Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Mustang Forums
2011-2014 Mustangs
Engine/Tuning
5.0 Coyote Valve Spring Upgrade: Brands, size, and price
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="RSKtakR" data-source="post: 16863879" data-attributes="member: 64555"><p>Time to bring this up again sort of.. lots of good info here. I am about to have a 5.2 short block built for my 2013 GT, I bought a set of new OEM Gen2 heads with OEM valves and springs installed that will just get my current stock gen1 cams. The shop that is going to assemble the motor and install it for me asked me about valve springs and mentioned running Pac 1234x's. Right now, I have a 11:1 rods/pistons short block and stock gen1 heads/cams VMP Gen3r blower making 930whp at 19lbs through the built 6r80. The 5.2 will be 12:1, and get the same blower but with a 69mm upper vs the 72mm that is on it now so whp would go up to 1100ish at 21-22psi maybe. I don't have a problem swapping up to the Pac 1234x springs while everything is apart as its just cheap insurance and the $600 cost of springs is minimal compared to overall cost here and at that boost level and hp level, the springs are probably needed. But what about the valves themselves? Will the stock gen2 valves hold up to the added pressure of those Pac springs? I had a pushrod motor at one time that had stronger springs and Manley valves and one day the damn valve broke off the stem and fell into the cylinder, and I don't want that shit happening again. If new valves are suggested, what's a good dependable replacement?</p></blockquote><p></p>
[QUOTE="RSKtakR, post: 16863879, member: 64555"] Time to bring this up again sort of.. lots of good info here. I am about to have a 5.2 short block built for my 2013 GT, I bought a set of new OEM Gen2 heads with OEM valves and springs installed that will just get my current stock gen1 cams. The shop that is going to assemble the motor and install it for me asked me about valve springs and mentioned running Pac 1234x's. Right now, I have a 11:1 rods/pistons short block and stock gen1 heads/cams VMP Gen3r blower making 930whp at 19lbs through the built 6r80. The 5.2 will be 12:1, and get the same blower but with a 69mm upper vs the 72mm that is on it now so whp would go up to 1100ish at 21-22psi maybe. I don't have a problem swapping up to the Pac 1234x springs while everything is apart as its just cheap insurance and the $600 cost of springs is minimal compared to overall cost here and at that boost level and hp level, the springs are probably needed. But what about the valves themselves? Will the stock gen2 valves hold up to the added pressure of those Pac springs? I had a pushrod motor at one time that had stronger springs and Manley valves and one day the damn valve broke off the stem and fell into the cylinder, and I don't want that shit happening again. If new valves are suggested, what's a good dependable replacement? [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Mustang Forums
2011-2014 Mustangs
Engine/Tuning
5.0 Coyote Valve Spring Upgrade: Brands, size, and price
Top