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Rono
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Group: Forum Members
Last Active: Last Year
Posts: 1.3K,
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Anyone have a recommendation for setting the valve lash on roller rockers with a Comp Cam that has a .389 lift? I readjusted them when I installed my new distributor and set the intake at .012 and the exhaust at .014 but I think I may have some too tight. That was on the recommendation of Comp Cams. The car runs fine when cool, after running for about 20 minutes on the road, the idle becomes erratic. Think it may be a valve set too tight. I plan on re-checking them all, but wanted to know if I should increase the gap.
Thanks,
Rono
 Ron Lane, Meridian, ID
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Rono
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Group: Forum Members
Last Active: Last Year
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Correction on the valve lift. Gross valve lift is .489. Cam card says lash should be .012 Intake and .014 exhaust. Rono
Ron Lane, Meridian, ID
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62bigwindow
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Group: Forum Members
Last Active: Last Year
Posts: 884,
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My cam has .475 lift and Oregon cams recommends .022 on valve lash.
Durham Missouri
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charliemccraney
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Group: Moderators
Last Active: Yesterday
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Valve lash can be used to tune, so you can vary somewhat from the manufacturers specification. However, if that is the clearance that Comp suggests for their own cam, then that is where you want to start and you don't want to deviate too far from it. It's easy enough to test your theory. Pull the valve covers when the problem exists and see if the lash has tightened up on any valves.
Lawrenceville, GA
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Rono
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Group: Forum Members
Last Active: Last Year
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Thanks guys for the response. So generally speaking, is the lash reduced for roller over standard rockers rockers because of the reduced friction or is it strictly dependent on the cam grind? Thanks, Rono
Ron Lane, Meridian, ID
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YBLOCKEREDH
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Group: Forum Members
Last Active: 7 Years Ago
Posts: 80,
Visits: 47.9K
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I have a question concerning the new stainless fuel lines from the pump through the glass filter bowl ending at the carb on my 57 stock bird. All fittings are original brass and appear to look fine at the flair. They all leak badly . I've tried snug and tight tight finally removed and used rubber line with clamps. Very frustrating...am I doing something wrong? The lines were purchased new from Concourse in Carson,NV.
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charliemccraney
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Group: Moderators
Last Active: Yesterday
Posts: 6.1K,
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YBLOCKEREDH, start a new thread for your fuel line issue. The ratio of the rockers will not have any significant affect. It's probably more complicated, but simple math and an assumption that Comp use a 1.5 ratio rocker in their specs indicates about .001" difference between 1.5 and 1.6 ratio for the same lobe lift. The difference between low ratio 1.43s and 1.6 rollers is 5 ten thousandths of lobe lift for the same lash. That shrinks to about 3 ten thousandths for 1.54s. Again, this is an easy theory to put to the test, and well within reason for fine tuning..
Lawrenceville, GA
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paul2748
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Group: Forum Members
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Your problem is similar to what I had with valve reversion. The exhaust valves pound down into the head (non-hardened seats) and the clearances close up. Rough idle when hot.
Try a little more clearance and see if that helps.
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ
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slumlord444
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Group: Forum Members
Last Active: 4 Months Ago
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I had similar leaking problems with stainless lines. Had to really crank down and get them really tight so as to not leak. My guess is that the stainless lines are harder and require more pressure to compress and seal properly.
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62bigwindow
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Group: Forum Members
Last Active: Last Year
Posts: 884,
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Forgive my ignorance but what is valve reversion?
Durham Missouri
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