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  • Pedlyr
    replied
    Mines on Stbd side. My records show this Mercruiser part number 15296A2. But I dont have the hockey puck on the end.

    https://www.nlamarine.com/products/m...31591745060961

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  • Quik Fix
    replied
    Port side dipstick.

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  • Pedlyr
    replied
    Originally posted by Quik Fix View Post
    Don't put the risers on before the valve covers. Can't get to one of the cover bolts. Now the dipstick won't wort.
    I went with the dipstick that swings out to the front of the engine

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  • Pedlyr
    replied
    Sizing of the heat exchanger is done by the heat rejection rating of the engine.If you want to double check, someone should be able to give you a figure for the engine in BTU's. You can then match it to the heat exchanger specks. Believe it or not in my experience the biggest issue here is a raw water pump that pumps too much. Doesnt let the water absorb the heat or something. We've actually have put washers in the overboard discharge pipe to restrict the flow. Doesnt sound like there will be an issue here.
    Last edited by Pedlyr; 03-26-2022, 07:26 PM.

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  • Quik Fix
    replied
    Don't put the risers on before the valve covers. Can't get to one of the cover bolts. Now the dipstick won't wort.

    Leave a comment:


  • tuner
    replied
    Sizing the heat exchanger is directly related to the HP and fuel burn rate. Increasing HP and fuel burn burn increases the heat energy (small fire/big fire), and subsequently, the area needed in the heat exchanger and water flow rate. I think a standard SBC/ 351W sized HE will work with a 383, especially with a half system.

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  • Quik Fix
    replied
    Thanks,I'm sticking with the stock for 351 HE. If I need bigger, it is no big deal to add another. Fixed the rear seal on the VD today. No biggie either,once I borrowed the BIG impact gun. Valve covers arrived. Just waiting for the damper.

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  • Damon
    replied
    I think Ship hit the nail on the head. The volume of coolant in the block should dictate the size of the heat HE. Since the big block requires a larger volume of coolant, it only makes sense that it should use a bigger HE to cool the larger volume of coolant.

    I have the aftermarket closed cooling system on my 383 from a very reputable company called Monitor, and the HE that came with the kit (it’s the same for all their SBs) is no larger than the one that was on my 351W.

    It seems the factory one, which was very expensive, was smaller (I could be wrong). If you go to the Mercury Marine website, just search for the parts list for one of their 383 and you should find the diagram of one that may have measurements. The Monitor website may have info too.

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  • Ship
    replied
    When I rebuilt my 351 with .060 over sized rings, it increased my displacement but didn't effect my heat reading at all. I would think the 350 based 383 should be similar. I also changed the pistons which added displacement.
    Last edited by Ship; 03-25-2022, 12:07 PM.

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  • Ship
    replied
    Jerry, since the 383 uses a 350 block the area of heat transfer should be the same. The little extra amount of heat SHOULD be in HP and a little extra exhaust. Look on line to see if the factory 383s look like they have the larger HE.

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  • Quik Fix
    replied
    I was thinking that because the big block HE was bigger, I may need bigger. I do have the bigger Johnson pump, new. Ordered a new damper from Fredwarner.net. $89 and, since I have spent a ton already, why not? Here is a tip. Don't lift the velvet drive by the tail shaft with the fork lift! Searching for a rear seal now.

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  • Ship
    replied
    Like Damon said, I don't think it will make a difference. When they size HE they don't make one for Florida and one for Maine. The water temperature being way different between them.

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  • Damon
    replied
    Do you think your engine will be running that much warmer? If the Johnson pump is the one that takes the bigger impeller, that’s the best! I personally don’t see why the standard stock HE won’t do.

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  • Quik Fix
    replied
    I ordered some new, Edelbrock black powder coated valve covers. Cheaper on Amazon than the used ones on facebook. Trying to figure the cooling system now. Want to put the HE in the tub in front of the engine and the expansion tank on the engine over the circulating pump. Don't want the BIG block stock unit, even though I have 4 of them. I don't think the stock HE for 351s is enough. Might have to combine 2. What y'all think?

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  • Pedlyr
    replied
    I found that aftermarket covers where too wide. Which now makes them too high. I tried 2 or 3 types and ended up with the stamped steel originals. I have center bolt style. Need that flat edge around the base. Game of fractions of inches. I even got them to fit but they leaked

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