LS1 Valves....

[AZ3.8Camaro]

Somebody here in town can put new valves in for me...
I got a free set of LS1 valves brand new when I bought my springs.

Stock is 1.80 Intake and 1.52 Exhaust.
LS1 is 2.00 Intake an 1.55 exhaust.

I think it would make some pretty good gains,
do you guys think they would fit?
How do the stem diameters match up?
Valve seals might be a problem...
How do the LS1 and L36 seats/seals match up?

[StudlyCamaro]

provided ive never seen a 3.8 head, but adding a .2 inch larger intake valve would be huge.. i really doubt it will fit , the exhaust may be a possibility

if the valve stems are the same diameter, i think they are, then you could use the stock valve seals

[merlinsrealm]

I have flowbench all the different valves for the 3.8 heads and the LS1 valves will give you LESS CFM across the board.......

I would not do it.

[AZ3.8Camaro]

Merlin - how about in the upper 3000-6500 RPM band?

[slomaro]

go read about intense stage 3 heads they put the biggest valves our heads can take read there article and why

[WickEdSix9838]

how do u know the lengths are they same? or the stem diameters?? also the biggest ive seen in a 3.8 head is a 1.900 and a 1.600 exhaust...

[AZ3.8Camaro]

I don't know that they are the same. I was asking, and/or going to check it out myself.

Might not be worth it.

[WickEdSix9838]

i just remembered the stem diameters may be the same because we can use the same retainers as LS1's BUT im not sure about the lengths

[merlinsrealm]

NO, The stem lengths are not the same....Our v6 valves are shorter.

[merlinsrealm]

<blockquote>quote:</font><hr>Originally posted by AZ3.8Camaro:
Merlin - how about in the upper 3000-6500 RPM band?<hr></blockquote>

It will depend on how the haeds flow....

220 CFM from 3 different companies does not mean you will see the same results. I have the flow numbers from the 3 companies doing our heads and they all put down high CFM numbers @ .500 but down low they suck. Our v6's need as much CFM down low and mid to make any real power for decent track times....

I will give a qucik example....

SUPER Six intake flow @ .200 123.9
Thrasher intake flow @ .200 124.4
Intense intake flow @ .200 131.0


Now take the number @ .200 that I ported 143.0


Like I said I am giving an example....

I am out flowing them across the board up too .400

They use bigger valves to bring the high numbers @ .500 but to me those numbers dont mean anything if you cannot produce the low end torque needed for the track.

[WickEdSix9838]

<blockquote>quote:</font><hr> They use bigger valves to bring the high numbers @ .500 but to me those numbers dont mean anything if you cannot produce the low end torque needed for the track.

<hr></blockquote>
thats true, the big numbers are what sells, but the higher mid-range numbers are what run, the short turn is VERY critical to get good flow, my dad has been porting heads for 25-30 years and is just now starting to get to where he can do the short turns on any kind of heads w/o having to do much extra flow bench tuning...im ready to see what he can do w/my heads!