[Roadsters] Valves leaking while cc'ing

[Daryl Smith]

Thanks for the note Steve, and others as well.

I provided the machine shop with the list of spring specs/heights and stock 
valve dimensions with the work order.
Seats? This is the SECOND shop that has told me that the stock seats in the 
aluminum head were in good shape, would be fine with the unleaded fuel, and 
there was enough material there to modify for my oversize 1.70" intake 
valves, and 1.35" exhaust valves.....
I had suggested that they should change the exhaust seat since the new valve 
was almost 2.3mm larger, but they were adamant that it was fine and they 
didn't need to be changed.????
Is this a case of "we just don't want the work"???

Here's hoping this discussion saves someone else some time/money.......

Daryl

----- Original Message ----- 
From: "Steve Ehlers" <stevenehlers at charter.net>

> Hi,
> This is typical of  poor quality  machine work .Even with a slight 
> interference angle made on seats and valves ,there should be NO
> leakage . If the head wasn't assembled you can seal the valves with a thin 
> grease coating ,as we do when building a combustion chamber matched high 
> Performance head set up .If the valves had been lapped in during the valve 
> work a problem would have been seen in contact or possible run out on the 
> seat .Quality machine work can't be assumed by the end user if  you don't 
> know the details of a quality job .
>
> For example , did you have new steel intake seats installed ,and at the 
> right valve height ? Can the Machine shop even provide you with the 
> correct stem height dimension . I doubt it !
> Good Luck ,
> Steve Ehlers
> www.risingsunperformance.com