Shim it. It puts too much slack in the cam chain (known problem). And start
shopping for a new machinist.
Gordon Glasgow
Renton, WA
www.gordon-glasgow.org
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of
> sh92@bellsouth.net
> Sent: Tuesday, May 20, 2003 11:18 AM
> To: datsun-Roadsters@autox.team.net
> Subject: U20 Heads
>
>
> My machine shop just informed me that my U20 head measures 4.479"
> from top to bottom. New is 4.528" This is a difference of
> 0.049" They also said that after a touch-up pass the difference
> will increase to 0.054"
> My question is, even though the book reccomends no more than
> 0.020" shaved, has anybody had a problem with this? My machinist
> says it will slightly retard the timing giving me more of a top
> end but reducing my low end power. He says I can shim the towers
> if i want to but doesn't feel it is necessary. It's my call
> whether or not to shim.
> Anybody have any experiance with this?
> Feel free to e-mail me directly
>
> Scott Haynes
> WPB, FL
> '68 2000
> '69 2000
> SH92@Bellsouth.net
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