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Thread: Swapout

  1. #1
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    Swapout

    Will a late '90's promax powerhead bolt onto a 2.4 mid without too much trouble. If it fit's would there be any real drawback of doing such a swap ?

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    Everyone says dont run a 2.5 on 2.4 adapter plates buttt....
    I did just that. installed a 2.5 on a 2.4 mid with 2.4 adapter plates and got little over 50hrs on it. lots of wot runs. Perfect water pressure great cooling , no issues for me. Just make sure u use the 2.4 gaskets. u will run hot with 2.5 gaskets. Mite have to trim exhaust dump holes to make em match

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    Quote Originally Posted by berdes View Post
    Will a late '90's promax powerhead bolt onto a 2.4 mid without too much trouble. If it fit's would there be any real drawback of doing such a swap ?
    WHICH adoptor plate are u going to use?

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    Quote Originally Posted by Merc 2.5 View Post
    Everyone says dont run a 2.5 on 2.4 adapter plates buttt....
    I did just that. installed a 2.5 on a 2.4 mid with 2.4 adapter plates and got little over 50hrs on it. lots of wot runs. Perfect water pressure great cooling , no issues for me. Just make sure u use the 2.4 gaskets. u will run hot with 2.5 gaskets. Mite have to trim exhaust dump holes to make em match
    are u using a 2.4 1pc, my plan is the opposite 2.4 on a ported 2.4 1 pc 1pc has BIG exhaust ports.
    Last edited by KIRCHNER; 11-12-2019 at 04:16 PM.

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    Thanks, but I thought all promax were 3.0 ?

    Quote Originally Posted by Merc 2.5 View Post
    Everyone says dont run a 2.5 on 2.4 adapter plates buttt....
    I did just that. installed a 2.5 on a 2.4 mid with 2.4 adapter plates and got little over 50hrs on it. lots of wot runs. Perfect water pressure great cooling , no issues for me. Just make sure u use the 2.4 gaskets. u will run hot with 2.5 gaskets. Mite have to trim exhaust dump holes to make em match

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    Don't know. Haven't taken anything apart yet. Should I assume bolt pattern, shaft spline, geometry are universal ?

    Quote Originally Posted by KIRCHNER View Post
    WHICH adoptor plate are u going to use?

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    Promax make 2.5 and 3.0. U got 225 or a 300?
    A 3.0 will not swap
    Last edited by Merc 2.5; 11-12-2019 at 05:42 PM.

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  9. #8
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    Neither one yet. Just a thought experiment at this point. There seem to a few of both available.

    Quote Originally Posted by Merc 2.5 View Post
    Promax make 2.5 and 3.0. U got 225 or a 300?
    A 3.0 will not swap

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    Ya the 3.0 promax is one of it's own. the 2.5 (200,225) different story. more can b swapped around
    Other words anything over 225 pm is a 3.0

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    OK, thanks.

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    Quote Originally Posted by berdes View Post
    Will a late '90's promax powerhead bolt onto a 2.4 mid without too much trouble. If it fit's would there be any real drawback of doing such a swap ?
    One piece yes..two piece no.

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  14. #12
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    Quote Originally Posted by Capt.Insane-o View Post
    One piece yes..two piece no.
    So you cant run any 2.5 on 2.4 200 adap plates? 2 piece ?

    I have one aet up just like that with 0 issues ever so far. Now I no u know exactly what ur doin also. Not being disrespectful at all. With that said. Reason I set mine up like this is because a builder here (well known) has set up many with no issues and it's the parts I had and everything has came out perfect. but everyone says cant b done. So I'm still kinda stumped by this. I do know cant mix the plates or gaskets again I am talking bout 2.4 200 with 2.5 200 powehead
    Last edited by Merc 2.5; 11-12-2019 at 08:53 PM.

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    I looked at using the 2.4 plate when I did my 2.5 clamshell swap but I couldn't find a reason not to use the 2.5 plate since I had it...

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    Ya I tried finding 2.5 plates but ended up no so easy come by and was told bout this , so I went with it. Truth b told I didnt no if it would work or not. I was goin on his experiences and word. But it worked flawlessly still workin great. I'm not tryin down grade or start chit in any way. Just conversation

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    I've run justa 'bout ever combination possible with 2.0's, 2.4's and 2.5's.. always use metal infused ph gaskets that fit tha "block" exhaust.. did tha "grindin' ta match exhaust on some and some not.. couldn't tell any difference... never a problem.. one piece and two piece present they're own problems with tha coolin' differences... jmo

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