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Discussion Starter #1
Cam is 218/[email protected] .050, .360/.359 lobe lift. I've got some comp 1.7 pro magnums I was planning to use with it, as it's a mild build it won't see over 6500RPM. Edelbrock RPM heads, 2.02 ferrera intakes, stock Edelbrock exhausts. I've got some stuff laying around and thought I could use these new comp 977 springs, with titanium retainers. They're [email protected] 1.250, at a rate of 441. Would they work or should I just get some PAC or equivalents in there?
Thanks!
http://www.summitracing.com/parts/cca-977-16
 

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Discussion Starter #3

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it will work the 977

it is tight at .612 lift

like real tight.

It will be happy with 1.6 rockers or

a 1.875 installed height.

I like to live dangerously I like it tight.
 

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Discussion Starter #5
it will work the 977

it is tight at .612 lift

like real tight.

It will be happy with 1.6 rockers or

a 1.875 installed height.

I like to live dangerously I like it tight.
By tight you mean in the low end of the sweet spot above coil bind?
 

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By tight you mean in the low end of the sweet spot above coil bind?
coil bind is not far away @1.195

you have .612 lift

1.850 - .612= 1.238

1.250 is your open pressure spring measurement

you are actually in a sweet spot with .070 and change

worth of clearance.

Better check each and every one when assembling.


Looks to be a decent match

What type of application is the engine for?

What lifters will you use?
 

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Many people run coil bind clearance all over the place as far as tight.

I have seen it tight as .030 but I would never be that brave.

I like em around .060 plus or minus .010
 

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Discussion Starter #8
I like em around .060 plus or minus .010
I'd heard before that .100 was a good safe number, lower was actually better for the spring. I could run 1.6's and have plenty of room, but I already have an extra set of 1.7's so thought I'd see how they'd work. I thought I'd have room by the numbers, but wasn't sure if the spring rate would be enough.
Comp hydraulic rollers is what the engine has in it, don't recall the part number.
This for a street car, occasional track outing a few times a year.
 

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I'd heard before that .100 was a good safe number, lower was actually better for the spring. I could run 1.6's and have plenty of room, but I already have an extra set of 1.7's so thought I'd see how they'd work. I thought I'd have room by the numbers, but wasn't sure if the spring rate would be enough.
Comp hydraulic rollers is what the engine has in it, don't recall the part number.
This for a street car, occasional track outing a few times a year.
If you already have the spring, run it.

buy some titanium keepers to lighten them up some more

if you worried about spring rate.
 

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Super_Dave, you can probably use the Comp springs and be ok. If you decide to use PAC Springs or need any other valve train parts let me know. I am now a wholesale dealer for the full PAC product line which includes springs, retainers, locks, cups, locators, shims, etc. etc. I will be able to hook you up with a good price and save you some money. I can also help you pick out the right parts needed for your setup. Thanks
 

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Discussion Starter #11
If you already have the spring, run it.

buy some titanium keepers to lighten them up some more

if you worried about spring rate.
I have some of those too, forgot to mention that in the original post.
 
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