Here's what i've been up to the last 2 months. Decided to bite the bullet and do the top end as it was burning a lot of oil through the valve stems.
Pretty obvious once i got the heads off what had been going on.
Many thanks to Autopontiac for the machining of the valve guide bosses to accept a positive lock valve stem seal!
I'll let the photographs do the talking.
Some Videos
Pontiac 400 Motor Top End Refresh
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Re: Pontiac 400 Motor Top End Refresh
sounds healthy mind you you will have a lot more pressure in the cylinders now then before as im guessing there was a fair bit of valve seat recession as per usual on the 400s
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