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  1. #1
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default "Well the original problem was

    "Well the original problem was running too hot 180-190 after warm-up of 160 slow increase.thought it was a water pocket in alpha 1 ,thought it was t stat housing,thought it was engine water pump.Did a compression test 2-4-6- pumped up to 140 decreased to 80-70 in less than 10 seconds,1-3-5- 120 120 135 held o.k. but not great compression.Today took it apart (6 hrs.)found 2-4-6- egg shaped head gasket 1-3-5- slight egg shaped.what was weird...no sign of water intrusion,no water in oil,no steam comming out of exhaust,plugs were black soot and light brown.Intake gasket no water intrusion.The thing is I did this same job 3 years ago.. Any Thoughts on how to proceed to re asemble."
    "When will you end"... the reply "When I'm finished"

  2. #2
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,396

    Default "... I did this same job 3

    "... I did this same job 3 years ago."

    Put a straight edge on the heads and block mating surfaces; they may need milling to true them. If the surfaces are warped then look into a reman. longblock unless you can do the necessary work.
    Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.

  3. #3
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default I was going to drop the heads

    I was going to drop the heads off at the machine shop to check psi and warping.the gaskets that were used 3 yr's ago were FELPRO I have heard some bad reports about them not holding up.This time I bought sierra.
    "When will you end"... the reply "When I'm finished"

  4. #4
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,147

    Default "[b]"the gaskets that were

    ""the gaskets that were used 3 yr's ago were FELPRO I have heard some bad reports about them not holding up.This time I bought sierra."

    Ayuh,... IMHOpinion,... You're going Backwards...
    Fel-Pro gaskets are about the Best out there...."
    Any Grease is Better,... Than No grease at All....

  5. #5
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default Incase you are not aware head

    Incase you are not aware head gaskets around the cylinders are not round. They do have a slight out of round shape.
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  6. #6
    Join Date
    May 2007
    Location
    Kawarthas
    Posts
    3,224

    Default "[b][i]was running too hot 180

    "was running too hot 180-190 after warm-up of 160 slow increase

    that's not critically hot imo, gauges aren't that accurate
    but you should change the impeller in the drive, not the w/p on the engine...

    thought it was a water pocket

    a what?

    140/135/120/120 sounds ok to me - certainly no evidence of failed head gasket with those numbers.
    I'd just set the valves

    I don't think it necessarily needed to come apart.

    maybe

    maybe the block deck is warped if head gaskets did have a repeat failure

    "
    Factory Manual Best, Seloc 2nd best, Clymer if you're desperate.

  7. #7
    Join Date
    May 2007
    Location
    Kawarthas
    Posts
    3,224

    Default "note shape- new head gasket:

    Factory Manual Best, Seloc 2nd best, Clymer if you're desperate.

  8. #8
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default The head gaskets that were rem

    The head gaskets that were removed were 1/4" out of round with water marks on the heads underneath the gaskets.Second responce...the readings were #1-#3-#5 135-120-120 and #2- #4 -#6 cyl 140psi down to 80-70 within 10 seconds with a compression tester.In other words cyl.2-4-6- loss pressure after 10 seconds.Which is one result caused by a BLOWN HEAD GASKET.I have pics but I keep getting an error of too large of a file.
    "When will you end"... the reply "When I'm finished"

  9. #9
    Join Date
    May 2007
    Location
    Kawarthas
    Posts
    3,224

    Default 4.3 head gaskets are at least

    4.3 head gaskets are at least a 1/4" out of round brand new
    Factory Manual Best, Seloc 2nd best, Clymer if you're desperate.

  10. #10
    Join Date
    Mar 2009
    Location
    Lowell, MA
    Posts
    1,217

    Default "You can use MSPAINT to resize

    "You can use MSPAINT to resize the pictures, or Picasa I think, which is free from google.com plus others from download.com (safe)"

  11. #11
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default Got the heads back fron the ma

    Got the heads back fron the machine shop.they are warped and a slight crack.machine shops advice is buy new heads.My question now is do I have to have the same casting number heads to match up with the block? or is it that both heads have to match and the block doesn't matter as long as the manifold fits
    "When will you end"... the reply "When I'm finished"

  12. #12
    Join Date
    May 2007
    Location
    Kawarthas
    Posts
    3,224

    Default "check the block too. I wou

    "check the block too.

    I would look for the same casting numbers. Full size pickup , full size van or Astro van same year as your boat should have the same heads.

    there are some rebuilders on the web that could confirm for you by casting #."
    Factory Manual Best, Seloc 2nd best, Clymer if you're desperate.

  13. #13
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default What year is the boat motor???

    What year is the boat motor???

    Do some reaserch for remanufactured 4.3 ltr heads from a local shop.

    I believe that the early 4.3 was uncounterbalanced and the newer 4.3 vortec is counter balanced.

    Thus if you have a newer 4.3 vortec block then ANY head of that vintage will work.

    There is NO specific difference between Auto vs Marine other than misc plugs and fittings that can be transfered from your heads.

    Guy is more of a 4.3 "guru"

    Maybe he will chime in with some specifics...

    Again buy local if possible.
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  14. #14
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default The engine is a 4.3 1995 v6 ca

    The engine is a 4.3 1995 v6 casting numbers #10238181 12 bolt manifold the plastic valve covers say vortec but I think it is a pre vortec.I have heard the chevy c-10 truck has the same parts.don't know for sure.Hopefully Guy will help...
    "When will you end"... the reply "When I'm finished"

  15. #15
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default 1995 is a vortec in my opinion

    1995 is a vortec in my opinion......

