HP 500 carb spring recomendations

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07-11-2004 | 06:56 PM

sre

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Joined: Mar 2002

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From: Livonia, Michigan

HP 500 carb spring recomendations

Anyone have the parts numbers for the springs and retainers?

How about installed height and pressure?

Thanks in advance!!!

07-11-2004 | 07:21 PM

Lmarth

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Joined: Oct 2002

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From: Fairport,NY

Re: HP 500 carb spring recomendations

Here's what the Mercruiser Service Manual shows for the HP500 valve springs- 150# on the seat with a 1.90 " installed height. 420# open spring pressure. Can't help with the part numbers.--Lou

07-11-2004 | 08:44 PM

Infomaniac

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From: Broken Arrow, OK

Re: HP 500 carb spring recomendations

Get Isky 8205 Plus springs. Titanium retainers and new locks from Doug Herbert.

07-12-2004 | 09:56 AM

sre

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Joined: Mar 2002

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From: Livonia, Michigan

Re: HP 500 carb spring recomendations

Thanks for the replies!

I have heard good things on the comp springs as well, any feedback?

07-12-2004 | 12:32 PM

rmbuilder

MarineKinetics

Joined: Oct 2002

Posts: 942

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From: Rochester, NY

Re: HP 500 carb spring recomendations

sre,
The springs for the HP 500 cam (#169611) are Crane part #99896.
132#@1.906"
414#@1.306"
Stack 1.085"
470 #/in.
Retainers #'s vary according to application.
As per infomaniac the Isky springs are good pieces.
It has been our experience that PSI springs are the finest springs on the market today. They supply many IRL, Cup, Busch, Truck, Pro Stock, etc. teams today and also manufacture the premium Tool Room line for Isky.
Bob