Fits Factory Heads, no machining required.
High Lift Valve Spring Kit for SB FORD GT40
Application: Hydraulic Roller, up to .560" Lift
Fitment: GT40 302 heads (we also offer kits for GT40P 302 heads, check our other ads)
Late model 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.
They normally have .393" tip length intakes and .495" tip length exhausts.
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 two different sets of retainers, eight intake retainers and eight exhaust retainers.
The performance springs in this kit fit GT40 heads without additional modifications.
Designed for mild to moderate high performance Hydraulic Roller cams, our kit will handle most cams up to around 234 degrees duration @ .050".
If you need help determining if these will work with your cam, just send us an e-mail with the cam specs or better yet, the cam brand & part number and a link to the specification page. We'd be happy to verify compatibility.
Works great with many of today's popular performance cams.
Suitable for 1.6 and 1.7 ratio rocker arms as long as the lift does not exceed .560".
PARTS UPDATE- NEW ITEM Just in- Oversize length GT40P, GT40 & E7 Pushrods w/ 6.315" length. Enter 6.315" into search engine for details! (not included w/ spring kit)
Our GT40 kit is the finest drop in spring kits available anywhere.
Excellent valve control w/ High Performance cams up to 232 degrees duration @ .050".
Applications with larger cams should consider our "Max Output" drop in valve spring kits. Also available under the valve spring category.
For specifications on Max Output spring kits, check our other spring kit advertisements.
Requirements- Measure valve spring height during installation. For more information on setting up valve spring installed height, read the information we has available under the "Valve Spring Shims" category.
Buyer can add: Shims, Seals or a valve spring height micrometer by checking the boxes at the right of the pictures. These items are added in at slightly discounted prices with reduced shipping rates. Although we also offer std shims, we recommend using hardened shims with this kit.
Not to be confused w/ early 351w GT40 engines. Early 351W GT40 heads normally use .393" tip length valves on both. We also carry kits for 351W GT40. Kits for SBF w/ .393" valve will suit GT40 351W.
*Note: We purchase our GT40/GT40P valve springs in large batches, usually 5000 pieces at a time. Although we order the same part number, with each batch comes some variation in lift range and/or installed height. We try to keep the specifications listed current which is why the max lift can vary from time to time. Sometimes the batch will offer a higher lift range while other times they will be less. Variation is common between production runs, even the same part number from the exact same manufacturer. The current batch of springs have a .560" max lift limit. If you have an application which needs a higher lift limit, feel free to contact us to check availability as we probably have them available. Yes, the higher lift springs will cost a little more.
Alex's Parts- The smart choice in valve train parts~