    If it say that then I would believe it.
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  16. #16
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
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    4,793

    Default Jim Look at the heads Th

    Jim

    Look at the heads

    There should be some casting numbers on them

    Please post the numbers....All or any of them
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  17. #17
    Join Date
    Mar 2009
    Location
    Lowell, MA
    Posts
    1,217

    Default "[b]4.3 1995 v6 casting number

    "4.3 1995 v6 casting numbers #10238181 12 bolt
    8:35am, Jim did note the casting numbers, they are Pre-Vortec, Vortec Heads have 8 Bolts on the intake and Flow 10% more."

  18. #18
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default "Jim It says you live on th

    "Jim

    It says you live on the Cape, There are many marina's where you should look for a set of rebiult heads or ask where you may find some.

    Brian, thanks. Not into casting numbers and bolt quantity or much else with the V6's...........LOL

    Worked on many but not major engine service......"
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  19. #19
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default "Been looking for website with

    "Been looking for website with rebuilt heads and they all are asking for a

    THREE (3) digit casting number.

    So Jim is there and if so what is it, a 3 digit casting number???

    example, #768, 996, 107, 476......"
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  20. #20
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default The only other numbers are b06

    The only other numbers are b065 and b145 I think they use the last 3 numbers of the GM number #10238181 so 181 would be my guess.
    "When will you end"... the reply "When I'm finished"

  21. #21
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,396

    Default Kghost: Thanks for the vote

    Kghost:

    Thanks for the vote of confidence but I'm not that astute on internal engine works. I will say that since it is not a Vortec engine and the engine is more than 15 years old; replace it w/a Lblock Vortec engine.

    My reasons are the heads have to be replaced due to warpage and cracks which is what I thought was the problem. The block assy. has had a hard life and should be reman. by a machine shop. There are to many unknowns about the block that could tie up $$$ in labor costs and parts. Why caress a mare when when a filly is available. Go w/a Vortec longblock; you'll be very satisfied w/the improvement.
    Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.

  22. #22
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default "Guy you are absolutely right.

    "Guy you are absolutely right.I'am weighing those options now, but time,money,and the desire to tinker and do it the easier way come into play.

    IF I COULD ONLY GET A COUPLE MORE YEARS OUT OF IT...IF I HAD THE ARMY I COULD TAKE OVER THE WORLD LOL....}"
    "When will you end"... the reply "When I'm finished"

  23. #23
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,396

    Default Get a reman. Vortec block and

    Get a reman. Vortec block and a set of reman. heads. Or look for a good used Vortec engine that was removed for a repower. They can cost around $500. Watch eBay for marinas selling them. Usually they garauntee them from what I remember.
    Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.

  24. #24
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default "Jim There is a marine rema

    "Jim

    There is a marine remanufacturer distributor near milford mass, Holliston mass. I have used then before. The motors are remanufactured in Rhode Island and I believe they do it for most all resellers locally.

    Here is the link.

    A complete long block. Been there done that and it is the easiest way to deal with this.

    http://www.1800runsnew.com/NLM/remanufactured-NLM.html"
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  25. #25
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default "One thing is, do you have a e

    "One thing is, do you have a electric fuel pump?

    If not then you will if you upgrade to a newer/vortec as they do not have mechanical fuel pump.

    Also if you buy a vortec you will need a new intake manifold and maybe other parts.....

    I do not know all the differences.

    Get your engine part number (merc number) and write it down if you call them and they will get you what you need."
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  26. #26
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default yes electric fuel pump.I looke

    yes electric fuel pump.I looked at this sight already $1900 plus. There is also Doug Russels in worcester with I think free delivery in mass. they are all about $1800-2200.longblocks.There is a place in RI.centerstateengines.com which is close.If I go that way I'm looking to pick up or free delivery it cuts out the 295.00 shipping cost's
    "When will you end"... the reply "When I'm finished"

  27. #27
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default "My opinion, Stay away from

    "My opinion,

    Stay away from Doug Russels.............."
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  28. #28
    Join Date
    Jul 2008
    Location
    Northboro, Ma, USA
    Posts
    4,793

    Default That web site I posted also se

    That web site I posted also sells remanufactured heads for your block. # 181 was a choice and they show $399.

    I am not sure if it is the price for one or both heads.......

    If it is $399 for each head ($800 for both) it would be much better to spend the extra $1200 for a fresh motor complete long block.

    If you got a pick up or access to one you can just go and pick it up yourself.
    Jack
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  29. #29
    Join Date
    Aug 2009
    Location
    Wortham, TX, U.S.A.
    Posts
    16

    Default "Jm, here is another site that

    "Jm, here is another site that offers remanufactured marine engines with a 7yr warranty, with very good prices as well.

    http://usengine.us/marine.html"

  30. #30
    Join Date
    Oct 2008
    Location
    CAPE COD, MA , USA
    Posts
    190

    Default I just got lucky on e-bay. A c

    I just got lucky on e-bay. A company in Clearwater fla. has a special on reman chevy heads 125.00 ea. with 25.00 shipping ea.the e-bay auction number is 370227232943.same casting number as mine #10238181.if brian beckett is out there can you take a look for me?
    "When will you end"... the reply "When I'm finished"

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