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Re: Valve Seat Recession

To: David Allen <dandr@mail.gwi.net>
Subject: Re: Valve Seat Recession
From: Paul Hunt <paul.hunt1@virgin.net>
Date: Tue, 09 Jun 1998 21:11:50 +0000
David Allen wrote:
> 
> Hi Paul: I have not had much luck with unleaded fuel. My BGT travels from
> 6 to 15 thousand miles a year and I'm on the fourth valve job in six years.
> Just replaced the original cyl head, which had seats in the exh and intake.
> The exh.seats were worn excessively, the intakes were fine. I think you
> would be wise to specify the hardest seat, your machinist can come up with.
> IMHO it depends on how hard you drive and the rpm's the eng. is turning.
> A V8 B with the original gearing is not going to be a problem, a 1800 B
> is going to wear the seats rapidly ,in my opinion. I now use a lead
> substitute,with hardened seats!!
> 
>                     Hope You Have Better Luck
> 
>                          Dave  '70BGT

Thanks for this, Dave.

I have a factory V8 as well but Roger Parker (someone who I consider to be an 
authority, 
judging by his input to the BBS) assures me that these already have hardened 
seats because 
of the alloy heads.  I have been using unleaded in this car for a while now, 
but not doing 
very many miles.  That is now to change to about 160 mainly motorway miles per 
day for up 
to a year.  We shall see.

Cheers,
PaulH.


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