68 340 Exhaust Manifolds vs TTi Shorty headers

toolmanmike said
We need a dyno shootout. :thumbsup: :thumbsup:

Installing Exhaust Headers Into 300hp Crate Engine - Exhaust Blowout

Legend318:Stock '69 A-Body exhaust manifolds with 24-inch extensions360:Stock '77 360 iron log-style exhaust manifolds with 24-inch extensions340:Stock '70 340hp exhaust manifolds with 24-inch extensionsSHT:Hedman 151/48-inch-tube shorty headers with 24-inch extensions 1 58: Hooker Competition 1 58-inch ceramic-coated header tti: Tube Technologies Inc. 1 58x1 34-inch chrome step header 1 34: Hooker Super
Competition 1 34-inch header; bare, uncoated

Dyno Results
Westech Engine Dyno Superflow 901
Torque
RPM	318	360	340	SHT	1 58	tti	1 34
2500	391.3	389.5	392.0	396.1	392.9	397.4	392.3
3000	389.0	390.1	394.3	396.5	398.4	399.5	395.8
3500	403.0	407.1	408.3	414.5	420.5	421.1	418.3
3700	400.2	404.7	409.1	413.7	423.9	425.5	420.7
4000	392.7	395.5	401.2	403.4	411.9	417.4	409.9
4500	362.6	365.8	367.1	374.1	372.7	380.9	374.3
5000	318.4	319.5	323.7	330.7	328.1	331.6	326.3
5400	273.2	283.5	281.4	286.6	273	287.6	281.3

Horsepower
RPM	318	360	340	SHT	1 58	tti	1 34
2500	186	185	187	189	187	189	187
3000	223	223	225	226	228	228	226
3500	269	271	272	276	280	281	279
4000	299	301	306	307	314	318	312
4500	311	313	315	321	319	326	321
4600	211	314	315	320	317	327	319
5000	303	304	308	315	312	316	311
5400	281	291	289	295	282	296	289