Correct valve spring installed height?
Thread Starter
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Laughing Gas
Joined: Jun 2010
Posts: 1,056
Likes: 10
From: Indiana, PA
Correct valve spring installed height?
I am installing the valve springs in my FE that came in my new Comp cam kit. I called Summit and they said to install them at the stock height (1.820), then I called Comp and they said to install my springs at 1.800 which would put the pressure up to 325ish. open. This almost seems like a lot of pressure for a flat tappet cam? What do you guys recommend?
Spring specs
1.800- 109 lbs.
1.300- 317 lbs
Spring specs
1.800- 109 lbs.
1.300- 317 lbs
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,562
Likes: 424
From: Long Island USA
.020" makes that big a difference? Personally, I'd believe the spring manufacturer over the reseller 
What RPM range are you looking at running? The lower the pressure, the lower the RPM at which the valves will float.
What RPM range are you looking at running? The lower the pressure, the lower the RPM at which the valves will float.
Super Moderator
Joined: Apr 2004
Posts: 34,535
Likes: 2,835
I am installing the valve springs in my FE that came in my new Comp cam kit. I called Summit and they said to install them at the stock height (1.820), then I called Comp and they said to install my springs at 1.800 which would put the pressure up to 325ish. open. This almost seems like a lot of pressure for a flat tappet cam? What do you guys recommend?
Spring specs
1.800- 109 lbs.
1.300- 317 lbs
Spring specs
1.800- 109 lbs.
1.300- 317 lbs
Under spring specs you reference 1.800 and 1.300.
Are we missing something? 1.800 vs. 1.820 would or should not result in the 200+ lb difference you show.
Thread Starter
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Laughing Gas
Joined: Jun 2010
Posts: 1,056
Likes: 10
From: Indiana, PA
I know it isn`t much difference but I just don`t want to put too much pressure on my cam and wipe a lobe out.
Also my book says stock valve springs are around 280lbs open.
Super Moderator
Joined: Apr 2004
Posts: 34,535
Likes: 2,835
I was missing something. Thanks for not calling me names.
On the subject, some numbers here you have to wade through it, but on topic:
332-428 Ford FE Engine Forum: Edelbrock 60069 heads spring pressure
More:
332-428 Ford FE Engine Forum: Valve spring pressure; what is too much?-
On the subject, some numbers here you have to wade through it, but on topic:
332-428 Ford FE Engine Forum: Edelbrock 60069 heads spring pressure
More:
332-428 Ford FE Engine Forum: Valve spring pressure; what is too much?-
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
The thread makes me think you are already aware, but JTMS
Dont assume that a spring gauge, set to specs will emulate your FE valve train spring geometry. Check each, as the spring seats are cut not milled like VC rail or rocker stands. CB and IH are an animal of their own. What will likely be the find is all are different from an OEM cut spring seat. Shims only duplicate the issue creating spring press diff. Take a real good look at all the geometry and it will make sense, perfection is a pipe dream. The rockers are on a rail, adjustable only by = base shims under all stands. Done right IMO install 16 seats, cut in reference to stand bosses so all V stem locks align. Add shims to base of springs atop cut VP seats to match coil bind, IH pressures, then if all is ok. Degree cam and rockers, assured the push rods are identical..
Or just bolt that SOB and run it!!
Dont assume that a spring gauge, set to specs will emulate your FE valve train spring geometry. Check each, as the spring seats are cut not milled like VC rail or rocker stands. CB and IH are an animal of their own. What will likely be the find is all are different from an OEM cut spring seat. Shims only duplicate the issue creating spring press diff. Take a real good look at all the geometry and it will make sense, perfection is a pipe dream. The rockers are on a rail, adjustable only by = base shims under all stands. Done right IMO install 16 seats, cut in reference to stand bosses so all V stem locks align. Add shims to base of springs atop cut VP seats to match coil bind, IH pressures, then if all is ok. Degree cam and rockers, assured the push rods are identical..
Or just bolt that SOB and run it!!
Thread Starter
|
Laughing Gas
Joined: Jun 2010
Posts: 1,056
Likes: 10
From: Indiana, PA
I was missing something. Thanks for not calling me names.
On the subject, some numbers here you have to wade through it, but on topic:
332-428 Ford FE Engine Forum: Edelbrock 60069 heads spring pressure
More:
332-428 Ford FE Engine Forum: Valve spring pressure; what is too much?-
On the subject, some numbers here you have to wade through it, but on topic:
332-428 Ford FE Engine Forum: Edelbrock 60069 heads spring pressure
More:
332-428 Ford FE Engine Forum: Valve spring pressure; what is too much?-
Hahaha, I like that info
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