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#1
03-13-2014, 12:51 PM
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how much valve lash for this solid roller?
A used solid roller and companion lifters is on its way to me from a friend. He doesn't recall the lash it used. Can somebody give me the lash range one can use on the following used cam ? ( 1500 miles of use w/ ~ 20 passes @ the strip) :
Comp Cams special grind solid roller 285/291 @ .015 248/254 @ .050 112 LS inst@108 gross VL= 577/583 I plan on installing it on 110 or 112 ICL Thanks |
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#2
03-13-2014, 04:12 PM
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There is a pretty similar SBC shelf cam. The suggested lash on it is .016/.018.
Start there, then test lashes up & down from there to find where you motor runs best. I'd do intake first. Then once the best intake lash is found, start testing on the exhaust.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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#3
03-13-2014, 04:57 PM
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Just a thought call Comp cams.
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461 Stroker: 265/276 Comp Cam Solid roller . 340CFM E-Head Victor Intake 1050 Dom Carb. 390/430 9" Gears with a T400 trans 4200 converter. Street weight 3850. 1.49 60ft. 275/60/15 M/T DR 10.57 SO FAR |
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#4
03-13-2014, 11:03 PM
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lash & lift
Quote:
depending on what pistons you have or if they have been worked, you could have enough piston to valve clearance.
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"Chief" Knucklehead 462 E Heads Solid Roller 91 Octane Nash Stick |
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#5
03-13-2014, 11:09 PM
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Most cam companies keep work order for custom grinds so a call to C/C ought to get you the correct lash. I have a Pontiac roller cam from Crower that I bought used and found out the lash settings from calling them years ago.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#6
03-14-2014, 02:07 AM
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Six out of the seven cam cards I have on hand for Comp solid rollers listed 18/20, and I thought I was going to be able to report a clean sweep. Then looked up the seventh and Comp listed 16/18. Oh well...
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#7
03-14-2014, 02:21 AM
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The lash is determined by the lash take up ramp designed into the lobe. Some are as little as .016" and some are as much as .030". It is important to know what it is designed for before you go experimenting too much. You can vary some from what it's designed for, but if you get too far outside it's parameters, you can ruin your cam.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#8
03-14-2014, 06:30 AM
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This is a question for the folks who ground the camshaft. Varying from where it is supposed to run can have pretty significant effects on how the engine runs as it changes the actual opening and closing points of the valves, in addition to being hard on the lobes as Paul mentions above......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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#9
03-14-2014, 07:23 AM
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In the end you need to check your lash with the motor hot after a run.
If you have aluminum heads you will find the lash opening up some .006" to .008". Taking this into account will let you set the lash with the motor cold.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#10
03-14-2014, 11:25 AM
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I'll suggest they are Comp XE lobes 4875-B and 4876-B
The 'B' lobes typically have 0.001" additional lobe lift, here it will be .3850" & .3890". Also the seat or advertised duration on the intake will typically vary by one degree less. Here 285 degrees at 0.015" instead of 286 in the catalog. The cam card should suggest 0.016" lash.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#11
03-14-2014, 04:32 PM
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On the back of the cam the lobe #s are generally etched and you can look them up from that, or the ID # and Comp can tell you.
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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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