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strega

07-31-2010 03:15 AM

Will these heads work??

Hi guys, wondered if you would know if these heads would fit an 87 merc 454 mag engine, mine are in need of a fair amount of work so these would be easier and cheaper but only if they would work well.

What might be the pro's and con's of fitting these?

http://cgi.ebay.co.uk/CHEVROLET-BIG-...item2308f4f970

GTOFFSHORE

07-31-2010 07:54 AM

They look ok. Oval ports are good for a 454 as long as they are not peanut heads. Ask him for the casting numbers and then look them up and see what thy actually are. And you realize those valves will need to be changed to severe duty ones or they won't last long.

pslonaker

07-31-2010 09:19 AM

Those heads are also closed chambers. Normal heads on a Mercruiser are OPEN chambers.

jeffswav

07-31-2010 10:07 AM

The chambers on those are really small, it will bump up your compression. Also those are small valves, you can have larger ones cut.

FIXX	07-31-2010 11:27 AM

Fixx

all you will get is alot of torwue with those heads,,with the small valves in them your power range will be all over @ 4200 rpm..find somthing else..

jeff1000man

07-31-2010 11:39 AM

Good upgrade head for 454

http://www.jegs.com/i/World-Products...96#moreDetails

strega

07-31-2010 04:02 PM

Great info guys, think I will stick with reconditioning mine.

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