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Old Jul 19, 2015 | 05:04 PM
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Default headers 454
what header should I use short or long on my 74 with 454? A lot of conflicting answers out there. Thanks
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Old Jul 20, 2015 | 03:02 AM
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Originally Posted by sportster89
what header should I use short or long on my 74 with 454? A lot of conflicting answers out there. Thanks
For an under car exhaust system:

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.
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Old Jul 20, 2015 | 11:20 AM
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Originally Posted by ajrothm
For an under car exhaust system:

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.
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.
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Old Jul 21, 2015 | 03:00 AM
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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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Old Jul 21, 2015 | 09:32 AM
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Default 454 headers
Originally Posted by dugsgms74
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.
thanks for the info.
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Old Jul 21, 2015 | 11:55 AM
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Too add to the other direction my 427 with too big a cam had factory manifolds.

Changed to Hedman headers and the difference was huge.
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Old Jul 21, 2015 | 12:29 PM
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Default 454 headers
Originally Posted by ddawson
Too add to the other direction my 427 with too big a cam had factory manifolds.

Changed to Hedman headers and the difference was huge.
Did you use shot or long headers? Also how was your ground clearance?
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Old Jul 22, 2015 | 10:09 AM
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Shorties are useless from everything I have read over the years.
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Old Jul 22, 2015 | 10:26 AM
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When I had my '74, it had Hooker headers and side pipes. I would go that route again.
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Old Jul 26, 2015 | 03:56 PM
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Default Headers 454
Originally Posted by snide
When I had my '74, it had Hooker headers and side pipes. I would go that route again.
I was thinking that, but I just put on flow master mufflers that are open. I Really should go that route just for the cool look. Thanks
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