On some Early small block Olds heads (casting # 1, 2, 3, 4 & some 5) the installed spring height is very short, usually 1.600″, and in many cases the spring seats need to be machined up to .090″ to achieve proper installed spring height. This may also happen on some Olds big block heads #A, B & C. The Olds small block 7 and 7A heads and some big block “G” heads usually are 1/2 deep & 1/2 shallow. If so, specify or machine heads to all deep spring seats.
(Shallow spring seat heads do not have valve spring rotators while deep spring seat heads do. Be sure to check your heads closely.)
Silicon-vanadium outer and inner valve springs. Chrome moly retainers and heat-treated valve keepers. Double spring – no dampener. Use with camshaft JM-18-20 or larger. Big block Olds casting #’s D-DA-E-G-H-J-K-F and small block 6-8-3A-4A-5A and some 7-7A heads. Set of 16.(When ordering spring kits please specify shallow or deep seats on the billing page in the “Comments” section. All engines with rotator valve spring retainers are deep spring seat heads.)
Silicon-vanadium outer and inner valve springs. Chrome moly retainers and heat-treated valve keepers. Double spring – no dampener. Use with camshaft JM-18-20 or larger. Big block Olds casting #’s A-B-C-CA and small block #’s 1-2-3-4-5 and some 7-7A heads. Set of 16. Note: Shallow spring seat heads do not have valve spring rotators while deep spring seat heads do.
Silicon-vanadium valve spring. Fits all (stock valve seals) and deep spring seat heads #D-DA-E-F-G-H-J-K big block and all 6-8-3A-4A-5A and some 7 & 7A small blocks. Heavy-duty, single-type spring with flat wound harmonic dampener. Kit includes chrome moly steel retainers and heat-treated steel valve keepers. Will accept up to .600″ cam lift, has 1.800″ installed height and 125 lbs of spring tension. Recommended for any stock cam and Mondello up to JM-22-25 grind only. Can be installed at 1.75″ giving 140 lbs of seat tension and will take up to .550″ lift. Set of 16.
Similar to SK-245-D but will fit shallow spring seat heads with casting #’s A-B-C-CA big block and 1-2-3-4-5-6 and some 7 & 7A small block. Will accept up to .500″ cam lift, has 1.700″ installed height and 125 lbs of spring tension. Set of 16. Recommended for any Mondello cam up to JM-16-18. Use SK-240-S or SK-247-SP spring kit with our larger camshafts.
Silicon-vanadium steel outer valve spring with flat wound harmonic dampener designed for cams up to our JM-22-25 while using stock type umbrella valve seals. Installed height is 1.700″, seat pressure is 130 lbs at .530″ lift. 320 lbs open pressure. The spring coil binds at 1.100″. (Use SK-240-S or -D for racing engines.) This kit is for shallow spring seat heads (big block A-B-C & CA and small block 1-2-3-4-5 and some 7 & 7A heads) and it allows you to run up to a JM-22-25 camshaft.
This kit is designed for cylinder heads with half deep and half shallow spring seats. This kit works with all Mondello hydraulic camshafts including roller hydraulic and mechanical flat tappet camshafts with lifts up to .650″ with no coil bind problems. You must use a small type positive Teflon valve seal like our VS-650 or VS-660 to clear the inner valve spring. Kit includes 16 springs, chrome moly spring retainers and heat treated steel valve keepers. (Includes 8 springs from the SK-245-D and 8 springs from the SK-247-SP spring kits.)
This kit is designed for cylinder heads with half deep and half shallow spring seats. This kit works with all Mondello hydraulic and mechanical non-roller camshafts up to a .540″ lift. You can use any valve seal with this spring kit. Kit includes 16 springs, chrome moly spring retainers and heat treated steel valve keepers. (Includes 8 springs from the SK-245-D and 8 springs from the SK-247-SP spring kits.)
Street/strip camshaft spring, designed for mechanical roller cams with no more than .608″ lift. This spring installs at 1.800″ installed height, will take .640″ lift and is good for 6,500 RPM. Kit includes springs, chrome moly retainers & heat treated valve locks. At 1.800″, 210 lbs. on the seat and .640″ lift with 510 lbs. open pressure. 1.540″ outer diameter.
Silicon-vanadium stock replacement valve spring with harmonic dampener. Works with rotator or non-rotator valve spring retainers. Installed height 1.687″ with 125 lbs seat tension. Will work with any stock-type camshaft up to .500″ valve lift. Recommended with up to Mondello JM-16-18 hydraulic camshaft at .500″ cam lift, 255 lbs open tension and .600″ cam lift before coil bind. You can use any of our chrome moly retainers for this spring: CR-300, 310, 320. Works with stock valve seal. Replacement springs for our SK-245-S spring kit.
Silicon-vanadium, heavy duty valve spring with harmonic dampener. Use with stock steel retainer or any Mondello chrome moly retainer: CR-300, 310, 320. Installed height 1.800″ with 125 lbs seat tension, .500″ cam lift with 265 lbs tension, .600″ cam lift with 305 lbs open tension. Recommended with any stock cam or up to Mondello JM-22-25 camshaft. Springs can be set at 1.750″ for shallow spring seat heads using our CR-320 retainers. works with stock valve seal. Replacement springs for our SK-245-D spring kit.