The Ford Barn

lonewolf · 09-28-2018, 06:43 PM

A little background
I'm trying to help someone get there motor (8ba) running properly. It's a fresh rebuild from a machine shop that is not familiar with flatheads. What I found was an isky 88 cam with stock valves,isky 4005 springs & 87f spring retainers with no shims installed. I can lift a valve up 1/4" off the seat with 2 fingers.

Isky calls for an installed spring height of 1.687" with 115 lbs of seat pressure.

That seems like I'm going to need a whole lot of shims and an excessive amount of seat pressure.

I've always used the 185g springs with never more than 90lbs of seat pressure on a lot bigger cam.

So should I go by iskys recommendations and use the 4005 springs?

Or should I use 185g springs?

Or ?

Thanks in advance

Ol' Ron · 09-28-2018, 08:51 PM

Deleted by ron

Ol' Ron · 09-28-2018, 08:53 PM

The isky 88 cam is a very mild cam and only 50 Lbs is necessary for a street engine. Over the years I've sued several of them. Not a very good choice.stock springs with a .060" shim

flatjack9 · 09-28-2018, 09:05 PM

I'm with Ron.

Kahuna · 09-29-2018, 09:52 AM

Agree with above

lonewolf · 09-30-2018, 07:17 AM

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Thanks for the help. I'm not looking forward to telling him to replace his springs and retainers that he has about $275.00 invested in

flatjack9 · 09-30-2018, 10:52 AM

That comes from picking the wrong builder.

09-28-2018, 06:43 PM	#1
lonewolf Senior Member Join Date: May 2010 Location: Michigan Posts: 464	Isky 88 cam and double spring question A little background I'm trying to help someone get there motor (8ba) running properly. It's a fresh rebuild from a machine shop that is not familiar with flatheads. What I found was an isky 88 cam with stock valves,isky 4005 springs & 87f spring retainers with no shims installed. I can lift a valve up 1/4" off the seat with 2 fingers. Isky calls for an installed spring height of 1.687" with 115 lbs of seat pressure. That seems like I'm going to need a whole lot of shims and an excessive amount of seat pressure. I've always used the 185g springs with never more than 90lbs of seat pressure on a lot bigger cam. So should I go by iskys recommendations and use the 4005 springs? Or should I use 185g springs? Or ? Thanks in advance

09-28-2018, 08:51 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: Isky 88 cam and double spring question Deleted by ron Last edited by Ol' Ron; 09-28-2018 at 08:56 PM.

09-28-2018, 08:53 PM	#3
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: Isky 88 cam and double spring question The isky 88 cam is a very mild cam and only 50 Lbs is necessary for a street engine. Over the years I've sued several of them. Not a very good choice.stock springs with a .060" shim

09-28-2018, 09:05 PM	#4
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Isky 88 cam and double spring question I'm with Ron.

09-29-2018, 09:52 AM	#5
Kahuna Senior Member Join Date: May 2010 Location: NorCal Posts: 2,617	Re: Isky 88 cam and double spring question Agree with above

09-30-2018, 07:17 AM	#6
lonewolf Senior Member Join Date: May 2010 Location: Michigan Posts: 464	Re: Isky 88 cam and double spring question Sponsored Links (Register now to hide all advertisements) Thanks for the help. I'm not looking forward to telling him to replace his springs and retainers that he has about $275.00 invested in

09-30-2018, 10:52 AM	#7
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Isky 88 cam and double spring question That comes from picking the wrong builder.