Thread: Flash Lube Valve Saver

nope if youve got the hardend seats you dont need the flashlube.

Originally Posted by Blknight.aus

nope if youve got the hardend seats you dont need the flashlube.

I have made the assumption that all V8s have hardened valve seats.

alloy heads = hardened valve seats

Sort of related question - the fuel saver was being sucked by the small vacuum ports on both carbies just where they bolt to the manifold - they were joined by a small T junction. Does each carby just feed fuel air mix to the side of the engine it is on or is there a common chamber at the start of the inlet manifold that then branches to the 8 cylinders. I would prefer to take vacuum from just one of the ports for the vacuum gauge and block the other - if I have to join them then it means another trip to the shop.

Thanks

Garry

nope not all v8s have hardened seats, they all have valve seat inserts but depending on how old the heads are depends on what you get.

if the engine was ment to run super its likely to have the softer seats.

Originally Posted by Blknight.aus

nope not all v8s have hardened seats, they all have valve seat inserts but depending on how old the heads are depends on what you get.

if the engine was ment to run super its likely to have the softer seats.

So how do I tell if my 3.5 has hard or soft seats - mid 70s vintage - lower compression engine 8.?:1.

Cheers

Garry

Originally Posted by garrycol

So how do I tell if my 3.5 has hard or soft seats - mid 70s vintage - lower compression engine 8.?:1.

Cheers

Garry

All alloy heads have a valve seat insert which is mostly hardened and usually similar to piston ring material, rover V8's of any vintage dont need flashlube.

I have never in 25 years fitted flashlube to any Rover/P76 V8, only once have I seen a burnt valve in one on LPG, and that was on an engine that had over 600,000km on it. Apart from hardened seats, most early engines had poor/not fitted valve guide seals, so enough oil gets to the valves. When I repair early engines I deliberately fit inlet valve stem seals only, keeps a little oil going to the exhaust valves.
As for vacuum, there is no flow to your gauge, connect it to either carb. If there was a substantial vacuum difference between your carbs, your idle would be rough as your carbs would not be in balance.