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Inspector 12-07-2012 02:03 PM

500 EFI Valve Springs
 
OK, there are several older threads discussing this but is there anything new in valve springs for a 500 EFI camshaft profile? What springs match the recommended installation specs and will last FOREVER?

mr3dman 12-07-2012 02:19 PM

nothing lasts forever.

POWERPLAY J 12-07-2012 02:29 PM


Originally Posted by mr3dman (Post 3828118)
nothing lasts forever.

Yup

MILD THUNDER 12-07-2012 05:43 PM

Isky Tool room series is a great spring.

protechcoat 12-07-2012 10:26 PM

comp cams 929-16 will work great we have installed hundreds without any problems

Young Performance 12-08-2012 12:23 AM

I have had excellent luck with the ISKY 8005A. Have done them on more 500 efi's than I can count. I sell dozens and dozens a year to owners of 500's.
Eddie

Inspector 12-09-2012 05:07 PM

More questions...
 
It sounds like there is nothing new in valve springs. But I have questions on the replacement springs commonly being used. The cam card for the Crane 169621 lists the spring requirements at 150 lbs at 1.900” and 454 lbs at 1.310”. The Comp 929 as I understand it was used by MerCruiser in the production 500 EFI engine for several years. It typically has an expected life of 200 to 250 hours and has 139 lbs at 1.900” and 397 lbs at 1.310”. Is the lower spring pressure acceptable due to the lower RPM the 500 EFI runs vs. the max RPM for the 169621 of 6500? The Isky 8005A is an even lower rate spring with 125 lbs at 1.900” and 361 lbs at 1.310”. How soft a spring can assure the roller lifters never leave the cam up to 5400 RPM? Are these softer springs set up to compensate for the lower rate, lower installed height without getting into coil bind? How long is the 8005A expected to last on this cam profile? It looks to me like the Isky 8205SP and 8205Plus would fall into the acceptable spring rate range with improved longevity, both have 150 lbs at 1.900” and 409 lbs at 1.310”. Does anyone have any experience with these two Isky Springs on the 500 EFI cam?
Thanks.

Rookie 12-09-2012 06:27 PM

I know JimV sets up a lot of heads for hydraulic rollers with Comp 929 springs.
Also if Eddie Young uses the Isky 8005A I think you have 2 good choices that are proven.

Young Performance 12-09-2012 08:45 PM

There is no reason in the world to have over 400 pds of spring pressure on a 5400 rpm 500 efi. Put the 8005 ISKY's in at 1.870-1.875.
Eddie

chris2k2 09-11-2015 04:41 PM

What are the best head gaskets for 500 EFI?

MrCIG 11-13-2016 06:38 PM

Ok going to do valve springs this winter on my 2004 500EFI's

Anything change since 2012?

What is the original install height of the the valve springs

Thanks
Mark

MILD THUNDER 11-13-2016 07:50 PM

I have a valve spring mic if you need it Mark. Also have a nifty valve spring compressor , that works great for compressing the springs when the heads are on the engine. It actually locks in place when the spring is compressed, which helps when fighting to get the locks positioned right. The old prybar style i had, jesus, hands would be killing me after a while.

MrCIG 11-19-2016 07:35 AM

Thanks Joe we may take you up on the spring compressor. Kenny has a mic and spring tester. But he has an old school compressor

Probably work on them after the Holidays

Mark

28cigarettess 11-19-2016 08:54 AM


Originally Posted by MILD THUNDER (Post 4500245)
I have a valve spring mic if you need it Mark. Also have a nifty valve spring compressor , that works great for compressing the springs when the heads are on the engine. It actually locks in place when the spring is compressed, which helps when fighting to get the locks positioned right. The old prybar style i had, jesus, hands would be killing me after a while.

Could you possibly post the make and model of your compressor? Probably looking at doing springs this winter and anything to make it easier would be great.:)

trex232 12-06-2016 12:02 PM

I have a 99 500efi with 330hrs should I replace the springs and head gaskets or just springs, fresh water boat

MrCIG 12-28-2016 08:09 PM


Originally Posted by Young Performance (Post 3828375)
I have had excellent luck with the ISKY 8005A. Have done them on more 500 efi's than I can count. I sell dozens and dozens a year to owners of 500's.
Eddie

Eddie, do you use the stock retainers or have you changed them to 10deg?

Thanks
Mark

Griff 12-28-2016 11:07 PM


Originally Posted by trex232 (Post 4507309)
I have a 99 500efi with 330hrs should I replace the springs and head gaskets or just springs, fresh water boat

I would do complete top ends. Head gaskets, springs, valve job and thorough inspection of lifters and rockers and clean injectors.
It should be good to go for at least another 330 hrs after that.

mike tkach 12-28-2016 11:44 PM


Originally Posted by Griff (Post 4513839)
I would do complete top ends. Head gaskets, springs, valve job and thorough inspection of lifters and rockers and clean injectors.
It should be good to go for at least another 330 hrs after that.

i agree except for the 330 hour part,250 sounds better imo.at least on the springs but if easy on them maybe 300 hrs.


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