Thread:

Valves, who's to run?

Ok here's my delima I bought a new set of bare heads and I need to put valves in them.

I've looked at Manleys and they use the same part number for their severe and extreme duty intakes which are a NK-844 material, their extreme duty exhaust is XH-432 material which is supposed to be quite a bit better than their severe duty which is a XH-428 material.

To confuse myself even more I've looked at Ferrea competition plus super flo series which are supposed to be great.

I've used Manley and SI before and never had a problem with either of them but I'm open for ideas. I'm using these on a NA engine for my flat that will see some rpm (7500ish +/-) and might have a decent roller cam this time around so what brands are holding up the best and have good quality these days?

Thanks,
Loren

Running Fererra inconel ex, and Rev's SS intake.

Rev or Ferrea, or Victory or DelWest for Ti. Not really a big fan of Manleys any more.

Originally Posted by steelcomp

Rev or Ferrea, or Victory or DelWest for Ti. Not really a big fan of Manleys any more.

Originally Posted by wagspe208

I'm a Ferrea fan. REV too. Either will be just fine. You ain't thrashing them 10k are you?
Run em and smile.
Ferrea sounds like Ferrari, so they are fast. REV sounds like its revven high, so they rock too. Manley's are not.
Wags

Manley's aren't good anymore huh?

So between Ferrea & Rev which is better?

I didn't see a listing in Rev for much of a tulip shape:
Exh CL1708 5.450" 12*x1/2" Both are 12 degree but this one has a 1/2" radius
Exh CL1713 5.425" 12*x3/8"


Then Ferrea has these that might work for the exhaust:
Exh F1206P 15* super flo +.100 5.500
Exh F1201P 15* super flo +.100 5.425
Exh F1271P 22* super flo GM/Edel 5.450 light weight

REV or Ferrea. Not sure you need to go all the way to the iconel, or Ferrea super alloy on the exhaust. The next step down, top SS valve in either brand is a damn good exhaust valve for all but the most brutal boat engines. Turbo, or blown, maybe chit load of NOS, or long extend WOT and you need the best. For a N/A in a small recreational boat that sees flat foot for seconds, its little bit over kill unless you just happen to have the money laying around. In that case, send it to me.

If you want a tulip, buy the AFR ex valve for those heads. It's a 30* tuip and I think SSS makes their valves...or maybe SI. It's all the same stuff.
You're splittin hairs again.

Originally Posted by Carnivalride

Manley's aren't good anymore huh?

So between Ferrea & Rev which is better?

I didn't see a listing in Rev for much of a tulip shape:
Exh CL1708 5.450" 12*x1/2" Both are 12 degree but this one has a 1/2" radius
Exh CL1713 5.425" 12*x3/8"


Then Ferrea has these that might work for the exhaust:
Exh F1206P 15* super flo +.100 5.500
Exh F1201P 15* super flo +.100 5.425
Exh F1271P 22* super flo GM/Edel 5.450 light weight

Originally Posted by steelcomp

If you want a tulip, buy the AFR ex valve for those heads. It's a 30* tuip and I think SSS makes their valves...or maybe SI. It's all the same stuff.
You're splittin hairs again.

Seems like somebody else around here splits hairs, thanks for the info though!

Originally Posted by steelcomp

OK...I was able to get these done today with some help from AFR. They were kind enough to send me some tuliped ex valves that are usually worth some extra exhaust flow. Loren, here's your comparison, just for you.
The results...

Here's the final numbers:

Re-test exhaust, final chamber blend, nail head valve vs. tulip:

Nail head / AFR tulip
.2 133 / 134.6
.3 177.5 / 180.7
.4 220.3 / 227.9
.5 253.6 / 262.5
.6 270.7 / 275.1
.7 277.7 / 279
.8 281.8 / 281.8

Thanks again to AFR for going beyond good customer service.

Originally Posted by wagspe208

Manleys have had runout issues for years out of the box.
Ferrea has not. Material wise... well, who gives a damn if I can't check em and run em.
Wags

Thanks, what about Rev?

Used REV's in my new motor

Originally Posted by nelson#109

why dont you like manleys anymore????

X2 what Wags said (but I face all new valves anyway), but mostly because they run their seats and margins too thin. Don't give a guy anything to work with.

Originally Posted by Carnivalride

Seems like somebody else around here splits hairs, thanks for the info though!

I backed myself into that corner..I had to make a set of heads match a cam. You don't have to do that. You have the CNC chambers and you should have plenty of exhaust flow for what you want to build even with a nail head valve. Get the cam ground for the flow numbers and go play.