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Old 07-17-19, 10:50PM   #31
Gach
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Scat crank BME Rods your doing it right. Nice roller.
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Old 07-18-19, 02:15AM   #32
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Thanks Gach .. best wishes for both your health and your son's broken arm. Are you on the east coast or west? Thought I saw you post about getting dyno'd in RI. I sometimes deliver gas there.

NR100 supposed to be a bore-breaker … was thinking of sleeving lifter bores and using Howards maxi-lite solid roller lifters in the 2cnd 72 400 block to remedy … I have a set for a Chevy motor I have back-burnered, had hoped to check their durability in a short stroke sbc but it will have less spring with CC268 than the NR100 would need tho a higher operating rpm range possibly. Not sure they make the maxi-lites with Pontiac oiling location, different than sbc.
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Old 07-18-19, 11:45AM   #33
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The old UltraDyne NR100
309 at .020
280 at .050
203 at .200
.4507 lobe lift
At 1.5 ratio after lash probably about 0.650" lift

It will need lifter bore bracing.
Personally I'd use the PAC1243 spring rated 240 at 1.900

Don't complicate things ! Forget the Howards maxi-lite solid roller lifters and issues with Pontiac oiling location. Just be done with it and use a set of Crower solid roller lifters with pin oiling.
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Old 07-18-19, 12:11PM   #34
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"... the NR100 would need tho a higher operating rpm range possibly"


Example. On a Pontiac 450 cid w/4.125 stroke a similar UltraDyne solid roller years ago with 279 degrees at .050 made peak power at 6900/7000 rpm.
Victor intake / Brad Urban Stage III Holley
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Old 07-18-19, 02:08PM   #35
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Quote:
Originally Posted by Steve C View Post
"... the NR100 would need tho a higher operating rpm range possibly"


Example. On a Pontiac 450 cid w/4.125 stroke a similar UltraDyne solid roller years ago with 279 degrees at .050 made peak power at 6900/7000 rpm.
Victor intake / Brad Urban Stage III Holley
I agree, even a roller in 265 duration range is going want to make peak power @ 6500. Don’t mess with those chevy lifters..not worth the hassle. Definitely lifter bore brace.

PS: yes in RI
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Old 07-18-19, 02:45PM   #36
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The over etched Scat crank I would grind to 2.100 is already stroked to 4.040 though its at 2.200 now … I would use with current stoke just reduce to BME journal size of 2.100. I have Victor intake. Like appearance of Demon carb I have though its too small for racing, a King Demon might be nice. May not bore 2cnd 72 block .060, .030 would make 437CI. Will probably look for aluminum heads for that one. Going to quit speculating on next one and get 1st one done Am happy it appears my first 2 efforts will sport Scat forged cranks and otherwise beefy bottoms.
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Old 07-18-19, 03:35PM   #37
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One more Pontiac example, UltraDyne solid roller with 264 at .050" and 4.210 stroke made peak power at 6400 rpm. Now consider the increased rpm with a shorter 4-inch stroke. Another Pontiac dyno combination with a 4-inch stroke, this with a solid roller using 248 degrees at .050".... peak power at 6100 RPM.

Both of these with single-plane intakes and 4150 series Holly carbs.
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