1970 Dodge Coronet Specifications

How Headers And A Flowmaster 3-Inch Exhaust Equals 58 HP

Photography by David Fetherston

Not only does this R/T now sound as strong as it is, it also picked up a bunch of added horsepower to boot. After driving it for a day, Hoffman was still all smiles. Sometimes, it's the little things in life that can make your day.

Power Sheet
David Hoffman's '70 Dodge Cornet 440 R/T
	Baseline		3-inch System		Improvement
RPM	TQ	HP	TQ	HP	TQ	HP
2,100	305	123	339	135	34	12
2,300	304	134	341	150	37	16
2,500	316	152	350	166	34	14
2,700	328	168	357	182	29	14
2,900	342	189	373	207	31	18
3,100	352	207	382	226	30	19
3,300	363	229	395	249	32	20
3,500	365	243	402	269	37	26
3,700	365	258	403	285	38	27
3,900	361	267	404	300	43	33
4,100	353	275	401	313	48	38
4,300	342	278	390	321	48	43
4,500	329	283	381	327	52	44
4,700	323	289	372	334	49	45
4,900	307	287	364	338	57	51
5,100	293	285	346	337	52	52
5,300	281	283	336	338	55	55
5,500	273	285	326	341	53	56
5,700	249	269	302	327	53	58

* Peaks are in bold.* All data is corrected to 29.92 standard barometer with 60-degree F dry air.* Obviously, one could not expect to get the same gains with stock cast-iron exhaust manifolds, but the gains would still be significant.