500 efi long block replacement
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500 efi long block replacement
I have a 500 EFI that threw a rod and ended up cracking the block.
I want to get a new long block and bolt all of my 500 EFI
componnants on to it. I understand that I may need to change the cam.
If you have the cam specs that would be great.
Max performance is NOT my main concern as I am running this in a 20.5 Cougar sport skier.
I purchased this motor from an offshore only member.
This engine had been built by "Jasper Engines" and was a mess inside.
I am looking for a 502 longblock which one is correct?
Thanks
I want to get a new long block and bolt all of my 500 EFI
componnants on to it. I understand that I may need to change the cam.
If you have the cam specs that would be great.
Max performance is NOT my main concern as I am running this in a 20.5 Cougar sport skier.
I purchased this motor from an offshore only member.
This engine had been built by "Jasper Engines" and was a mess inside.
I am looking for a 502 longblock which one is correct?
Thanks
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#5
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Here are the specs for a 500efi cam. It was a Crane custom grind made for the Merc 500efi. Not sure if Crane makes them anymore.
500 EFi cam
292*/298* Adv
230*/236* @ .050
.598"/.610" @ valve
114* LSA
109* ICL
119* ECL
The Crane 168731 is very close in specs to the 500efi cam and can be used as a replacement
http://www.summitracing.com/parts/crn-168731
500 EFi cam
292*/298* Adv
230*/236* @ .050
.598"/.610" @ valve
114* LSA
109* ICL
119* ECL
The Crane 168731 is very close in specs to the 500efi cam and can be used as a replacement
http://www.summitracing.com/parts/crn-168731
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It will work except for cam and heads need to be worked, ie, inconel ex valves, springs matched to cam you use and loosen up guide clearence a little. That would do you.
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I did a zz502 short block last year. You don't really need the long block if you want to use your existing heads. I used my cam and had my existing heads reworked. I have put about 30 hours on it since we did the change and everything worked out great. I think I paid $4,995 from jegs with free freight. I sold the cam that came in the engine on ebay. If you have any questions PM me and I will give you my phone number.
This is the one I bought.
http://www.jegs.com/i/Chevrolet+Perf...68782/10002/-1
This is the one I bought.
http://www.jegs.com/i/Chevrolet+Perf...68782/10002/-1
Last edited by Steel Outlawed; 11-26-2012 at 07:42 PM.
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Hello again Guys and thanks for your input.
I have puchased a GM Marine 502 HO longblock
I want to back to or as close as possible to the original 500 EFI specs
Can someone reccomend who I should have work on my Heads?
I live in Washington state and it would be great if I was able to do it local
any other advice in making the motor dependable would be appreciated.
Thanks
I have puchased a GM Marine 502 HO longblock
I want to back to or as close as possible to the original 500 EFI specs
Can someone reccomend who I should have work on my Heads?
I live in Washington state and it would be great if I was able to do it local
any other advice in making the motor dependable would be appreciated.
Thanks