headers 454
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
1) Hooker Super comps, 1 7/8"x3"
2) Hedman 2"x3".
Both fit relatively well and need minor mods to clear tall head bolts and around the idler arm.
Race Director
Joined: Dec 1999
Posts: 11,096
Likes: 990
From: Sierra Foothills CA
There's a video on Youtube using a high performance Chevy big block on a dyno to test exhaust components. The take away from that is- the shorty headers did almost nothing for the power curve. Long tube headers made a big difference. Adding an 18" collector extension to the long tubes added some additional horsepower and a bunch of torque. My Hedmans required a small dimple on a tube on the passenger side to keep it from tapping the frame at idle. Other than that they fit perfectly.
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
Had a set of Hooker super comps 1 7/8" on my 68 427. Took them off and installed the factory manifolds w/ a gardner exhaust system. I feel the change cost me around 30-40 hp so headers definitely do help on a BBC. I do miss the power but its a #s matching BB car bound for NCRS judging so they had to go.
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Joined: Jan 2013
Posts: 86
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From: Bradenton Florida
454 headers
Had a set of Hooker super comps 1 7/8" on my 68 427. Took them off and installed the factory manifolds w/ a gardner exhaust system. I feel the change cost me around 30-40 hp so headers definitely do help on a BBC. I do miss the power but its a #s matching BB car bound for NCRS judging so they had to go.
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Joined: Jan 2013
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From: Bradenton Florida
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Joined: Jan 2013
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From: Bradenton Florida