Slabside Engine Builder UK

[Metralla]

Can you please recommend/suggest any engine builders in UK that have experience with slabside engines?
Google search is not very helpful.

[DAZ]

You could try Roger Upperton in Leeds , I don't know if he's building engines anymore I did hear he was semi retired and just selling parts but an excellent reputation for high performance , he's on Facebook I believe 

[Gixer1460]

Sean @ BigCC Racing could sort you out. They've probably built 100's of oil boilers over the years - slabbies and slingers - they are essentially the same. Don't phone today - it's Horsepower Shoot-out Day! Sort out what you want and your budget - you WILL spend more!

There are plenty of others if you look in the right places!