This is a cheap and temporary engine made with mostly used parts. As it is temporary, the experimental spray bar parts are only a few dollars and the labor is all in house.
He has plans for a stroker replacement with aluminum heads and a solid roller camshaft. In which case the cheap (to us) spray bar may then also be employed due to expected long periods of low rpm on non-pressure fed axles in inexpensive solid roller lifters.
Why solid?
We both dislike hydraulic rollers.
And.....no further explanation will be given on the hydraulic roller as I've grown tired of discussing it.
