Don Terrill’s Speed-Talk

I single plane Holley street dominator may fit , plus work better in terms of top end if you or the owner can turn one up.

Make sure the valves have a break ( rounded edges) from the chamber face to the start of the seat, especially the Exh valve as these can make for detonation.
Don't ask me how I know this!
Also on the Exh side floor of your chamber I see a sharp machine edge left just before the seat incert.

You mean 77319?

How big a motor are talking and what peak rpm?

I am surprised how strong they are, as so far in my Brothers SB Vett they are handling 7000 rpm and 525 hp!

If on a 23 degree Head the valve inclination angle was shifted to 21 degrees I don't think you would be able to cut or grind a valve seat back into the chamber!

The trick flows may be 10 CCs smaller , but by there flow numbers they more a good amount more air in the all important .300" to .400" lift range. If you get them and do not have a flow bench to guide your porting rework then I would not touch a thing about them! Getting fat flow numbers d...

Like I posted AFR drop ships them for Jegs in 2 days!

Jegs shows AFR can ship them in 2 days.

In regards to a buddy's Pontiac motor using that brand riviera there 1.65 rocker checks in at more like 1.78 and needs a far longer push rod then Harland sharp brand 1.65 rockers that check in at 1.72.

So......... what are the details to that!

Gentle lobe?
Ti hollow stem valves?
Valve lifts under .550"?

Are we talking about what the manufacturer wants them set at, or what your seing in use?

Aluminum heads will expand enough when hot to add .004" to a cold lash setting so when I set mine cold I back out that .004".

Talk to total and see what they say.
Onething for sure I would not run a non plasma Moly face ring like a common cast Hastings but for maybe the serving groove!

.025" off from being dead on would not worry me!

I hope we are talking about Titainium valves here because 200 on the seat does not even sound like enough for a 1.60" steel valve at over 8000 rpm if you have aagressive lobe!