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Topic Review (Newest First)
07-30-2014 07:09 AM
ap72 I always run the lash tighter than called for- it increases your actual seat duration slightly but it also quiets it up a lot. You can get cams ground with a "tight lash" opening ramp, needing as little as .010-.015" lash. The tighter it is the quieter it is- go too tight and you backfire or burn a valve seat.
07-30-2014 06:04 AM
MouseFink Two cam lobes going flat.
07-29-2014 07:09 PM
Originally Posted by F-BIRD'88 View Post
Poly loc came loose. Not locked right. -(method)
I hope that's it..Cause it was locked tight when I went to reset them..I hope its not bad lifters..Its #8 ex and #6 in and they were WAY off...
07-29-2014 06:51 PM
Dajerseyrat What would cause only 2 of the valve lash's to be extremely off within a few miles of driving? Bad Poly lock?
07-29-2014 11:45 AM
MouseFink I had a 1965 Chevrolet 30-30 camshaft in my 1959 Chevy Impala with a 1965 327 engine and it was a daily driver. I installed a new over-the-counter 1965 327 CI short block in my Impala. When I installed the new engine, I initially set the valve lash at .030" intake and exhaust and checked the lash again about four months later and the lash was still .030". I checked the lash two years later just before I sold the car and the lash was still 030" . The engine had Joe Mondello prepared 461 heads, slightly used Crane valve springs set up with 100 lb. seat pressure at 1.700" and 290 lb. open pressure at .485" lift using 3/8" screwed-in rocker studs. I was also using stock rocker arms. The screw-in studs kept the lash at .030".
07-29-2014 10:42 AM
BuzzLOL . Yeah, in an occasionally driven mild street car, lash may only need re-adjusting every 10 years or so...
07-29-2014 09:07 AM
Originally Posted by F-BIRD'88 View Post
The Scorpion roller rockers are much quieter than others I have heard.
Even with solid cams.
I used Harland Sharp roller rocker arms in two 455 Pontiac engines and they were knockers. In an attempt to eliminate valve train noise, I replaced the Comp Cams so-called "anti-pump up" lifters in both engines with now discontinued Melling JB-951R limited travel lifters (Ram Air IV) and set the lifter preload at .005". That quieted the lifter noise considerably. However, no adjustment I made could eliminate the roller rocker arm noise. I will never use roller tip or full roller rocker arms again unless the valve lift exceeds .550" and valve spring open load is in excess of 350 lb. and that is not going to be likely.A camshaft with those specification eliminates the use of roller tip rocker arms.
07-28-2014 02:16 PM
MouseFink Roller rocker arms are more noisy by design than stock GM type steel ball fulcrum rockers. I chased valve train noise for a year before I was told to take a look at the roller rockers.
07-28-2014 01:11 PM
Dajerseyrat I just got my solid roller fired up and after a bit of driving about 4 of the valves were way off. mos others were close or within spec. It does sound like something is wrong with the car to an untrained ear...Like a tickity tickity sound..
03-28-2008 03:14 PM
68NovaSS I'm running a Lunati solid roller with .590 lift, I pulled the covers twice, a month apart, had one needing adjustment, and it was fat from the start. I ran it on the street all last summer, no adjustments were needed. Just checked getting ready for summer...all good.
03-28-2008 03:02 PM
cope its a .550 lift

Bowtie man In it a sweet sound!!!!
what i like is that most people are going to be like dang there is someting wrong with that car but the gearheads are going to be like man that sounds good
03-28-2008 02:53 PM
Originally Posted by cope
how offtin should i adjust them i was told every oil change and i do it while the engine is hot. this is my first soild cam
I had a .660 lift solid roller in a race car and pulled the covers off about 6 weekends in a row. It needed adjusting only the first 2 and after pulling them for the next 4 weekends and not needing any adjustment, I ran the car for about a month and it still didn't need anything. The car always ran the number so I quit pulling the covers off. At the end of the season, they were only .002 off. It just depends on how aggressive your cam is and how good the rockers hold. A buddy used the same brand rockers I did but ran a 610 lift flat tappet and couldn't keep it adjusted at all. It backed off on every single freaking pass. New set of locks or rockers didn't help....
03-28-2008 02:46 PM
Bowtie man In it a sweet sound!!!!
03-28-2008 02:41 PM
cope how offtin should i adjust them i was told every oil change and i do it while the engine is hot. this is my first soild cam
03-28-2008 02:24 PM
Holder350 solid rollers are abit noiser than a hyd one.........

however they require constant relashing of the valves.

and that may be your problem. a higher lash will make more noise.
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