Quote:
Originally Posted by Jay S
I like Powell a lot, but it is a pretty big assumption that 330 cfm is needed for turning 5500 with 460 CID. That is more of a modern engine family way thinking for an LS, Gen 3 Hemi, or some Ford’s. Even on a modern engine platform it is a big stretch, that is well over 130 % VE.
One of the guys on PY recently dynoed in at 490 HP@5100 with his 461 Pontiac with 242 CFM D ports and 560+ lbs of tq. It was a Bullet HR and 236/ [email protected]”. With a single plane intake, more carb and bigger headers, it even would have made peak power at close to 5500 with those 242 cfm heads. |
Very similar to mine. 254cfm iron heads, iron intake, qjet, 232/241 @ 050 hft,,112 LS. 491 hp at 5200, 570 trq at 3100 rpms.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86'
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10-15-2025, 01:03 PM
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