There not new seats, Just re-worked the stock ones to fit. All I'm saying is You don't have to replace the stock valve seats to fir the bigger valves, Just massage them a little

 

Thanks for all the info I have ported them real real well and am ready to buy valves and send them off. It sounds like 2.00/1.56 is good to me.

Tell me what can I expect to pay a shop for that kind of work??

 

hate to be the person to tell you this but you cant cut the stock seats to fit on the outer edge of a 2.02 and 1.60 valve there is not enough seat there. yes they will seat but they are seating on the back of the valve. there is no gain from 2.00 to 2.02, becuase the 2.02 is starting to become a restriction since its seating more on the back of the valve than the edge.

waht we are trying to tell you is that they do fit, so your right there, but there are not fitting right,meaning on the outer edge. sorry.

 

i paid 600, and i got a decent port job along with my larger valves

 

You COULD position a 2.02" valve, on the seat angle of an oem 2.00" O.D. seat insert correctly, but it would imply/mean no approach/top angles (15* or 30*). IOW, the O.D. of the insert would also be the O.D. of the seat angle. Regardless, not desireable or correct way of doing things. BTW, what is referred to here as "the back of the valve", is actually an area close to the I.D. of the valve face (45*) angle.

If the seats are machined/ground correctly, for any valve/seat combo, the O.D. (outer edge to some) of the valve, will NOT come in contact with the seat angle (45*) of the seat insert. If it does, something is not correct. This may not be a good example, but you want the seat to 'dig' into the valve with wear, not the valve 'dig' into the seat.

I set my seat angle OD .020" smaller than OD of the valve. The intent is to install with edge of valve off of the seat angle OD. The remainder of the seat insert allows room for the dedicated 15* and/or 30* approach angles.

 

I put 2.05 1.66 on my stock aluminum heads

Everything I heard about valve sizes state nothing bigger then 2.00 intake and 1.55 exhaust because it completely negates the bigger valve size since their is no chamber anymore; it's just 2 big valve holes

 

If the stock valve seat is 2.062 and is listed in the parts book as accepting valves up to 2.02 I don't see why it won't work.The engine builder who did my short block and heads who does nothing but race engines all day long and had no reason to put the bigger 2.02 valve in and could have used the 2.00 valve if he thought the bigger valve wouldn't have worked.

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grygst76 Quote: Everything I heard about valve sizes state nothing bigger then 2.00 intake and 1.55 exhaust because it completely negates the bigger valve size since their is no chamber anymore; it's just 2 big valve holes
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That's why you un-shroud the valves when opening up the combustion chambers which he did to 69cc

Bottom line is the motor runs great.

 

well the guy who put your valves in didnot do it wrong its just that the 2.02 valve will not seat t the point on the valve its design to. just becasue youhave a part number that says 2.062 doesnt mean you can cut that much out.

the point is that a 2.02 valve will not flow anymore thatn a 2.00 on a set of stock heads with stock seats.