which starting pitcher has the most seasons with an era below 3.5 with a minimum of 400 career starts

Nolan Ryan played the most seasons by a starting pitcher with an ERA better than 3.50 and with 400+ starts, with 27 seasons.

	NAME	SEAS	ERA	GS	G	W	L	W%	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Nolan Ryan N. Ryan	27	3.18	773	773	318	291	.522	5,654	222	61	0	5326.0	3,880	1,884	2,151	314	2,748	156	0	75	22,310	275	9.55	4.64	2.06	0.53	25.3	12.3	1.24	.265	3.63	6.56
2	Tommy John T. John	26	3.35	700	700	284	228	.555	2,191	162	46	0	4622.1	4,699	1,718	1,981	295	1,223	98	0	99	19,321	178	4.27	2.38	1.79	0.57	11.3	6.3	1.28	.284	3.86	9.15
3	Roger Clemens R. Clemens	24	3.12	707	707	354	184	.658	4,671	118	46	0	4913.2	4,182	1,706	1,884	363	1,579	159	0	63	20,227	143	8.56	2.89	2.96	0.66	23.1	7.8	1.17	.284	3.45	7.66
4	Steve Carlton S. Carlton	24	3.20	709	709	327	240	.577	4,104	254	55	0	5165.1	4,616	1,835	2,096	405	1,814	53	0	145	21,457	177	7.15	3.16	2.26	0.71	19.1	8.5	1.24	.279	3.65	8.04
5	Jim Kaat J. Kaat	24	3.43	625	625	260	217	.545	2,294	180	31	0	4137.2	4,203	1,579	1,850	366	955	115	0	77	17,336	116	4.99	2.08	2.40	0.80	13.2	5.5	1.25	.282	4.02	9.14
6	Greg Maddux G. Maddux	23	3.15	740	740	355	226	.611	3,366	109	35	0	5001.0	4,717	1,750	1,974	351	996	137	0	177	20,388	70	6.06	1.79	3.38	0.63	16.5	4.9	1.14	.281	3.55	8.49
7	Don Sutton D. Sutton	23	3.27	756	756	321	253	.559	3,545	178	58	0	5248.1	4,670	1,905	2,095	469	1,333	81	0	96	21,500	110	6.08	2.29	2.66	0.80	16.5	6.2	1.14	.261	3.59	8.01
8	Randy Johnson R. Johnson	22	3.30	603	603	301	166	.645	4,818	100	37	0	4103.0	3,320	1,504	1,692	408	1,491	188	0	37	16,937	109	10.57	3.27	3.23	0.89	28.4	8.8	1.17	.290	3.71	7.28
9	Bert Blyleven B. Blyleven	22	3.31	685	685	286	248	.536	3,694	242	60	0	4957.1	4,614	1,823	2,021	428	1,316	155	0	67	20,429	114	6.71	2.39	2.81	0.78	18.1	6.4	1.20	.282	3.67	8.38
10	Phil Niekro P. Niekro	22	3.37	716	716	302	262	.535	3,181	245	45	0	5149.2	4,815	1,928	2,227	465	1,703	116	0	73	21,585	207	5.56	2.98	1.87	0.81	14.7	7.9	1.27	.270	3.89	8.42
11	Gaylord Perry G. Perry	22	3.10	690	690	305	252	.548	3,372	303	53	0	5156.2	4,762	1,778	2,045	382	1,314	101	0	144	21,140	150	5.89	2.29	2.57	0.67	16.0	6.2	1.18	.274	3.57	8.31
12	Warren Spahn W. Spahn	21	3.08	665	665	358	227	.612	2,501	382	63	0	5101.0	4,703	1,743	1,951	422	1,383	39	0	52	20,960	74	4.41	2.44	1.81	0.74	11.9	6.6	1.19	.258	3.44	8.30
13	Eppa Rixey E. Rixey	21	3.15	554	554	247	239	.508	1,244	289	37	0	4171.2	4,335	1,462	1,849	84	982	71	0		17,427	84	2.68	2.12	1.27	0.18	7.1	5.6	1.27	.283	3.99	9.35
14	Jack Quinn J. Quinn	21	2.85	443	443	192	185	.509	1,070	242	28	0	3215.2	3,474		1,502	85	675	79	0			41	2.99	1.89	1.59	0.24		5.3	1.29	.310	4.20	9.72
15	Justin Verlander J. Verlander	20	3.32	537	537	262	151	.634	3,463	26	9	0	3472.1	2,950	1,280	1,385	364	974	116	0	27	14,192	97	8.98	2.52	3.56	0.94	24.4	6.9	1.13	.279	3.59	7.65
16	Tom Seaver T. Seaver	20	2.86	647	647	310	203	.604	3,634	231	61	0	4776.1	3,961	1,517	1,670	378	1,387	76	0	115	19,337	123	6.85	2.61	2.62	0.71	18.8	7.2	1.12	.258	3.15	7.46
17	Red Faber R. Faber	20	3.14	483	483	227	186	.550	1,313	273	29	0	3643.2	3,658	1,271	1,605	103	1,054	93	0		15,357	42	3.24	2.60	1.25	0.25	8.5	6.9	1.29	.278	3.96	9.04
18	Grover Alexander G. Alexander	20	2.37	600	600	350	193	.645	2,096	437	90	0	4978.1	4,654		1,742	156	887	66	0		20,045	33	3.79	1.60	2.36	0.28	10.5	4.4	1.11	.267	3.15	8.41
19	Walter Johnson W. Johnson	20	1.72	654	654	371	242	.605	3,207	520	108	0	5447.0	4,516		1,736	89	1,276	190	0		21,802	140	5.30	2.11	2.51	0.15	14.7	5.9	1.06	.260	2.87	7.46
20	Zack Greinke Z. Greinke	19	3.48	541	541	220	153	.590	2,907	17	5	0	3316.0	3,142	1,282	1,377	360	742	77	0	22	13,579	99	7.89	2.01	3.92	0.98	21.4	5.5	1.17	.293	3.74	8.53
21	Kevin Brown K. Brown	19	3.26	476	476	210	143	.595	2,375	72	17	0	3237.2	3,058	1,173	1,345	205	890	139	0	42	13,456	108	6.60	2.47	2.67	0.57	17.7	6.6	1.22	.290	3.74	8.50
22	Rick Reuschel R. Reuschel	19	3.36	529	529	208	189	.524	1,990	102	26	0	3503.2	3,537	1,308	1,472	219	915	87	0	112	14,690	88	5.11	2.35	2.17	0.56	13.5	6.2	1.27	.289	3.78	9.09
23	Jerry Koosman J. Koosman	19	3.39	527	527	216	204	.514	2,464	140	33	0	3681.2	3,495	1,388	1,558	285	1,145	67	0	112	15,342	82	6.02	2.80	2.15	0.70	16.1	7.5	1.26	.282	3.81	8.54
24	Jim Palmer J. Palmer	19	2.80	521	521	262	148	.639	2,142	211	53	0	3857.0	3,256	1,202	1,334	292	1,259	37	0	36	15,714	83	5.00	2.94	1.70	0.68	13.6	8.0	1.17	.247	3.11	7.60
25	Luis Tiant L. Tiant	19	3.33	484	484	219	161	.576	2,284	187	49	0	3348.0	2,958	1,239	1,357	333	1,054	47	0	46	13,789	23	6.14	2.83	2.17	0.90	16.6	7.6	1.20	.261	3.65	7.95