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Old 01-28-2013, 08:21 PM
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Headers on bbc

hey guys, just wonderin how many horse-power will like hooker headers gain you on like a 402 or a 454 bbc?? thanks

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Old 01-28-2013, 08:41 PM
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headers bolt to the heads,lol.
tube size and length is related to horse power produced with the sum of all parts.

dont buy big tube race headers for a mild street engine. 2 inch primaries are good to 650 hp or more.
Tell us about your application?
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Old 01-28-2013, 08:41 PM
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Lots of variables, around town just crooozin you probably wouldn't notice anything except maybe the sound. Headers, and I mean GOOD long tube headers really make a difference performance wise at higher RPM. In a dyno application I've read where headers make as much as 30 or more HP......but again that's at higher rpm.
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Old 01-28-2013, 08:49 PM
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Quote:
Originally Posted by vinniekq2 View Post
headers bolt to the heads,lol.
tube size and length is related to horse power produced with the sum of all parts.

dont buy big tube race headers for a mild street engine. 2 inch primaries are good to 650 hp or more.
Tell us about your application?
So its a 1974 chevy shortbox 4x4 I had a 402 in it prety much stock til we pulled it the other day and found 1 broken piston and 1 or 2 pistons w/ broken rings...we were gona rebild it til today my dad herd of a 70's pickup with a 454 so i mite go take a look at that soon and maybe put it in my '74...if that 454 just has regular exhaust manifolds should i use them or my headers??
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Old 01-28-2013, 08:59 PM
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Always use headers. Use a smaller tube primary pipe for near stock engines. A mild 454 will be a tire melter
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Old 01-28-2013, 09:01 PM
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ya...thats probly what ill do...i guess we'll see...do you ever have problems with them melting spark plug wires??
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Old 01-28-2013, 09:10 PM
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Take the time to use wire looms and separators to keep the wires neat and tidy and away from headers. If the wires get close to a header pipe the put heat socks over the ends of the wires.
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Old 01-28-2013, 10:32 PM
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ok ya thanks found out that that pickup and motor are 1968's any idea about hp on that??
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Old 01-28-2013, 10:48 PM
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what year is the engine from the 68 pick up?
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Old 01-29-2013, 12:25 AM
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In 1970, GM pushed the performance bar higher with the introduction of the Chevy 454 V8. Unlike the popular Chevy 427 that was used in a wide variety of automobiles, the 454 was used only in high performance cars like the Chevy Camaro, Corvette and Chevelle. There were 3 different variations of the 454 that came onto the drawing board at GM during the 70s; the LS5, the LS6, and the LS7 which was designed but not produced for the general public most likely due to the massive smog restrictions that started lurking about in the early 70s. . Although the LS7 454 never made its way into any cars sold to the public, it was sold as a crate engine available through Chevrolet and claimed to produce around 500 horsepower.
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Old 01-29-2013, 12:40 AM
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My 330 horse LS-5 ended up with an L-88 cam. isky cloned version.that ended up in an 80 Camaro
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Old 01-29-2013, 12:46 AM
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The pickup and motor both are 1968's and thanks for all the info...hopin to go take a look at the '68 in the mornin'
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Old 01-29-2013, 12:52 AM
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I doubt the engine is a 68
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Old 01-29-2013, 01:06 AM
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Old 01-29-2013, 01:19 AM
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Headers on bbc

If the truck and engine are both 1968 it is probably a 396 ci or 427 ci. Both are good engines. Hereis alist of big block casting numbers. Print it.
Casting Number
Years
CID
340220
72-76
427
Truck Tall deck
345014
74-86
454
Truck
346236
74-76
454
2-bolt
359070
74-90
454
Truck
361959
73-85
454
Car & Truck
364776
68-84
427
Truck Tall deck
364779
68-88
366
Truck Tall deck
399204
70-71
509
4-Bolt Aluminum Can-AM
399289
73-79
454
2-bolt
399293
77-78
366
Truck
473478
68-84
427
Truck Tall deck
3716362
396
3732755
59-61
348
3732811
58
348
3751872
58
348
3755011
59-61
348
3771705
59-61
348
3782012
58-61
348
3782870
68-76
427
Truck Tall deck
3788068
62
409
3795623
61
409
3798962
62-65
348
Truck
3815707
58-61
348
3824553
66-67
366
Truck
3830814
63
409
3839752
62-63
409
3839754
65
409
3844422
64
409
3855961
66-67
396
2-bolt
3855962
65-66
396
4-Bolt
3855977
65-67
366
Truck Tall deck
3857651
409
Marine
3857655
62-65
348
Truck
3857656
65
409
3857658
409
Marine
3860386
62-64
409
3860387
58
348
3869942
66-67
427
2 & 4-Bolt
3873858
66
396
4-Bolt
3902406
67
396
2 & 4-Bolt
3902466
65-67
396
3904351
67
427
2 & 4-Bolt
3904354
66-67
366
Truck Tall deck
3916319
68-85
366
Truck Tall deck
3916321
68
427
2 & 4-Bolt
3916323
68
396
2 & 4-Bolt
3918319
66-70
366
Truck
3925521
68-85
366
Truck Tall deck
3935439
68-69
427
2 & 4-Bolt
3935440
68-69
396
2 & 4-Bolt
3937724
68-85
366
Truck Tall deck
3937726
68-84
427
Truck Tall deck
3946052
69
427
ZL-I Aluminum 4-Bolt
3946053
97
427
ZL-I Aluminum 4-Bolt 2nd design
3955270
69
427
2 & 4-Bolt
3955272
69
396/402
2 & 4-Bolt
3955274
68-85
366
Truck Tall deck
3955276
68-84
427
Truck Tall deck
3963512
69-71
427/454
2 & 4-Bolt COPO
3963513
73-76
454
3965440
68-69
396
3965449
68-72
396
3969852
68-84
366
Truck
3969854
69-72
396/402/454
2 & 4-Bolt
3969858
68-84
427
Truck Tall deck
3995623
61
409
3999289
72-78
454
Car & Truck 2-Bolt
3999290
72
402
2-bolt
3999293
68-85
366
Truck Tall deck
3999294
68-84
427
Truck Tall deck
6272176
68-76
366
Truck
6272177
72
402
2-bolt
6272181
73-76
427
Truck
10051107
454
4-Bolt Bowtie IV Short deck
10068286
90-91
454
4-Bolt IV Short deck
10069284
427
Truck
10114182
91-95
454
4-Bolt Gen-5
10114183
91-95
366
Truck Gen-5
10114184
91-95
427
Truck Gen-5
10134366
454
4-Bolt Gen-5 Bowtie Tall deck
10185050
454
4-Bolt Gen-5 Bowtie Short deck
10237297
96-up
454
4-Bolt Vortec 7400 Gen-6
10237300
96-up
502
4-Bolt 4.466 bore Gen-6
12550313
91-95
454
4-Bolt Gen-5
12556110
01-up
496
4-Bolt Vortec 8100 Gen-7
14015445
75-90
454
Car & Truck
14015543
87-90
454
4-Bolt Gen-5
14044807
454
4-Bolt IV Bowtie Tall deck
14096859
502
4-Bolt Gen-5
24502504
454
4-Bolt Gen-5 Bowtie Short deck
24502572
4-Bolt DRCE-2 Olds "9.5"" deck"
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