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#1
01-06-2002, 09:51 PM
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PLANING ON SOME CHANGES WHILE THE SNOW IS ON THE GROND, THINKING ABOUT 1.65 ROCKERS ARE THE WORTH THE EFFORT, I AM RUNNIG A 60OVER 400 TRW FLAT TOPS CAST HEADS WITH A 320 DUR/488 LIFT CAM , WHAT DO YOU THINK
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#2
01-06-2002, 09:51 PM
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PLANING ON SOME CHANGES WHILE THE SNOW IS ON THE GROND, THINKING ABOUT 1.65 ROCKERS ARE THE WORTH THE EFFORT, I AM RUNNIG A 60OVER 400 TRW FLAT TOPS CAST HEADS WITH A 320 DUR/488 LIFT CAM , WHAT DO YOU THINK
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#3
01-06-2002, 10:04 PM
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If ya' want to realize more lift, it's ok & cheaper/easier than a cam change.
You'll have to elongate the slot in your heads to accomodate the increase movement. That will require removing the heads at the very least. 
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 SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY! |
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#4
01-06-2002, 11:35 PM
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If you have .488" lift with 1.5/1 rockers, a true 1.65 will give you. a 536" lift. A Harland Sharp may give you about a .560" lift, so be sure to check valve to piston clearance as well as elongating the push rod slots.
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Bill 64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs. 8.2550@164.17-1/4, 5.2901@131.97-1/8, 1.1981-60-ft. 8/10/08 
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#5
01-07-2002, 12:05 AM
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Are the 1.5 Harland Sharps more than 1.5 just like the 1.65's?
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_________________________ _________________________________ http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse" Sonny Barger ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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#6
01-07-2002, 12:08 AM
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Adding 1.65 rockers will add effective duration and act much like changing to a slightly larger camshaft. On the dyno I've witnessed 20-30hp increases with this modification alone. Besides checking pushrod clearance, you must make sure the valvesprings can handle the additional lift. You must also check valve seal to retainer clearance. It is also wise to check rocker arm to retainer clearance and do a quick check of the valvetrain geometry to see if longer pushrods are needed....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#7
01-07-2002, 10:10 AM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by 6567GTO:
Are the 1.5 Harland Sharps more than 1.5 just like the 1.65's?<HR></BLOCKQUOTE> Yes they are, I believe they end up being 1.55
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1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#8
01-07-2002, 01:17 PM
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What would be the indication that you needed longer push rods? How to check and determine length needed?
Phil
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"dreamed I was wide awake........woke up and I was sound asleep" |
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#9
01-07-2002, 02:13 PM
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If the rocker tip is not contacting the valve tip properly during the lift cycle. You can check by loosening a rocker and coloring the valve tip with felt marker. Then reset the rocker and run the assembly through the lift cycle a couple times. Loosen the rocker and check your pattern. It should be more or less centered on the tip. To much to either side indicates a need for longer/shorter pushrods depending.
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#10
01-07-2002, 09:39 PM
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sound like i might need to look for a better (biger)cam , what do you guys recommend ? this is a bracket racer t400 trans foot brake 4.22 gear 28x10.5 tires apox 3200 lb runs 7.70 1/8 mile shifting at 5200.leavving the line at 1800, might consider a converter upgrage i think more stall might help, thanks for the advise
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#11
01-08-2002, 03:01 PM
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WARPed - I'm using an Ultradtne 288/296 Hyd cam. The lift is .485/.507. What would the true lift be? What's the math equation look like?
Thanks
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_________________________ _________________________________ http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse" Sonny Barger ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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#12
01-08-2002, 04:37 PM
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To go from 1.5 to 1.65 multiply by 1.1 (SHort way)
Or go the long way.. divide your lift by 1.5 (current rocker ratio) to get the lobe lift. Then multiply by the new ratio.. 1.13 for 1.5 to 1.7 rockers (HS 1.65 rockers)
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William's Law-- There is no mechanical problem so difficult that it cannot be solved by brute strength and ignorance. Scott Schering Http://www.pontiacs.org |
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#13
01-08-2002, 09:32 PM
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Thanks Scott!
Phil
__________________
_________________________ _________________________________ http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse" Sonny Barger ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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