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  1. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    I tune for a living I understand how all that works and how to read a spark plug after a wot pull and hot shut down so that’s all good. If people stuck. That is part of getting the most from something. I have found 25whp in 2 degrees of timing on a typical stock Camaro or corvette with an lt1 in...
  2. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    Cool that’s good to know so thank you. So if I do a 350 hp ls 5.3 down the road I can go out to a 24 and be covered most likely.
  3. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    Ok so this prop seems very well made didn’t see anything I saw complained about in some older threads. It’s powder coated not painted so that’s nice and it rings like a forged materials not the dull thud of cast aluminum like the 3 blade does. So some nice quality there for a 100 dollar prop...
  4. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    Thanks for the input so my boat a little bigger heavier the 14 19p is probably gonna be ok. Comes in tomorrow so will test it out this weekend and will post results as I hate reading a post and not seeing an answer and it goes dead. So many times I find what I’m looking for then get to the end...
  5. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    So that’s a little bigger diameter but pitch down from what I ordered to try. Hustler 14 inch 19p I liked it’s not cast aluminum but pressure molded and they use two different style blades on same prop and it’s a vented hub for hole shot. I read good reviews on most people that tried them and...
  6. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    Great thank you. Just checked my lower oil and has some water in it. Not a lot but enough. Took apart water pump and blew out the lower gasket. Glad I’m going over everything on this boat. Hopefully he didn’t run it too long as the oil was newer and clean. Feel like knew had water and put oil...
  7. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    So seeing quicksilver has the spit fire 4 blade aluminum and nemesis also aluminum. Their are cheaper props as these are only 200 bucks with the hub. Not sure which will give better performance. Does yours have any stamp on it or part number? And very cool about the t/a I almost got a 1976 455...
  8. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    http://legacy.qsprops.com/prop-selector/?performanceGoal=1&highAltitude=1&altitude=1000#step5 Any of these sites worth a crap? I put in all the information and off the 1.81 drive ratio comes up with 8 3 and 4 blade props all at 21 pitch different sizes 13.88 to 14.25. It did recommend one 20...
  9. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    Well seems that my gen and year is using a 1.81/1.84 one or the other ratio gear drive so that’s gonna be off some and I’ll have to get a prop calculator. I was reading the 1.62 is from the v8 motors up to 2005. I bet with 230 hp mpi they gave that motor a little lower gear assuming that a 21 on...
  10. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    I’ll have to look up my ratio as it’s also alpha 1 I believe gen 2 I’ll pull the serial and double check it. Had you ran a 3 blade prior? If so what results? Aluminum or stainless 4 blade on boat now? I’m pretty sure I thought all of the mpi were 230 hp so that seems like a low spec for that...
  11. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    It had that 19 on it and was at 5k which might be a little much? But again it’s tore up so now idea how much slip I was seeing. Aren’t some brands better then others on design? The prop I had was a whopping 87 bucks I looked it up so seems very cheap. So assume there is a better line of prop...
  12. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    This is the original prop part number that’s bent up
  13. Lt1z350

    94 chaparral 1930 ss with 4.3 prop help

    So boat is 19.3 long 2500 lbs by the reading I have done. 4.3 190 hp from what I can come up with as has 4bbl on it. It’s that lx thundervolt. Just bought it and had a 19 pitch cheap Solaris prop 13.5 I believe I can get part number off it. Previous owner hit something and bent it up pretty...
  14. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    https://www.facebook.com/marketplace/item/1030893077787287/ How about a chap 1930ss? Yes the smaller 4.3 but I’m a car guy and know some tricks like 1.6 rocker arms new intake and carb to boost it 40/50 hp. Worst case a cam and heads swap if wasn’t enough engine. 250 hp isn’t too hard on a 4.3...
  15. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    Yea it’s beyond redicilous all around here on people gouging on prices. Look up nada and add 3k seems to be the going rate on anything. The bigger problem is people are paying this crap so it continues on. I tried to see if would put in water tomorrow and tried to dance around that at all...
  16. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    Yea then trusting that the actual 433 hours on the boat(sent picture) it was well taken care of. Seen a lot of drives need nothing but if can’t get something when need it what is the point. Too bad didn’t copy the Volvo so well the parts interchanged. Lol
  17. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    Well he is asking 8900 so if not sure that’s a good enough deal to do a 5k repower. He claims only 77 hours on it. Hour meter probably broke.
  18. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    I saw someone said the bravo drive is a direct swap but I’m not sure. A few say it’s a strong drive but if breaks screwed on parts. I guess depends how good this boat really is as posted and asked how the boat is vrs others from that age. Hard to find a decent boat interior and shell today that...
  19. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    I read a lot the Yamaha is hard to find anything but copied Volvo so a heavy duty unit. Boat is super clean garage kept from pictures I can’t find many flaws before go drive 3 hours to see it. I’m not sure what hp is in this model as nada shows can be a few 5.7 hp models available. Seems like...
  20. Lt1z350

    94 Cobia 5.7 Chevy/Yamaha setup

    Looking at this 94 Cobia 198e Monte Carlo which is super clean. I’m trying to find out what hp motor this might be and if 4 barrel setup. I did read the Yamaha out drive is extremely hard to find Parts but stole Volvo setup so it’s very strong and a good unit. But rather get some answers here...
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