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  1. 6

    V-P 5.7 Gxi intake on 383 stroker?

    My old racing buddy found this guy in Herndon, VA.\: https://www.maicsalazardiagnostics.com/ Anybody know anything about him? re: fitting BBC 8.1: assume there are adapters where needed to attach motor mounts and exhaust y-pipe. Can you use the sbc coupler and transom assembly? How about fuel...
  2. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Back in the day we tuned race engines using exhaust gas temperature gauges and set up the MSD with a little retard at the top end. Never burned a piston, and if a rod let go it was at the big end from too many revs. Any way to get EGT reading from a marine exhaust stream? btw, I've had lots of...
  3. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Yes, I know all about V-P systematic issues. Missed the 2023 season finding a mechanic who would take on the overheating issue on the 290 Chap with 5.0's; didn't get back on the water until late '24. Since the admiral is no longer here [accident, not her fault], I don't need a cruiser and could...
  4. 6

    V-P 5.7 Gxi intake on 383 stroker?

    As luck would have it, Gxi-G is the first V-P offering that doesn't use the 555 engine management system. Per Bob: "We do not deal with that E-controls Volvo EGC ecm at all, so I can not help you. See: http://mefiburn.com/ecmrepair.asp" A look at that link shows that all V-P's up through...
  5. 6

    V-P 5.7 Gxi intake on 383 stroker?

    aka Bob Madera?
  6. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Reached out to Michigan Motorz. Here is part of their reply: "At this time, we do not offer a 6.2L Volvo replacement." Near as I can tell, V-P never offered the 6.2 - at least in the years around 2005-6, which is when this Chap was built. Anyone know of an online resource that could help with...
  7. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Thank you.
  8. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Mercruiser has made a 383 that comes complete with intake and ignition; this is the one with the flame graphics on the spark arrester [!]. There are reman versions of this engine for sale out there. Anyone know of a successful mating of this engine to a V-P leg and electronics? The 555...
  9. 6

    V-P 5.7 Gxi intake on 383 stroker?

    We bought a 265Ssi new at Centerville Waterway in VA. V-P 8.1/375. After break-in she hit 56 statute mph on the gps both ways running the canal there. Real-world cruise at 2900 rpm [the sweet spot, to my ears] returned a shade over 3 mpg. She would pop up two adult slalom skiers with ease, with...
  10. 6

    V-P 5.7 Gxi intake on 383 stroker?

    The tow vehicle for our first Chaparral had a 6.0 LQ4 that made amazing power and would sustain 5000 rpm for as long as you asked it. LQ/S swap is probably beyond my abilities and budget, though. Trying to keep things simple by staying within the same general engine family as the 5.7 GXI...
  11. 6

    V-P 5.7 Gxi intake on 383 stroker?

    Yeah, but I seem to recall reading somewhere that the ECM can be reprogrammed to work with the stroker. I'm not too keen on buying a new engine when there are already doubts that it can do the job. Guessing that the 350 is a bit less than ideal since you were looking into this same upgrade...
  12. 6

    5.0 OSi-JF overheating at speed

    Just to finish off this thread: the problem turned out to be a failed plastic nipple attached to the hose in the junction between outdrive and transom assembly. It's #9 in the enclosed diagram. Since the failed part was underwater before the boat came up on plane, the problem never really became...
  13. 6

    V-P 5.7 Gxi intake on 383 stroker?

    My marina just inherited a Chaparral 265Ssi with a trashed V-P 5.7 GXI-G over 1.95 DP with F4 props. I am interested in buying this boat, since we previously owned the same model with V-P 8.1. Real world weight estimated at 5600#. I feel that the regular 5.7 would be underpowered when skiing or...
  14. 6

    5.0 OSi-JF overheating at speed

    Yes, your boat has much better access as well as lighter components. Mine has a deck above, batteries and black water tank on the outsides, and the other engine on the inside. Very tight even with a 10' beam. I still have an old coffee can full of Datsun L-series head bolts left over from...
  15. 6

    5.0 OSi-JF overheating at speed

    No report from the Manatee off Highland Shores?
  16. 6

    5.0 OSi-JF overheating at speed

    alldodge wrote: No need to hold all the weight just to get the bolts in. Just like when installing cylinder heads; done that many a time. But never having done boat manifolds, I wanted someone more qualified on the job, too. The first guy who said he'd work on gas motors declined because of age...
  17. 6

    5.0 OSi-JF overheating at speed

    One more trip to the boat and took along a friend with a lot of i/o experience - just not with V-P's. We started the engine and put it in gear at idle while tied up at the dock. After about 10 minutes we began reading high temps off the dash gauges and with the infrared pyrometer. At this point...
  18. 6

    5.0 OSi-JF overheating at speed

    Got some clear tubing and measured raw water pump flow at idle. Starboard [the problem engine] was only a tad bit slower than port. No bubbles. Checked flow in hose from exchanger to an exhaust manifold; almost as fast as direct pump output. Conclusion: it's got to be elbows, risers, manifolds...
  19. 6

    5.0 OSi-JF overheating at speed

    Don't know how many seasons in salt/brackish. We bought the boat on a tip from the dealer where we had bought our previous Chaparral - also with V-P power. We had them do a compression test, and bought the boat based on those numbers [175 +/- 5] and the very nice condition of upholstery and...
  20. 6

    5.0 OSi-JF overheating at speed

    Thanks for the tips. Planning to do a variation of the first suggested one: remove upper connection of raw water pump outlet hose, reroute it to a 5-gallon bucket and run engine while timing 20 seconds or so. Repeat with other engine, again measuring what collects in the bucket. Finally, pull...
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