Cylinder head Chrysler 75 Hp

ErSa

Seaman Apprentice
Joined
Jan 23, 2022
Messages
46
Is the cylinder head from a 70 Hp Model 7071 compatible with
power head 75 Hp Model 757HB? The older cylinder head (7071) seems
to have more easy access to the thermostat. See enclosed pictures.
After searching the forum, I think I will find the answer in thread "

3 Chrysler heads compared. 70hp, 75hp, 85hp"! ;)

 

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Last edited:

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,447
I suspect the newer design offers better Cooling, which allows higher compression and/or more spark advance without detonation. and since the entire cover has to come off to access the Thermostat, it is more likely that the water passages will get a Cleaning
 

Nordin

Commander
Joined
Jun 12, 2010
Messages
2,555
ErSa, yes read that thread it will give you some information and as jimmbo says better cooling as the water will flow over and around the spark plugs.
But check what size of the head bolts it has.
Some of the old heads had lager bolts if you choose the older typ of head.
 

ErSa

Seaman Apprentice
Joined
Jan 23, 2022
Messages
46
Thanks for your advices. Now I have to choose between good cooling and bad access to thermostat or bad cooling and good access to thermostat. :)
 
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