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  1. Tail_Gunner

    got a question about a future V6 to V8 repower...

    Ahh 100 ft lbs, much more than I thought, actually is that not 7.4 territory?. Which brings up the question, can the drive run that much tourqe?
  2. Tail_Gunner

    got a question about a future V6 to V8 repower...

    "I had used both a 15x17 and a 15.5x15 with the V6 to lessen the strain on the V6" Based off that and your boat I doubt very much if you could swing a 21 on the setup. There is just not that tourqe difference between a 4.3/5.7 At the end of the day it's tourqe that swings props, and you have...
  3. Tail_Gunner

    got a question about a future V6 to V8 repower...

    What's type of boat? Actually length width and weight? Don't get caught up in diameter to much....at least ive never let that mean anything This much I can tell you having a boat that pulls like a tractor (two cycle) from 30 to 50 is really a long term grin earner. Running at WOT not so...
  4. Tail_Gunner

    DIY Head Porting?

    Well since you that far along...add a xm 270 cam....debur the heads and spin that up to 6000 rpm. Your outdrive is quite robust, I don't think 6k is to unreasonable...you won't know if you don't get. Lol. Ohh I see that's been done.
  5. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    The answer would be yes, running smoothly in neutral under "no load" that is. Under a load no, as you have identified. Under a load cylinder pressure goes up..that piston does not travel so freely. It's very similar to ignition timing, adding to much advance and the engine is in neutral not...
  6. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    These valves, did you push them down and release them a few times? Have you rechecked your comprehension? If the valves are closing and your still running 50 psi, you may as well pull the motor. That is a big hole in the chamber, huge hole. But hey maybe a gasket leak can be that bad. Now that...
  7. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    Have you pulled your heads off? Are these valves still stuck? Are you searching for water intrusion? I see you have a tbi, they we're once known as a slobber body. Meaning fuel was just dumped into the engine. If your engine was not run hard often it more than probably all carboned up. Can...
  8. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    Valve lash in the 21st century. Somethings never change. I grew up in a GM garage, I can openly state two very accomplished mechanics do things there each individual way. Trying to get them on the same page can be a journey all into itself. Actually ive seen it here on I-boats. Long ago...
  9. Tail_Gunner

    John Allmand - SuperNova19 video restore

    You have quite a project going on there, kudos are in order well done.
  10. Tail_Gunner

    Vapor lock

    What type of symptoms is this engine experiencing? Gas boils at approximately 160 degrees Fahrenheit, marine blocks simply do not run as hot as a automotive block.
  11. Tail_Gunner

    Marine Power 454 Engines Fuel Pump

    Agreed on the mechanical fuel pumps, simple reliable and less expensive. Made to order for a Rochester carb. A home made pressurized fuel system is a accident in the making. Below is a review from Summit, making a call to tech support to verify the issue would be prudent. Original Pump lasted...
  12. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    Don't over think this, what has happened is over its done. Alldodge is quite correct in his assumptions head gaskets a highly suspect just as valves are. You stated this engine was a hard start when hot, that is not a good thing. The first thing that comes to mind is the timing chain did...
  13. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    https://itstillruns.com/stuck-exhaust-valve-7876001.html Personally I like a 1x1 block of wood and a 2lb hammer. Heavy taps and never allow the hammer to tap anything that is metal... If your somewhat lucky they will break loose. But first pull the pushrods and check for any distortions...If...
  14. Tail_Gunner

    Mercruiser ECM replacement?

    Finally found the seperate knock module. Look closely at that part, do you have it mounted on your engine near the ECU. Based upon that engine switch over you cannot assume anything. https://www.nlamarine.com/products/mercruiser-806611t-knock-control-module-5-0l-5-7l-350-305-alpha-bravo In...
  15. Tail_Gunner

    Mercruiser ECM replacement?

    This new distributor, do you have the make and model number. As to the engine serial number, let's focus on the head design. Underneath the valve covers there are casting numbers, they will identify your engines needs. Your current setup may well work, it just needs to be setup correctly...
  16. Tail_Gunner

    Intake port cc question for 5.7l sbc

    As Mr Danforth says. Running a marine motor above 5/5500 rpm gets very expensive. But you seem to shooting for more HP one would assume. Carbed engine I assume?
  17. Tail_Gunner

    Mercruiser ECM replacement?

    It appears so, Bup lays it out quite clearly. Or maybe I have had one to many knocks myself...Quite possible do not remember the timing curve for this engine and I'm almost 100 % it is not listed in the service repair manual. I have the manuals for this but not in front me to 100% verify that...
  18. Tail_Gunner

    Mercruiser ECM replacement?

    Achris in regards to Mefi 1, did merc use a knock module, not to be confused with a sensor. https://www.manualslib.com/manual/1201866/Mercruiser-305-Cid-5-0l.html?page=550
  19. Tail_Gunner

    2006 Volvo 5.7 osi-d crank no start

    Time to pull your valve cover and check for stuck vales...Exhaust vales are your primary suspect You have a roller cam it should take very little time. If your lucky they can be freed, check your pushrods while your there. Pushrods rolled on a piece of glass..say a mirror. If they wobble...
  20. Tail_Gunner

    Mercruiser 3.7L 190 Starter Motor Cannot be removed (Rusted in)

    As you have read pulling the motor maybe on the table So get some wood bleach, a hand held garden sprayer and soak the entire starter and block. This needs to be done at about 15 minutes intervals for a day. When your done rinse with a hose and you will find there will be little or no rust. It...
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