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#1
07-13-2005, 11:25 AM
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Has anyone run into valve tip geometry problems when going from stock rockers to the Harland sharp?When I switched rockers ,valve guide wear was inhanced ,tip indicated wear pattern to run center of tip at valve closed to outbd edge of tip at full valve open,I know this in not accepted.Pulled heads installed longer Ferra valves + .100 bronze guides.Pattern on valve tip was almost perfect but still favoring outbd of valve tip at half lift,installed Crower solid lifters that sit .070 deeper than stock,rechecked tip pattern and results was perfect contact inbd of center at valve closed,dead center at half lift and mirror image of inbd but to the outbd at full lift.
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#2
07-13-2005, 11:37 AM
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FWIW
My 1.5's that I just got a few weeks ago measured at 1.61 when on the motor. My 1.65's that I got 10 years ago measured 1.74 ont he same motor.
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************************************* 463 SRP .035 Pistons, Eagle rods, N crank, Pump gas, Victor intake, Holley 850BT carb, 6H heads,TH400 w/T-Break, Continental custom 3500 converter, 3.73 gears. TV7101 TURBO! 
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#3
07-13-2005, 12:06 PM
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My HS have always given the same pattern as stock rockers and the same pushrod length for me. My 1,5s are around 1.52 and the 1.65s 1.7-1.72.
But each rocker may need a specific pushrod length for the perfect pattern.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#4
07-13-2005, 12:25 PM
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Did you you check for push rod length? I ended up with 9.100 Hi-teks with shaved 16's HS 1.5 rockers...I've heard it said HS 1.5s come in at 1.6 with most builds.
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#5
07-13-2005, 03:19 PM
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Never measured the rockers (or the pushrods for that matter) on one engine I had and cranking it over by hand would always locked up on one piston. Switched to Crane rockers of the same ratio and problem went away.
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. Mark S . Who needs nice and pretty, when you can have mean and nasty? KRE Aluminum headed 463CID 73 LeMans. Used to run 10.6x @ 124.55. 3700lbs . So much for 2020...shootin for 9s in 2021...and in 2022 apparently.....looks like 2023 as well. >>My 73 Build thread |
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