Hey fellas . Just a quick question . I'm doing a casual tear down on a 86 vette engine. And the spring retainers for the exhaust and I take valves seam different



Almost looks like a spacer . Is this a gm thing? Or after market ?

 

The exhaust valves get a lot hotter than intake valves. The retainer may include a rotator to help rotate the hot exhaust valve for better cooling and prevent hot spots on the seat.

 

Yup, that's the rotators. Useless dead weight in the worst possible place.

Throw em away. Put an extra .090" of shim under the exh springs.

The retainers themselves are the same on all.

Throw away those oil splash shields too. Use "positive" seals. Then none of that other deadweight is even excusable any more, let alone necessary.

 

I'm most likely to swap them out for the comp cam beehives when I upgrade the cam . As well as 1.6 roller rockers

 

That's certainly an option as well. In which case, you'd throw the rotators and splash shields in the trash, and shim the springs accordingly; which you'll find, the exh will take about .090" more than the int.

And of course you'll want to use positive seals.

IOW, nothing changes about the advice I gave.

 

I talked to comp cams today. They helped me pick out some gear . I got the loaded kit for the xe268h cam with a shim kit and the ultra pro mag 1.5 rockers . I hope this is going to work well.

 

What all did they spec out?

 

As for the car you mean?
86 5.7ltr flat tappet l98
l98 58cc ported to fel pro 1205 pocket polish
Full length headers no cats.
Ported intake man and ported as&m runners .
700r4 3.42 gear 2000 stall.
And a ton of other questions . It was a full day of phone calls and emails. I think they did there home work .

 

What did they spec for you?