Advanced Search Search Tips. Fits Factory Heads, no machining required. Application: Hydraulic Roller, up to. Fitment: GT40 heads for GT40p kits, check our other ads. GT40 heads require special attention when selecting valve springs for high lift, high performance Hyd Roller Cams.

Since these heads come with different tip length valves, retainers and springs from the factory, care must be taken when selecting valve springs, retainers and locks. Unlike some of the earlier SB Fords where the tip lengths were the same for both intake and exhaust, GT40 heads use two different lengths.

Since the goal is to use the same high performance springs on all sixteen valves, special retainers and locks are required to make it possible.

Our drop in valve spring kit is specially engineered to fit GT40 heads. It comes with select retainers and locks designed to fit GT40 staggered tip lengths. Fits GT40 heads without additional modifications.

stock gt40 valve springs

Designed for mild to moderate high performance Hydraulic Roller cams, our kit will handle most cams up to around degrees duration. We'd be happy to verify compatibility. Works great with many of today's popular performance cams. Suitable for 1. Vsk7h works with a large number of hi performance street roller cams. These are custom made springs exclusive to Alex's Parts. Spring Specifications:. Kit includes:. Suggestions: Measure spring installed heights- This kit normally requires some shims to obtain the target installed height.

These items are added in at slightly discounted prices with reduced shipping rates.

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Please note our viton valve seals are premium OE style replacement seals which are far superior to gasket set seals. Note: This item is intended for h yd roller cams. Hyd flat tappet cams normally use a lower seat pressure such as Lbs. All prices are in USD. Copyright Alex's Parts Sales. Sitemap Ecommerce Solution by BigCommerce.What's New? Log in. Remember Me? GT40P, B Results 1 to 18 of Thread: GT40P, B If it were my car I would upgrade the springs. If you don't replace the springs, you might be fine, or you might smack pistons and valves.

The B cam is pretty low lift, but duration is a big player when it comes to valve float, and it has plenty of duration. I agree, upgrade. The B cam is. I agree. Springs are much more important than most people realize.

I bent some valves before so I have first hand experience. Do it once right or do it twice. Its a gamble. How lucky do you feel? Hotchkis suspension. Crane also has a kit with locks and seals I think, though I have no clue what the part number is. You might consider replacing just the exhuast springs, to my understanding they are the weaker of the two. Or you can choose to learn from others mistakes, mainly my own Originally Posted by 50 Proof.

Also, the valve springs on the explorer are weak.What's New? Log in. Remember Me? GT40p valve springs? Results 1 to 12 of Thread: GT40p valve springs? Well I just got my GT40p heads. My question is Will the stock springs work up to rpm? The heads and springs are brand new. That's as far as I probably will push this engine unless I get really excited out there.

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My Performer cam probably isn't good for much more than that even though my bottom end is good to about rpm. Last edited by wgt; at AM. Pics in my album!

stock gt40 valve springs

Total molestation! Build Pics in 3 albums! What lift cam? Stock GT40P springs will be about the same as 5. Not close to the HO springs.

stock gt40 valve springs

Otherwise, I went with the tfs valve spring kit. Jeremy, Do you have a part for the trick flow valve spring kit? Thanks, Dick. Just use the comp cams replacement Thanks Hooptie. I'm going to check the open pressure and seat pressure of the stock GT40P springs and see how they compare to the specs. I will post my findings. The correct thing to due is use the springs the cam manufacture states.

There is more to spings then just lift. Yoy have ramp rate pressure, coil bind, retainer to valve stem height and so on.Saved - View your saved items. We're sorry. We couldn't save this product at this time. Fitment: Details. I didn't notice the advise to mill the stock heads so the inside spring had clearance which resulted in 16 bent pushrods, one broken rocker and a couple broken springs during the motor break in.

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My own fault but make sure to note the possible need for machine work. Having my heads ported, a valve job done, and the valve seats refinished. Going to install these springs with 1. Will upload photos when completed! Purchased these for my supercharged notch. Showed up in the mail two days after ordering. Thanks AM. Great product and a must have for an after market cam. These springs will require milling for use on GT40P heads.

Will this springs work with my xehr cam,1. These springs will work but may require some milling. We do recommend new steel retainers. Otherwise, you will not need any additional parts. This is for my And i was wondering Is this all i need for installation?

Or do i need to purchase valve spring retainers and valve springs locks? Or can i use the stock retainers and locks? We recommend new steel retainers with these springs, other than that, you should be good to go.

