Thats what I bought- stage 2.
New 383 setup/tuning question
Racer
Joined: Oct 2004
Posts: 285
Likes: 0
From: Stockholm
You're running too much timing. If those are fast burn heads, you need to be down around 28 to 32. If they're not fast burn, you should be at 36 max. But make the curve come in quick, and make the curve short enough to allow about 18 degrees initial timing while limiting the total to the above noted specs.
How will the 6* affect the performance?
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
"curtis73
Registered User Join Date: Dec 2005
Location: Los Angeles
Posts: 1,721
Fast Burn is a name that GM came up with. It really is a great technology and really does work as well as it says. There are aftermarket fast burn heads, usually copied from GMs chambers.
The general idea is to shape the combustion chamber in such a way that the rising piston meets a specially shaped deck. It attempts to make optimum squish or quench, which is a fancy way of saying it squishes all the charge out into the combustion chamber making it turbulent. Turbulent = well mixed = fewer liquid droplets of fuel = fast flame front. All of that equals to better detonation resistance, less ignition lead, better economy, and more power. It hasn't solved all the worlds problems, but it has taken a significant leap forward in all of those parameters. "
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
No. I was honest with them and admitted I did not have a tranny cooler built into my radiator. This info was disclosed prior to me ever even driving the car. They voided the warranty on the spot,even though I explained I was running a 10x17" external cooler,that had worked perfectly on my th350 for years.
For what it's worth I installed a temp guage and after the 700r4 was rebuilt locally I monitored the temps for a year,and it never went over 170 degrees.Usually closer to 150.
If I lived in California,somebody at BTO would have had a 700r4 dropped on his desk for sure.
For what it's worth I installed a temp guage and after the 700r4 was rebuilt locally I monitored the temps for a year,and it never went over 170 degrees.Usually closer to 150.
If I lived in California,somebody at BTO would have had a 700r4 dropped on his desk for sure.
Thread Starter
Heel & Toe
Joined: Feb 2007
Posts: 19
Likes: 0
Lars, I saw you gave a recommendation for a vac can P.N. for another cam on a vac adv post. Can I ask you what is your recommendation for this hyd roller .246 int 254 ex. at .050 and 558 lift int and ex. 112 lobe center? 383 ci.
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Racer
Joined: Apr 2005
Posts: 464
Likes: 0
From: Charleston South Carolina
Thread Starter
Heel & Toe
Joined: Feb 2007
Posts: 19
Likes: 0
Ok, used infrared temp gun and #2 cylinder is way colder than the other 7. Pulled the plug wire and the motor fell off in rpm consistant with the others when they were removed. Exhaust is noticably weaker on that bank of cylinders at the tailpipe. Compression check on that cylinder next should tell something. Any scenarios? Rings not yet seated? Only one hour on the motor.
Burning Brakes
Joined: May 2007
Posts: 945
Likes: 0
From: Ventura California
Ok, used infrared temp gun and #2 cylinder is way colder than the other 7. Pulled the plug wire and the motor fell off in rpm consistant with the others when they were removed. Exhaust is noticably weaker on that bank of cylinders at the tailpipe. Compression check on that cylinder next should tell something. Any scenarios? Rings not yet seated? Only one hour on the motor.
Racer
Joined: Oct 2004
Posts: 285
Likes: 0
From: Stockholm
Ok, used infrared temp gun and #2 cylinder is way colder than the other 7. Pulled the plug wire and the motor fell off in rpm consistant with the others when they were removed. Exhaust is noticably weaker on that bank of cylinders at the tailpipe. Compression check on that cylinder next should tell something. Any scenarios? Rings not yet seated? Only one hour on the motor.
When I started up my 383, two of my exhust ports where a lot colder than the other six, measured with a temp gun.
I couldn't just understand why.
The problem was caused by a vacum hose that wasn't connected.
After when I connected it the temp became equal on all eight cylinders.
I don't understand any logic in it, but the missing hose was the solution.
Thread Starter
Heel & Toe
Joined: Feb 2007
Posts: 19
Likes: 0
Progress! I determined the flywheel is on backwards. I had this engine and bto 700r4 trans installed by a local corvette shop. They race corvettes but must have smoked some grass the day they installed it. This puts the weight 180 degrees off and is undoubtedly what was making this motor not seem happy. What a relief, i suspected this earlier but was ***-ured that it was on correctly. Explains my starter problems too. With the inspection cover off, it was apparent it was incorrect. Now if anyone can tell me how to adjust the valves when the spec is 3-4 thousanths preload on a warm engine for my comp pro hyd rollers. 0 lash plus 1/
24th turn? Sheesh.
24th turn? Sheesh.
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Street avenger on a performance engine 
If you'd go with a mechanical secondaries 4150 carb, you'd probably pick up 20 RWHP over that carb without reducing streetability (as street driving is usually done on the primaries anyways).
If you'd go with a mechanical secondaries 4150 carb, you'd probably pick up 20 RWHP over that carb without reducing streetability (as street driving is usually done on the primaries anyways).
