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  1. Bextreme04

    Gen 4 bypass valve plug

    They never hold at 55. Especially when they heat up. At a minimum that should have the deflector on it though. You will have that valve only if the engine was equipped with AFM/DOD or VVT. The L9H I got to replace my LC9 was a non-DOD 6.2 with VVT and it had the valve without deflector(came out...
  2. Bextreme04

    Overheating Rebuilt 350

    Yes, same instructions. The problem with the edelbrock will be that a factory fuel pump is likely too much fuel pressure for it, so it will be pushing fuel past the needle and seat. They are also often set with way too rich of a jet from the factory. You would need a wideband to know just how...
  3. Bextreme04

    Overheating Rebuilt 350

    What carb is it? If it is the original quadrajet it is pretty simple. You would just get it nice and warm, then disconnect the vaccum advance to the distributor and plug the port on the carb side. Then, with the engine shut off, screw both idle mixture screws clockwise until they gently bottom...
  4. Bextreme04

    Overheating Rebuilt 350

    Now that initial cam break in is done, go through and adjust idle speed and idle mixture. That might help a lot as well.
  5. Bextreme04

    Overheating Rebuilt 350

    4 degrees ATDC is wild. That will not help at all in most cases. Try moving timing to 4-10 degrees BTDC and it might help a lot.
  6. Bextreme04

    Overheating Rebuilt 350

    Rust also has a good point. Now is the time to check idle mixture and timing. If you are too rich or too lean it will overheat. If you have too much or too little base timing it can also overheat.
  7. Bextreme04

    Overheating Rebuilt 350

    230 isn't bad and yes, running just straight water at idle can be a problem. Water will boil at 212 degrees at sea level and atmospheric pressure. Every 500ft of elevation above that drops the boiling point of water by 1 degree. Allowing the system to pressurize to the standard 12-16PSI of most...
  8. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    The iron heads that would have come off it are very good heads, but they will be rectangular port heads and not great at low RPM. I would still run them if you can get them. The big block cam will be very recognizable compared to an LS one. Look for the stepped nose, stock timing setup would...
  9. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    It's also worth noting that a Gen VII BBC cam will also work just fine, but would change the firing order to an LS firing order. It would also use the factory roller setup with a cam retaining plate. Also, I'm pretty sure any BBC timing gear will work with or without the factory stepped nose...
  10. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    No. All of your stuff just needs to match. If he had a factory style hydraulic roller cam installed already, he could just keep that. If he has no cam installed... it is just like you were putting any cam into any engine. The only difference between the Gen VI and Mark IV is that the Gen VI has...
  11. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    You shouldn't need anything to run a flat tappet. The Gen VI just has the machined boss on the front to run the cam retaining plate and it has the tops of the lifter bores flattened for the dog bones. There should also be the three threaded bosses for the spider retainer in the lifter valley...
  12. Bextreme04

    Overheating Rebuilt 350

    When I have broken them in on a stand.... no fan, no thermostat, radiator hooked up, output from intake to heater dumping on ground, inlet from heater to water pump connected to garden hose turned on all the way. I usually put a big box fan I have in my shop right in front of the radiator as...
  13. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    The Marine 502's from the 90's-early 2000's would have almost all been based on Gen VI block architecture. That means one piece rear main seal, less bolts on the timing cover, roller cam provisions, no mechanical fuel pump boss, standard deck height. If it was a large boat that had a heavy duty...
  14. Bextreme04

    Installed new tachometer and put a 70s fuel gauge in 85 cluster and now truck won’t start any ideas?

    Tach in a square will have a separate harness with power/ground connections and a single wire that runs from signal on the tach to the tach output on the HEI. If this vehicle had a hacked together setup for the heavy duty combo tach cluster to work, it likely needs to have that harness made or...
  15. Bextreme04

    Marine 502 into 1984 GMC 2500 454

    Pics? Depends on what the "Marine 502" actually is. What the block casting number? Where did he get it from? Is it one piece or two piece main? Do you KNOW it is a tall deck engine? Most 502's would have been short deck, but many marine applications are tall deck. You can just measure from crank...
  16. Bextreme04

    Wiring harness pt3

    Is that an aftermarket harness or a modified stock harness? MAF and IAT are in between the throttle body and intake box on a factory LS. Depending on the year of the donor, it will have either separate 3 and 2 pin connectors or it will have a single 5 pin connector for a combined MAF/IAT sensor...
  17. Bextreme04

    4" lift for 1977 k10

    I have stock 5-leaf 1997 K2500 Suburban springs with a 2" shackle flip on the rear and Tuff Country 4" EZ-Ride HD springs on the front. I also got the ORD sway bar disconnect kit at the same time I put that on. The sway bar disconnect kit made a big difference just getting rid of the sway bar...
  18. Bextreme04

    Fuel tank replacement on 1987 LS swapped square body

    I removed both saddle tanks, replaced all rubber hose and both sending units and re-installed them all in about 2 hours. In a gravel driveway. I would put it on the lift and check everything out before deciding what to order. Tanks are easy to find and cheap. Sending units are not. The holley...
  19. Bextreme04

    Chuck’s engine build thread!

    Sounds like its good to go. I think part of the reason Plastigauge has fallen out of favor is because there is so much chinese fake stuff out there, or expired ancient stuff that you could get some very whacky results. I had an engine reading very strange readings with thew plastigauge. Tried...
  20. Bextreme04

    Oil Pressure Sending Unit Missing- Empty Threaded Hole

    yes and yes. It will depend on what year and type of engine you have in there. I believe it would be 1/8, but I would just pull the plug out and take it with me to the parts store.
  21. Bextreme04

    1983 c30 A/C Compressor Clutch

    Since you upgraded the compressor and have an all new system, I am even more convinced its electrical. Since you have the two pin plug on it now, I would take the original single power wire coming from the low pressure switch running to the compressor and use that to power a relay. Run the other...
  22. Bextreme04

    1983 c30 A/C Compressor Clutch

    I would still guess it is electrical though. What compressor do you have? R4 or A6?
  23. Bextreme04

    1983 c30 A/C Compressor Clutch

    That's pretty low. What was the high side pressure at? You replaced the orifice tube when you did the conversion? My high pressure port is AFTER the condenser. If yours is also, you could have a clogged condenser causing this and it wouldn't show up on the gauge. Mine reads well under the max...
  24. Bextreme04

    1983 c30 A/C Compressor Clutch

    That's not how that works. You could have twice the acceptable charge for your system and still have it reading 45PSI. You filled it while running and AC on... right? I will usually pull a vacuum for 45-60 minutes, then check for leaks, then let it suck in most of a 12oz can, then start the...
  25. Bextreme04

    1983 c30 A/C Compressor Clutch

    Unplug the clutch plug and test voltage across the two pins while it should be engaged. Then check voltage(voltage drop) from the ground side of the clutch connector to the battery negative and the same from the positive clutch pin to the battery positive. You should have 12.4+ between the two...

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