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  1. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    what´s wrong with GM parts for valve train? Why not getting their 1:6 roller tip rockers? I was adviced to look out for self aligning roller rockers. The ones MM puts on their GXi Block are these and they align themselves: https://www.summitracing.com/parts/cca-1418-16/make/chevrolet#overview
  2. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    good advice, thanks! Is there any chance we figure out, what is the GM part number for the roller rockers that VP used on the GXi?
  3. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    Then the Reluctor ring for the injected Vortec Engines seems to be this one: https://www.gmpartsdirect.com/oem-parts/gm-ring-10190917 ACDelco used the GM part number 10190917.
  4. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    But it says that it was used in the model years 1996 - 2002, while the GXI-E is from 2008. So I´d just prefer confirmation, that VP still used the old style.
  5. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    That is understood. This is the change on the heads you recommended earlier. Now it all makes sense to me. I’ll ask the if they can cut the valve stem down a bit. No reluctor ring. The block is from the GS what is a carbed engine. I can cut open the hole in the cover for the sensor, but it...
  6. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    What does that mean? yo no comprendo. Regarding the parts, I didn´t explain that correctly: I know how to look up the Volvo Penta parts. I find them just too expensive and would rather purchase them branded GM in a GM box. For example the crankshaft position sensor reluctor ring (Volvo Part no...
  7. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    I´m confused. I think I started a new topic, that is gone now. But instead it is still here. That is odd. Thanks fpr your hint, but how do I look up a Volvo Penta part number? I assume these are just GM parts in a different box and tripled price. Summit pointed out these arms COMP Cams 1418-16...
  8. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    you´re right, not all problems go away by running away. But at least some. ;-) I´ve started a new topic, since it would be too far off this title. And of course it includes also a rocker arm ratios/lift question. Since VP decided it would be too much stress crank out more power of their 5.7...
  9. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    It seems to be quite difficult (expensive) to get a replacement for a 5.7 GXi. Volvo asks for 7k, MM wants 5.600 (plus shipping to Europe plus tax is the same as volvo). I have a salvage block from a 5.7 GS PBYC. The only difference I can spot so far is the roller rocker arms in the GXI...
  10. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    Long time has passed, still not having repowered my boat properly, I learned some things: - carburated technology might be simple and easy to fix, but I just don´t understand enough to make it work for me. I just don´t understand any unpredicted behaviour and I can´t fix it. I am to slow to...
  11. bollerwagon

    Wiring diagram for 5.7 GSi PEFS? Or AQ271C? Ideally both?

    This is off topic: All the topics I start here sadly die soon. Originally I intended to repair my AQ271C, but not understanding carburated engines at all, I gave this up. So I bought a GSI engine! But it was so shitty that my mechanic told me to bring it back. Now I´m trying to build a GXi, I...
  12. bollerwagon

    Wiring diagram for 5.7 GSi PEFS? Or AQ271C? Ideally both?

    Thanks a lot guys! I asked Volvo Penta and look what they sent me! This is something I can work with, I guess...
  13. bollerwagon

    Wiring diagram for 5.7 GSi PEFS? Or AQ271C? Ideally both?

    I´ve dropped my rebuild plans for now and purchased a used TBI engine, knowing this will be another fine mess. One of the challenges is to map the old edgy plug from the AQ271C to the round one of the GSi (model 2000). Also there seem to be more loose plugs on the GSi then I have on the old carb...
  14. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    I was educated that until somewhat in the 90s HP was measured at the crank and since then at the propeller. That would explain why the 30 something horsepower advantage of the Vortec got lost on the way from Aq271c to 5.7 GS
  15. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    So you would NOT use the 5.7 GS Cam and lifters I have?
  16. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    Makes total sense. I do neither know the torque curve of the AQ271c nor the 5.7 GS. But instead of using the GS cam might it be more beneficial to use another cam, e.g. one from a 5.7 GXI?
  17. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    There is one thing that just strikes me when thinking about it: the stock AQ271C has 275 HP (not sure what torque) with the old heads. The vortec head equipped 5.7 GS has just 270HP. What component "reduces" power on the GS model?
  18. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    i think there are only drilled holes for the two bolt: let’s hope everything is prepared to mount the roller cam and stuff without surprises. How about the roller rocker arms? Makes sense? Edit: internet says, boat rpm does not need roller arms. Would you agree? So i use the old stuff?
  19. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    …it couldn’t be more specific… ;-)
  20. bollerwagon

    What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

    That’s odd. I’m relatively sure it is genuine Volvo Penta AQ271C and block is original. Is 14093638 a valid block number?
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