Post by joker14 on Aug 10, 2011 18:36:41 GMT -5
Tips when tuning and running LS engines with a carb.
1. NO PLATINUM SPARK PLUGS, if you dont heed this warning your find out the hard way. Those plugs dont do well with the terrible fuel air mixes you throw at them.
2. Do spend time on initial start adjusting the idle mix screws, they are 20x more sensitive than small blocks especially with a 4bbl. it usually takes me 20 mins to tune mine right or you get terrible idle quailty.
3. Let them some time to get used to the ign box. It will run bad at first but after a few mins it ill learn a lot about the engine.
4. remove the thermostat and make sure you install a block off plate inside between the incomming and outgoing water passages. Not doing this will not circulate water but just run it in a circle and not push anything into the block or the radiator.
5. Make a custom lower water neck, the one that returns the water into the radiator. the angles are terrible to package up.
6. Make sure you always keep spare MAP sensors with you. If you run into bad idle problems, its usually cause you had a backfire and killed the MAP sensor and thinks your at 1/2 throttle and throws the timing to it and runs bad. They are cheap and usually get them off junk yard motors. With the programable stuff where you can see the live data make sure you bring your labtop along and if it runs rough go in and look at the live data on the MAP and if its stuck at 15v its usually been backfired and now junk. When this happens it runs fine just idles bad. Wont take you out of a derby but something youll have to deal with.
7. 15-50 Mobil 1 synthetic oil only, if not you'll find out on your own especially if you have a higher mileage motor.
8. When using DEC headers make sure you get the round coil set up, not the square ones. Again, if not youll findout the hard way.
9. tap and pipe plug the heater core outlet and inlets. If not use one as your engine temp. the holes are already drilled to size, just tap them.
10. 6.0's run great with a LS1 cam and LS1 heads.
11. Only use 93 octane, even with the stock stuff, again if you dont you find out why i tell you so.
12. the 4 corner water plugs need just that, plugged off. Find them on other core engines. most have them in the back and the tube for the throttle body which play no role in cooling so save the time and remember you are no engineer thinking your coming up with a solution to better cooling.
13. Have been having problems with the intake gaskets. They are ripping and sucking them in. I noticed the idle kept getting higher and higher ithout adjustment. With brake clean i sprayed very close to the gasket area and found the gaskets sucked in in a few places. They are replaced with 2000 Corvette intake gaskets. These still did not fix the problem. I then just resorted to the Felpro conventional paper ones and the problem is gone. No o-ring style gaskets or youll be sorry. Melted pistons 2 times now.
14. Buy the $40 converter adapter for the crankshaft, slot the holes in the flexplate for the converter for $0 and hold that b!tch to the floor till the bottom blows out of it!
1. NO PLATINUM SPARK PLUGS, if you dont heed this warning your find out the hard way. Those plugs dont do well with the terrible fuel air mixes you throw at them.
2. Do spend time on initial start adjusting the idle mix screws, they are 20x more sensitive than small blocks especially with a 4bbl. it usually takes me 20 mins to tune mine right or you get terrible idle quailty.
3. Let them some time to get used to the ign box. It will run bad at first but after a few mins it ill learn a lot about the engine.
4. remove the thermostat and make sure you install a block off plate inside between the incomming and outgoing water passages. Not doing this will not circulate water but just run it in a circle and not push anything into the block or the radiator.
5. Make a custom lower water neck, the one that returns the water into the radiator. the angles are terrible to package up.
6. Make sure you always keep spare MAP sensors with you. If you run into bad idle problems, its usually cause you had a backfire and killed the MAP sensor and thinks your at 1/2 throttle and throws the timing to it and runs bad. They are cheap and usually get them off junk yard motors. With the programable stuff where you can see the live data make sure you bring your labtop along and if it runs rough go in and look at the live data on the MAP and if its stuck at 15v its usually been backfired and now junk. When this happens it runs fine just idles bad. Wont take you out of a derby but something youll have to deal with.
7. 15-50 Mobil 1 synthetic oil only, if not you'll find out on your own especially if you have a higher mileage motor.
8. When using DEC headers make sure you get the round coil set up, not the square ones. Again, if not youll findout the hard way.
9. tap and pipe plug the heater core outlet and inlets. If not use one as your engine temp. the holes are already drilled to size, just tap them.
10. 6.0's run great with a LS1 cam and LS1 heads.
11. Only use 93 octane, even with the stock stuff, again if you dont you find out why i tell you so.
12. the 4 corner water plugs need just that, plugged off. Find them on other core engines. most have them in the back and the tube for the throttle body which play no role in cooling so save the time and remember you are no engineer thinking your coming up with a solution to better cooling.
13. Have been having problems with the intake gaskets. They are ripping and sucking them in. I noticed the idle kept getting higher and higher ithout adjustment. With brake clean i sprayed very close to the gasket area and found the gaskets sucked in in a few places. They are replaced with 2000 Corvette intake gaskets. These still did not fix the problem. I then just resorted to the Felpro conventional paper ones and the problem is gone. No o-ring style gaskets or youll be sorry. Melted pistons 2 times now.
14. Buy the $40 converter adapter for the crankshaft, slot the holes in the flexplate for the converter for $0 and hold that b!tch to the floor till the bottom blows out of it!