Re: Lifter Clatter After Warm Up
Rhoads lifters are ALWAYS NOISEY BY DESIGN after the motor/oil warms up .
That's becasue they have faster bleed rates to lower the cam duration/lift a little at idle & lower engine speed,then as rpm increase the higher oil pressure overcomes the faster bleed rate and then the full duration/lift is restoerd fr full perfornamce.
These fast bleed/variable duration lifters are designed to be used in motors with lrg cams so they bleed down a little at idle & lower engine speeds when oil pressure is lower (esp when hot) to effectively lower duration a few deg to smooth out the motor some & increase the int vacuum a little too.
If your running lighter oil like 10w-30 in the new motor you could try some 15w-40 chevron delo or even Valvoline VR1 or NSL 20w-50 if the motor has clearances to handle the thcker 20w-50 oil and sometimes that will quiet the fast beeld lifters down a little bit but dont expect miriclas,they are noisy lifters even with heavier oil.
But as already stated an aggresive cam lobe profile can aslo add to your noisey valvetrain making it even worse.
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
2009 HD ELECTRAGLIDE CLASSIC ULTRA (GOT 11/14 W-9,700 miles)