Been that way for a few months, Site is there, you just can't access anything. Hope it gets sorted out.
I've read some aren't happy about some things with the StreetRodder engine builds, but his site has/had a lot of great info on the vintage engines. Be sad thing if it is lost.
Do a search here to fill in some blanks. We have better more trustworthy vintage engines guys here on the HAMB, McTim, Goatroper and many others.