![]() (11) Good torque and power up to 6500 RPM. (10) Good torque and power up to 6200 RPM. (8) Emissions legal with 5-speed manual trans. Can somebody help me,I want to install a new set of heads on my 1993 Lx,GT40X305 heads and a E303 cam,I know that other members. (7) Hi-Stall torque converter recommended for automatic trans. (4) May require piston modification for piston-to-valve clearance. (2) Also fits 1994-97 351W with factory roller cam when used with mass air EFI. (1) On EFI engines, performance camshafts work only with mass air induction systems. For comparison purposes, add intake and exhaust lobe centers and divide by 2 to calculate "camshaft centerline" specification for Ford Racing camshafts. This is useful to check the cam with a degree wheel during installation. The duration figures in the shaded area are taken at 0.050" tappet lift. E303 cam, 1.7 roller rockers, gt40P heads, trickflow valve springs, comp cams timing set, gt40 upper and lower intake. Even if it pulls 6500 all day, you would go faster shifting around 5500. The E cam really does run out of steam by 52-5300. That is achieved by having valvesprings that are overly stiff for the application. NOTE: Camshaft intake and exhaust valve events are measured at 0.050" tappet lift. an E cam will pull to 6500 all day sounds like bad corresponding parts ANY cam will pull 6500 all day. Avoid the 1.7 rockers on a hydraulic roller cam unless it is a low lift,non aggressive profile.Hydraulic roller cams are nice,but they have limits.A profile such as the one you mentioned requires substantial spring pressures to avoid valvetrain separation(float)at higher rpms.Hydraulic lifters will bleed off under these circumstances(although cam manufacturers don't want to talk about this)and valve timing variations will result and you'll have no way of detecting this.Any 5.0 dyno test you read will limit rpm to 6000-6200 for this reason,even if the head, cam,combination is capable of producing more power at a higher rpm.Hydraulic roller lifters are very heavy,and combined with aggressive lobe profiles,high valve spring pressures,this can overwhelm the hydraulic capability of the lifter.Using a 1.7 rocker amplifies all of these limitations and makes for a very unstable valvetrain.This is especially true of hydraulic roller retrofits,since they have a smaller base circle and make the lobe profile even more aggressive.Do the machine work for valve/piston clearance and try a solid roller cam & lifters.This eliminates all these limitations,will rev far beyond anything else,and make more power through the whole rpm range,and improve idle quality and vacuum.OPEN CLOSE OPEN CLOSE INT. ![]()
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