TOPIC: Power Head swap Merc 500 1970 and 1972

Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #42997

stashm2
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Hello,

I have a 1970 Merc 500 Red stripe with a bad piston and a good mid and lower, and a 1972 blue stripe with a great power head but a very corroded mid and lower. I would like to know if these two powerheads are interchangable or if there is a difference in the exaust ports ect.

Thanks.
Jesse

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Re: Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #43012

dave bernard Offline Platinum Boarder Posts: 1471 Karma: 95 Thank you received: 30	i think the are. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #43016

stashm2 Topic Author Offline Contributing Member Posts: 666 Karma: 25 Thank you received: 1	Looking at parts lists etc. It looks liek they should I guess I will find out Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #43037

Dr_Frankenmerc
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Jesse,
If you make the swap at the gasket between the powerhead and the exhaust extension plate you will be fine.
That gasket is Mercury Marine part number 27-796501 or through your local NAPA it would be Sierra Marine Part number 18-0103.

Be aware though - that if you attempt to swap out the lower unit off one to the other it 'might not' work - but if things above the gasket mentioned are kept togehter from the same year and things below the gasket are kept together from a different year - what you want to do will work.
Doc F

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Re: Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #43064

joenawlins Offline Contributing Member Posts: 554 Karma: 6 Thank you received: 0	Hey Doc, Good to see you here!!! Joe Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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Re: Power Head swap Merc 500 1970 and 1972 14 years 3 months ago #43130

stashm2 Topic Author Offline Contributing Member Posts: 666 Karma: 25 Thank you received: 1	Doc. Thats exactly what I wanted to know and plan to do! Thank you all for the info! Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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