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Program is who makes the 4 bolt main caps. You only get the center 3 caps. There is plenty of meat in the block. Make sure that you have a good machine shop install them and it will need linebored. They are a must in any engine that I build, or have built. then again I'm a member of the pump gas 700 club.

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...You are the first I've seen sense I've been here on Moparts that runs the ProGram caps. I've been wondering how well others have done with these caps.
...I bought 2 complete sets (bought #1 & #5 billet 2 bolt caps also) of the ProGram Billet 4 bolts caps & ARP studs in the late 90's, & had 2 blocks done buy a close machinist friend. He set up the cross bolt in the 2nd block just a tad bit higher in the block like the Hemi. Maybe not as high as a Hemi, but liked the Idea of a little farther away from the pan rail. I used the 2nd block as the 499" in my ~700 hp Pump gas street car for ~ 6 yrs. I only hammered on it for about 31 passes before putting it on the street. Probably not a lot of hammering for those that Drag Race every wk end. Had another block done with AL caps & studs too (at that time I think) after Koffle (sp)saying they had ~900ph (if I remember correctly) Low decks live with them. Haven't used that block yet either. Health keeps throwing sticks in my spokes. Anyway, nice to hear about other ProGrams.
...Put the #1 & #5 Billet ProGrams on after this pic. Sorry pic is a tad fuzzy.
...EDIT: I agree the AL cap is an easier route, may absorb the vibes better, & with the Girdle it would be hard to beat.