What is the best valves to put in lt1 heads the castings are 561 ? Also what is the biggest ? Thanks to anyone with info

 

Manley Stainless Pro-Flo Valves 2.00" Int/1.56" Exh

 

There is some guy selling some 1.94/1.56 on here would they work as well

 

opps there 1.94/1.60

 

That is the stock intake size.


Real question should maybe be how do you define best?

Could mean lightest, strongest, best flow, most heat resistant, good at all but great at none making it a good balanced value????

 

All of the above strongest,lightest,best flow etc..... So 1.94/1.56 is stock size ?

 

Stock exhaust valve size is 1.50".

 

So stock is 1.94/1.50 ? Im mixed up hopefully this is correct

 

Yeah.

 

I'm using 2.02 / 1/60 Manley SS valves. Lots o' breathing, very fine quality valves.

 

i didnt think you could go that big

 

You can, but you need to machine the valve seats.

 

im thinking 2.00/1.60 What yall think ? idk thats why im asking

 

That'll be fine.

 

Would the seats need to be machined ?

 

At the very least, if you're installing bigger valves, you need to have a valve job done to support the flow of the newer valves. In short, yes.

 

With some work having to be done, you can use ls1 valves. They are 30percent or more lighter that lt1 valves. They are stock size, but keeping valve train weight down can pay big dividends, this is what I'll be doing come time to port and rebuild my heads.


hth

andy schuck

 

Seems like a good idea

 

Interesting, never heard of that before.

 

whether LS valves are lighter depends on the valves being choosen, a blanket statement doesn't really work.

I would not be so quick to assume a 1.600 valve will fit the seat, dig a little further before commiting to anything.