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  1. bollerwagon

    Volvo Penta 855932 Prestolite 7801A advance springs

    Looking at the workshop manual I tend to think that there are different springs used: Although only 2° difference in idle, there is a bigger difference at higher RPM. E.g. : - 501B has 20° B.T.D.C at 2.000 RPM already, - 501A has 14° B.T.D.C at 2.500 RPM. Might be looking at it wrong, but...
  2. bollerwagon

    Volvo Penta 855932 Prestolite 7801A advance springs

    This should be the map for the AQ271C Distributor. Would be nice if someone could check his map and if compliant, measure the springs so they can be rebuilt
  3. bollerwagon

    Volvo Penta 855932 Prestolite 7801A advance springs

    3 years later, same problem again. But this time the bigger spring was a bit overstreched, for whatever reason. I´m thinking about asking someone to produce these as replacement. Is anyone out there who can confirm or correct these measurements? Small Tension Spring ( a bit more rusty than the...
  4. bollerwagon

    Piston Rings don´t fit, too little clearance, sits too tight

    All cylinder values were within tolerances, so we only replaced bearings. (The engine should not have been taken apart in the frst place, but back then I knew nothing and did how I was told.) Pistons also new because one skirt showed some wear and I could not find a better single replacement...
  5. bollerwagon

    Piston Rings don´t fit, too little clearance, sits too tight

    Yes, brand new set of piston rings that are supposed to work with these pistons.
  6. bollerwagon

    Piston Rings don´t fit, too little clearance, sits too tight

    The parts list shows two different types of pistons, depending on the block (Std S4 and Std S5). But the rings are the same, as it seems.
  7. bollerwagon

    Piston Rings don´t fit, too little clearance, sits too tight

    Thank you all so far, let me be more percise on the problem. It indeed is the Piston Ring Side Clearance. On the first attempt, when trying to fit the oil scraper rings on the 10046106 pistons, there indeed was back clearance issues. Since one piston was a bit worn and my workshop hat some new...
  8. bollerwagon

    Piston Rings don´t fit, too little clearance, sits too tight

    Reassembling my Volvo Penta AQ271C after honing, the piston rings I purchased (Sealed Power Performance Piston Ring Sets E251K) don´t seem to fit. The piston is a GM piston p/n 10046106, I assume there are the original ones. With this piston the oil scraper rings were too wide, the piston ring...
  9. bollerwagon

    What timing gear set for Vortec engine 350 block 880 / 5.7GXi?

    The difference seems to be the cam side: - flat tappet -> bigger diameter on holes of the cam sprocket - roller tappet -> smaller diameter Called Cloyes today, the guy gave me two options Cloyes Street True Roller Timing Sets 9-1157 Cloyes Original Race True Roller Timing Sets 9-3157 9-3157...
  10. bollerwagon

    What timing gear set for Vortec engine 350 block 880 / 5.7GXi?

    The diameter of the hole in the middle of the cam sprocket is smaller and the diameter where the holes for the screws are is also smaller on the Vortec cam sprocket. I also have a AQ271C (pre vortec) in parts here, there the CLO-C-3023X with the larger diameter fits well. Maybe Vortec and...
  11. bollerwagon

    What timing gear set for Vortec engine 350 block 880 / 5.7GXi?

    I see GM offers only one timing set: Single Roller Timing Chain Kit this is the same set that summit suggested with the part number 12371043. If this is indeed the stock truck part, then the mappung of the GM and the Volvo Penta part numbers would be like this chain GM part number 14088783 ->...
  12. bollerwagon

    What timing gear set for Vortec engine 350 block 880 / 5.7GXi?

    I understand and agree to your idea of "oversizing" things. This is why I purchased the double roller (that doesn´t fit). But since the engine ran well the first 30 years with the single and cheap stock part, I thought that would be fine for the next 30 years. The list you provided does also...
  13. bollerwagon

    What timing gear set for Vortec engine 350 block 880 / 5.7GXi?

    I would like to replace the timing gear on the Volvo Penta 5.7GXi I´m building. I am using a old GS engine block, but the part numbers of the parts seem to be identical: 3856114 cam shaft sprocket 3852685 chain 3852690 crank shaft sprocket On the cam sprocket I took off the GS it says 12552129...
  14. bollerwagon

    Stainless Steel Exhaust System for AQ271C (alternative to Hi-Tek / marinetorq)

    What I liked about the hi-Teks is that they have the brackets for alternator or fuel filter exactly matching the engine setup. Barr, Eddie marine or stainless marine don’t have this, I assume.
  15. bollerwagon

    Stainless Steel Exhaust System for AQ271C (alternative to Hi-Tek / marinetorq)

    I was absolutely in love with the australian exhaust system from Hi-Tek because of its look and the guarantee that never again the failing gasket will kill my engine. But I can´t manage to get one from them that fits, the HT-28 provided by them is too low, not matching with the Y-pipe from the...
  16. bollerwagon

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

    I have not changed seats, these are genuine in a ‘89 engine. I just replaced the valves. I don’t know for sure and I don’t have good pictures, but it looks if they were this way when I pulled them off. I’ve ordered the valves according to measurements from the old valves. Summit racing was not...
  17. bollerwagon

    Volvo Penta 855932 Prestolite 7801A advance springs

    I still need those springs, the rest of the distributor works fine. Do you happen to know a specific product number or something?
  18. bollerwagon

    Volvo Penta 855932 Prestolite 7801A advance springs

    these are not springs, or do I get that wrong?
  19. bollerwagon

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

    The heads from the AQ271C are being machined, they got new valves also. What´s confusing is that the exhaust valves are not really deap in their seat, they seem to stay right in the fire. I have no expertise here, it just feels wrong. Or at least not ideal. But I think it wasa pretty similar...
  20. bollerwagon

    Anyone sells a closed cooling kit for a V8 petrol MPI? Preferably Volvo Penta

    Wow, this is a profound elaboration. Thanks. The bypass on the HX cooled engine was new to me and what confused me. I assume it is part 17 in the attached picture? On the GXi-FF I have this setup. I have purchased a used but original HX for this engine, should I look out for the original...
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