My90Iroc

iTrader: (26)

Someone around here has bare Patriot Performance stage II heads that are setup for 2.02/1.57 valves.
I was wondering what's necessary and is it worth it to set them up with bigger (2.055/1.60) valves?
Do the bowls need work and would I need different parts (springs, retainers, etc) between the 2 different valve combinations?
Thanks in advance.

BrentB@TEA

new valves and valve seats. You should also blend the valve job into the port.

2001 Pewter WS6

iTrader: (43)

How much does that cost?

ssheets

iTrader: (1)

Fom what I've gathered 2.05' will require new seats. That means machine work to install the new seats and then a valve job of course. I know that's the case with stock seats, (they can be machined to 2.04") I assume PP is using the stock seats, but don't know for sure???
And, .003" is not going to do much for performance on a stock displacement motor, it may even loose a little low end port velocity. If you're going for top end it will help a bit.

I'm in the same boat trying to decide if it's worth the extra work for a few more thousands of an inch of valve. (.003 x 3.414)

ssheets

iTrader: (1)

Valves and seats will be about $300-($1500 if you want titanium )

BrentB@TEA

valves are 240 for a set of Ferreas, seats are not to much to but but we chage 240.00 to install all 16.

ssheets

iTrader: (1)

$480 for .003" more valve...anybody want to guess at performance gains?

Now I bought stock 5.3s for donors so I need new valves anyway,my good freind will do the machine work for the new seats so I just need to pay for the seats and to have them cryo-set in place.

Personally, I'm thinking 2.05"s may be worth it just because almost everybody has 2.02"s And the more you build the motor the more the larger valves will help.

BrentB@TEA

well I would say 240 for more seats. since most people opt for aftermarket valves anyways. I love the 2.055 intake valve option for a heads and cam car but prefer to keep the stock exhaust valve. However we have had very good luck with a 2.02 on our new port.

ssheets

iTrader: (1)

Wouldn't that be an increase of ~0.11949 of curtain area and will that help low end by giving more flow instantaneously or will it hurt port velocty down low?

I know the porting work will dictate much of this too, but just curious what your opinion is.

BrentB@TEA

BTW its .035" difference not .003 I would say a .035" difference in valve size would make more of a difference than .035 in bore size JMO.

ssheets

iTrader: (1)

Yeah, I noticed I slipped an extra 0 in there...I wish they would do that with my paycheck


But, like I also said it's the 0.11949 increase in curtain area that will make the difference. The valve diameter times pi... the curtain area is where the air flows into the chamber so your gains are really diameter incrase times 3.414.

BrentB@TEA

your math is wrong
It has never been my strong suit. However pi is 3.14

ssheets

iTrader: (1)

OOPs, I got my electrical formula mixed up with my cake and pi. In electrical you use the square root of 2 and 3 for different calcs. the square root of 2 is 1.414 and of course we all know hte square root of 3 is 1.7320508075688772935274463415059

Math error aside, it is the curtain where air flows across the valve, just as elctricity flows on the outside of a wire, know as "skin effect"

I'll try and check my math from know on

2001 Pewter WS6

iTrader: (43)

How much of a difference would it be on a 408 from a 2.02 to a 2.055?

ssheets

iTrader: (1)

The bigger the engine, the more air it needs. It's hard to quantify (especially with my math ) but on a 408 I'd think about 2.08" intakes.

I'm no expert, that's why I'm here asking questions for my H/C swap too, but I do know a few things...now if I could just remember what they were???

BrentB@TEA

2.08 on a 4.08..also open up the chamber (unshrouding the valves)to take advantage of the bore increase.

ssheets

iTrader: (1)

Gunnar@Patriot

iTrader: (20)

If they are our heads, we will upgrade the valve size, provide all materials including valves, Patriot Gold springs, ti retainers, viton seals, and super 7 locks. We will do this for $450.00 which includes labor, parts, flow sheet, and return shipping.

AdamSS

iTrader: (3)

Gunnar, are you guys working on releasing the Titanium valves for Ls1 heads ? I saw your post making that claim a while ago...any progress/update ?

That would be uber-pimp !
Think about it guys: Ultra weight valves, some 918 springs with Titanium retainers, and you can spin your motor to 7K easily with no issues...not to mention, it would be reliable and last quite some time.... That would definitely be a mean setup !

ssheets

iTrader: (1)

That's a helluva deal