Conversion MAG 454 mark IV to MAG 502
 

Maybe some can help me out.

Unfortunately the base of both MAGs 454 Mark IV engines have frost damage. Most probably this will be covered by my insurance.
As the insurance might cover only the costs of the damaged parts, my question is if it is possible to have a seamless transition to a Mag 502 with making use of the existing heads, manifolds, carbs and whatever can be re-used.
The engines have 380 hours on them, so I assume the heads will be in pretty good shape.

Does anyone have an idea if this is feasible?

Thanks in advance for your response.

Paul

in a word no ....Gen IV is a 2 piece rear seal ....502 is Gen V or newer has 1 piece seal ....maybe the insurance company will buy new short blocks? But then you got the issue of the heads working on newer blocks which will work but you have to make sure you have the right head gaskets so water passages are correct ... never easy ......m

[QUOTE=Paul311;3111858]Maybe some can help me out.

Unfortunately the base of both MAGs 454 Mark IV engines have frost damage. Most probably this will be covered by my insurance.
As the insurance might cover only the costs of the damaged parts, my question is if it is possible to have a seamless transition to a Mag 502 with making use of the existing heads, manifolds, carbs and whatever can be re-used.
The engines have 380 hours on them, so I assume the heads will be in pretty good shape.

Does anyone have an idea if this is feasible?

Thanks in advance for your response.


not that easy to do you will find the oil filt adapter to block will be different plus all the oil cooler hoses -flywheel is different - no hole in the block for a fuel pump best to get new style sea pump that has the pump mount on it . if your going w a new 502 shortblock it will most likely have roller cam and pushrods will be diff . plus carb may be lean . it can be done but its costly . it would be easier to buy 2 complete used drop ins their are several advertised in classifieds even some 454 efis will drop in

notice location ....gona be tough .....m

Thanks for the help guys,

I didn't know that 502 were only gen V and newer.
The bottleneck in the Netherlands is also the level of knowledge and the availability of parts.
It seems to me that the best way to go is with complete drop-in engines. Today I heard that there is no replacement anymore for the base of the 454 mark IV magnum.
Let's see what is insurance will cover, up till now they seem to be willing to cover 40% of the value of new enigines taken the age of the boat into account.

There are still Mark blocks available out there. They're not cheap but compared to the money for a swap-over, it may be the best option. Companys like World Products still list brand new Mark blocks.

Here's a link to some good information comparing the Mark IV, Gen V, and Gen VI blocks. Bottom line: The Mark is not really interchangeable with the Gen.

http://www.chevyhiperformance.com/te...ons/index.html

Thanks for the info. I briefly browsed their website and submitted an email for a quotation.
As far as I know now, insurance will probably cover around
16K euro including labor, that is around 19K$ nowedays.

Better hurry, that Euro is dropping!!!!!!:coolcowboy:

heck ... add about 16K to that and I'll send you the enitre boat!!! ....m