Iroc57

We had a thread discussing the need for the zinc on larger cam flat tappet engines a while back. I was running rotella t 15-40 on my 454 and now I am going to try the valvoline 20-50 racing oil. I just adjusted my lifters again and have accepted the fact that the ebay rebuild that I bought is just a loose engine (oil pressure drops when warm and it is a bit noisy) hence the 20-50.

My question is:
The rotella smells burnt. I have the temp under control now but do any of you know of a synthetic that will give me what I need for the comp Xtreme 268H grind? I was thinking that the syn will not break down as easily.

I know another oil thread but this is an uncommon situation

Your thoughts?

jaa1992

I think the Mobil 1 15w-50w has what we need. Its what I run in my 92.

IIRC there was a thread in the Autocross section about the Mobil 1 formulations.

rklessdriver

Gibbs has a syn oil that will fit the bill for you.

http://www.joegibbsracingoil.com/hotrod/index.html

Mobil One drastically reduced the amount of Zinc in it's oils nearly 8yrs ago. They did have a good syn oil up till then.... It had a "Red Cap". The newer oil with the gold or silver cap is not recommended for a flat tappet camshaft.

Will

JackDidley

Jegs sells Manhattan oil zinc +. Its a zinc additive. Maybe that will do what you need. Seems like once the cam is broken in you should not need it.

Iroc57

\

We probably don't have the same engine

Iroc57

There was a disclaimer in an article excluding high lift camshafts. The problem with the Xtreme grind for the big block is the fast ramp. The short duration gives me a good idle but is tough on the lifter from what I can tell.

Iroc57

We may have a winner

Thanks

jaa1992

We don't but the thread in the Ax section mentioned the 15w-50 formulation still had the high zinc level. There was also talk about a couple other racing formulations that may help.

l98tpi

I run Royal Purple, but am not familiar with your situation. I am surprised you purchased an engine off ebay. Good Luck.

Iroc57

I'll check it out

Thanks

383vett

A lot of bracket racers I know running flat tappet cams run Brad Penn oil. http://www.bradpennracing.com/

Iroc57