[Jay S]

Did he say they have a core to grind it?

IMO, leave it on 112 like Tim has it for RA manifolds. It will have plenty of vaccuum, no reason to go wider unless you pair it with a bigger exhaust profile,10 or more. I have use the H31 232@.050 and H33, 240@.050 in a 455 on 112LSA for a 068 replacement in 455s. It’s is a newer version of that 288&296 with a little more acceleration and it has .3334” lift lobes on both the intake and the exhaust. We use 1.6 or 1.65 rockers, puts the lift in the mid .550s. In a completely stock looking 455 with lower 9s compression it won’t lope unless it idles down to about 600 rpm, has a ton of vaccuum, Icl on 108. If I had to describe the idle with another cam I would say it idles similar to a summit 2801 (214*, 224*)@.050”with 1.65 rocker arms, which is pretty stunning for how much bigger the Bullet is.. When you widen the LSA of Ultradyne grinds out it is pretty surprising how nice they idle for as big as the cams are. 288&296 Cam Tim picked will idle a little rougher than the H31&H33. Not sure which one will make more power though. When I worked with Tim to move the LSA out to 114 on 455s we used a .3334” paired with profiles with on less acceleration on the exh profile. Smallest cam I would do on 114 is the H32, which is 283@.006 and 235@ .050 or bigger 290@.006 and 239@.050. Done all of those, great cams, Tim is awesome.