[dt]

Anyone running a 20W50 weight oil using Morel 4603 lifters?? I know the recommended oil is 15W40 as per Straub, but my local builder is telling me to use VR1 20W50 because the Morels can be loud, which mine are. Only have a couple miles on rebuild though. Thx

 

[GRN69CHV]

Stay with 15-40 oil. No reason for 20-50 unless your bearing clearances are wrong. I found Morels needed as much as 1.5 turns preload to quiet down.

 

[dt]

Really 1.5 turns?? Whoa. I'm only at 3/4. Thx

 

[482 ZL1]

Use 15w 40 oil with 7/16 stud try one turn first,
It depends if you have alloy heads or not due to expansion

 

[aukai]

Check with Chris on the oil. If I'm not mistaken there was a post about viscosity, and the Morel lifter.

 

[dt]

Thanks guys, I think the recommended oil as per Chris is a 15W40. I was just wondering if anyone was running a 20W50? The 15W40 Delo is what most guys are using I believe??

 

[fast582]

I have been running 20w50 vr1 racing oil in my motor for 2 years now with 4603 morels just ran 6900 rpm this weekend at track with out any problems ... i quess i got lucky i didnt know about having to use 15w40 !!! And thanks to Chris Staub for the great valve springs they work awesome !!!

 

[dt]

Are your 4603's noisy ??? My local builder told me to use 20W50. I didn't think it would be a problem. Noisy at start-up??

 

[fast582]

Mine are not bad can hear them slighty with hood open at idle when hot i have them adjusted at 3/4 turns

 

[dt]

Thanks Sam. Mine are at 3/4 also. Just have to put miles on them now.

 

[496blaze]

Mine are horrible when cold and barely acceptable once warm. I hate the noise..

 

[OLDED]

Mine are real noisy at start up and eventually quiet donn a lot when hot. The forged pistons are a bit noisy too but settle in about the same time as the Morels do. Set at 1 1/4 turns and 10/40 Syn. Blend oil.

 

[Slick71ss]

Running 10w30 and 1.25 turns preload on mine. I haven't noticed them being loud.

 

[cv67]

Know when you can tell you are getting old?

 

[bracketchev1221]

I have run 20/50 Castrol GTX with mine. They were noisy at startup and quiet down when hot. I'm not worried about it. I switched to the Rotella 15/40 only because I was running it in the Chevelle and that is a solid roller. So now I use it in all 3 cars.

 

[cstraub]

Morel hyd roller are not to be run with 20W-50. MOrel made a lifter that was specific for that oil and has since discontinued it. Nothing higher that 15 on first number and nothing higher than 40 on second.

 

[dt]

Thanks everyone. I will try the Brad Penn 15W40 semi-synthetic.

 

[427L88]

Go to Wally world and buy the Delo. Its a great oil, at a good price and you dont need the flat tappet wear additives Brad Penn oil has. I use the Brad Penn for the Chevelle's solid flat tappets. I didnt know they made a 15-40, else I would have got a case of that instead of the 10-40. Your Morels dont need all that ZDDP. Delo has a-plenty anyhow.

 

[dt]

Thx Gene.

 

[blue66]

I use a 5-40 synthetic with the street morels past their reccomended limits....
244/248 @ .050 and .630" lift. Never heard or had a complaint about lifter noise.