#61  
Old 07-02-2021, 07:00 PM
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Vid Vid is offline
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Originally Posted by 1968GTO421 View Post
Let us know what you learn from Tim and what he rcommends. Thanks.

Haven’t heard anything back from my online inquiry so I’ll give him a call next week after the holiday weekend.


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  #62  
Old 07-13-2021, 02:28 PM
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Originally Posted by 1968GTO421 View Post
Let us know what you learn from Tim and what he rcommends. Thanks.

GRIND # PO288/296H112+4
Has 231/239 at .050
Gives .3233 lobe lift intake .491 at valve with 1.52 rocker
Gives .3383 lobe lift exhaust .514 at valve with 1.52 rocker
112 lobe separation 108 intake centerline
Max cam for vacuum brakes
Thanks Tim Goolsby


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  #63  
Old 07-13-2021, 02:59 PM
Steve C. Steve C. is offline
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From the OLD UltraDyne catalog regarding the 288/296 HFT ground with a 110 LSA.....

"Hot street/bracket cam. 3000 SS converter or 4-speed. No power brakes. Power 3000-6000"

As always regarding stated power in catalogs there is no mention of stroke and/or cubic inches involved.


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  #64  
Old 07-13-2021, 03:39 PM
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I’m wondering if I should order it on a 113 or 114.


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Old 07-13-2021, 04:11 PM
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Jay S Jay S is offline
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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.


Last edited by Jay S; 07-13-2021 at 04:21 PM. Reason: Add
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