Some milling of the heads is required for installation. These Comp Cams Valve Springs would not be recommended for use with a stock cam due to their design, but will work well with the E The total amount needing to be milled from the heads can vary due to oem production tolerances in the heads.

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A qualified machine shop can determine how much must be milled and perform the necessary machine work. We recommend new steel retainers with these springs. They do fit in the spring pocket and can be setup for cams up to about.

AFR 's should not require milling, however depending on the cam you are using these may not be adequate. Mechanical expertise or professional installation required. No guide available for this part yet.

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Tech Guides: Cylinder Head Upgrades.Written By: Connor MC. It's no secret the old-school 5. It's also well-known how easy it is to wake up your 5. Stock Foxbody cylinder heads have very poor airflow, but luckily the Mustang aftermarket has a ton of upgrades available.

To squeeze some more ponies out of your Fox Body Mustang, upgrading the cylinder heads can lead to some substantial results. This guide contains a Fox Body cylinder head flow chart and information on available upgrades, ranging from the stock E7 heads to fully prepped, CNC machined aluminum beauties. The stock compression on the 5. It made hp rpm, and ft.

Upgrading Fox Body Cylinder Heads

The 5. However, come the 21st century, the meager HP output by their mighty 5. Luckily, despite the age of these cars, ongoing research and experimentation by aftermarket companies has yielded some impressive new parts to really wake up that low-on-power 5. They just don't flow enough air into the engine. They also weigh quite a bit, as they are cast from iron. This guide presents the best options to upgrade your Fox Body Mustang's cylinder heads.

Porting heads involve using a rotary tool dremel and a burr to restructure the passageways to optimize air flow through the cylinder head. Remove unnecessary casting material, smoothing out imperfections, and polishing the chambers are all part of the process. Porting these E7 heads, even an A job, may yield a 30HP gain. Of course, you can do it yourself. Many enthusiasts have. With some dedication and careful work, you can port it yourself. Alas, it is also just as easy to hamper performance as it is enhance it if you are a beginner.Trick Flow Warranty - Click Here.

Ford Mustang - 79 - 80 - 81 - 82 - 83 - 84 - 85 - 86 - 87 - 88 - 89 - 90 - 91 - 92 - 93 - 94 - Upload a Photo. Upgrade your valve springs with this Trick Flow valve spring kit for Mustang ! Add to Wishlist Call to Order. Checkout our current Sales!

We are currently shipping packages and orders at full capacity with no delays. Local Will-Call pickup services are temporarily unavailable. Product Description Trickflow Performance Upgrade This Trick Flow valve springs kit allows you to install a high performance cam of up to. The Mustang 5. This Mustang valve spring upgrade kit features hardened chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions.

Best of all, no machining is required! Installation Instructions Download the pdf. Customer Photos 11 Upload a Photo. Vehicle Applications Ford Mustang - 79 - 80 - 81 - 82 - 83 - 84 - 85 - 86 - 87 - 88 - 89 - 90 - 91 - 92 - 93 - 94 - It takes time, skill, and the right combination of parts to allow your engine to produce optimum power levels.

What Cam and Springs to Use for GT40 Heads

Trick Flow engineers use advanced Computer-Aided Design CAD work stations and high-tech 3D modeling to develop and analyze components quickly and accurately. Trick Flow machinists use state-of-the-art rapid physical prototyping, CNC-machining centers, and hot rodding know-how to turn designs into molds and foundry tooling.

Prototypes and products are subjected to hours of relentless testing on one of Trick Flow's dynamometers, and extensive road and race track data is gathered to guarantee parts perform as intended. Trick Flow's commitment to quality combined with a "zero defects" attitude ensures Trick Flow products will exceed your expectations.Welcome, Guest. Please login or register.

Did you miss your activation email? News: All Club Events have been postponed. Home Help Search Login Register. So I ended up buying some GT40 heads not p's for my What would be the best cam and springs to use for these heads in a Windsor? No not a roller. Well its a reco stockso I'm pretty sure its a flat tappet. Any cam your going to need to change the springs - the factory ones would be shot.

The Gt40 is the best factory iron head but not great compared to after market so be realistic. I would run a roller cam using linked bar lifters. So my recipe; 1 A set of Howards Linked bar lifters. So the Cam needs to help. Note: I am assuming mild set up due to gt40 head selection. I suggest TFS upgrade kit. Quote from: boofhead on January 18,PM. Sure it will work - same as the one I have on my shelf. Note: You still need to upgrade the springs. Your right - it is the Chev version - I assumed Ford since this is what we have been discussing so I did not look that closely.

So the kit is no good to you.

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