Aftermarket 4-Bolt Cap Recommendations

Looking for recommendations for aftermarket 4-bolt caps, who makes a quality cap that will strengthen the bottom of a D9TE? Are they straight up or splayed? Who sells them, and do they accomadate a windage tray?

Machine shop to do the installation drill/tap and align hone.

Blue thunder has your best option for a thin casting block IMO

Ive got a set of 2-4 from Prgram engineering. Nice pieces. Tried accessing their catalog, its got a script error, but their site and email are still active. Might contact them for price and availability.

program caps are around $350-$400 range. ad $250 for the align bore ,plus what they charge to drill and tap for the splayed bolts ,fitting the caps to the block about $250.
just to give you an idea.

Thanks for the info guys!

I would guess a 2-bolt windage tray would work with a splayed 4-bolt cap.

Might have to cut the center strap on the tray between the bolts