complete package.
The 700r4 has a 3.06 1st and the 200r4 has a 2.74 1st. which would match better with my 3.55 rear?
I know I'm a question machine. I swear if I can get this car setup I wont post for a month
The 700r4 has a 3.06 1st and the 200r4 has a 2.74 1st. which would match better with my 3.55 rear?
I know I'm a question machine. I swear if I can get this car setup I wont post for a month