Out with the old and in with the New! 4.3 to 383
May 19, 2006 | 10:29 PM
#1
Thread Starter
12 Second Truck Club
Joined: Nov 2005
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From: Jackson, MS
Out with the old and in with the New! 4.3 to 383
Well you can see the 4.3 has left the building and left room for a nice shiney new 383 stroker motor
. It lacks a few things but all of the plumbing is almost done. Hopefully Sunday we can get it all buttoned up and start the break in. The scoop on the motor is 383 engine dyno 397 hp and 441 lbft torque. I coupled it with a build 700r4 (nelson temple is a local builder who did all of the upgrades) and I still have to install 4:10's and a detroit tru track in the rear. I don't think traction will be an issue for the breakin period but then I will need to do the rear end swap.Once it is running well I have a few locals I need to see!
May 19, 2006 | 11:37 PM
#2
Sweet.
I just swapped in a 383 to replace the spun 350. Even keeping it under 3500RPM and unboosted for the first 500 miles, it pulls way strong compared to the 5.7. Stepping up from a 4.3 to a 6.3 is going to feel real nice.
It is so hard to keep my foot out. This thing wants to go. One positive note about the break-in is using it to log data and get fuel dialed in for the Main Event.
Since you're riding out a break-in period, was another one identical used for the dyno numbers?
I want to hear the goods on the internals!
I just swapped in a 383 to replace the spun 350. Even keeping it under 3500RPM and unboosted for the first 500 miles, it pulls way strong compared to the 5.7. Stepping up from a 4.3 to a 6.3 is going to feel real nice.
It is so hard to keep my foot out. This thing wants to go. One positive note about the break-in is using it to log data and get fuel dialed in for the Main Event.
Since you're riding out a break-in period, was another one identical used for the dyno numbers?
I want to hear the goods on the internals!
May 19, 2006 | 11:51 PM
#3
Thread Starter
12 Second Truck Club
Joined: Nov 2005
Posts: 1,451
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From: Jackson, MS
If you will notice the carb sitting on top there want be any logging 
but there will be alot of relearning things like distributor weights and carb tuning 
When that motor was built it was run on an engine dyno 3 pulls after a brief breakin period. The internals are keith black pistons scat barring and an eagle rotating assembly. All of it was balanced at the machine shop before assembly. the carb is a 770 hollie the distributor is a MSD pro billet and a MSD digital 6 (hope to procharge in the future digital 6 has timing retard built in) Total compression is 9.5 to 1
but there will be alot of relearning things like distributor weights and carb tuning When that motor was built it was run on an engine dyno 3 pulls after a brief breakin period. The internals are keith black pistons scat barring and an eagle rotating assembly. All of it was balanced at the machine shop before assembly. the carb is a 770 hollie the distributor is a MSD pro billet and a MSD digital 6 (hope to procharge in the future digital 6 has timing retard built in) Total compression is 9.5 to 1
May 20, 2006 | 12:40 AM
#4
Ahh.. I see it now.
If it's made three pulls then it barely needs a few more heat cycles and the rings should be good and seated I'd think by now, if you have roller lifters in it.
Thinking about new rings on a dyno makes my head hurt a little. Hope it's good.
If it's made three pulls then it barely needs a few more heat cycles and the rings should be good and seated I'd think by now, if you have roller lifters in it.
Thinking about new rings on a dyno makes my head hurt a little. Hope it's good.
