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    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    This is really getting deep
  2. C

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    Info getting better all the time. Did GMC block casting numbers say GMC on them
  3. C

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

  4. C

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    Love that PDFs thanks a lot
  5. C

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    Thanks for all the great input. Outside of the motor mounts is there a difference between a 250 i6 Chevy motor for a car and a truck. What years would be a perfect fit for my 77 if I were looking for a replacement engine.
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    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    My block casting number is 366855 GM that refers to a Buick, Olds, Pontiac and Chevy I dont think that GMC made a 250 cid inline. If they did would the block say GMC on it.
  7. C

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    Can anyone tell me if these are two different engines or just a name mis-understanding? I was told buy the guy that i bought the boat from that it was a GMC engine. I like Chevy and Ford trucks but not any GMC stuff. When i was a kid in the 60's they sold Chevy trucks and GMC trucks they were...
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    Electronic conversion kit or a Delco Distributor or a module

    Can't beat that as soon as i figure out what i need ill buy from iboats
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    Electronic conversion kit or a Delco Distributor or a module

    Can I buy car parts instead of marine or this https://www.marineengine.com/newparts/part_details.php?pnum=MER34235Q+1 how do i know if i have a delco conventional ignition sys https://www.marineengine.com/newparts/part_details.php?pnum=MER33765T
  10. C

    Electronic conversion kit or a Delco Distributor or a module

    1977 6 cyl inline 250 cid 165 hp
  11. C

    Electronic conversion kit or a Delco Distributor or a module

    Hi All, Im confused on why we have so many options here. Which is best? Pertronix Ignitor II 91163A conversion kit new Delco distributor module box
  12. C

    which bilge pump do i need with a manual / auto switch

    The guy I bought it from said it was in his family for 36 yrs he did say he replaced the carpet but the floor is a little soft on both sides of the engine, but I'm 6' 4 and 255 lbs so that does not help. I really appreciate all the help I get from you guys. So if I want to test my new bilge pump...
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    which bilge pump do i need with a manual / auto switch

    Well i had my first bilge experience yesterday. My bilge is about 1 x 2 feet and located under the oil pan. My Rule Mate 500 could just barely make it out and the drain hose was very short. I have no idea where the wires and hose even lead to. I assume the wires go over to the battery and 2 goes...
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    which bilge pump do i need with a manual / auto switch

    If i buy a new Rule 41 bilge pump switch and the Rule 500 GPH Standard Bilge Pump Kit w/Float Switch 12V 25DA-35A and i put the switch on auto that will give the float switch control of the pump so i just need a non auto pump correct?
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    which bilge pump do i need with a manual / auto switch

    Great advice now that I'm going with a pump and float as two separate pieces what do you guys think of the Rule pumps
  16. C

    which bilge pump do i need with a manual / auto switch

    ok thanks so what do you guys think of the rule 500 gpm auto sensing
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    which bilge pump do i need with a manual / auto switch

    The Rule is not but i dont here the pump come on when i flip the switch on the console. I have the boat covered up and it is really cold here in va so when we get a nice day i will look into this more.
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    which bilge pump do i need with a manual / auto switch

    I made a mistake that is the one i want to buy this is what I have. Why do i have a pump switch on the console and this Rule on the left side?
  19. C

    which bilge pump do i need with a manual / auto switch

    Hi all, I have a bilge pump switch as seen below. Since i can switch it to auto does that mean i should just buy the Rule non auto? The auto model has a built in float switch is that better than having a separate float switch?
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    Mercrusier sterndrive ratio question

    Thanks for the great replies. Is it a 4.1L then
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