GM Vortec Heads

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	1.94	2.00	2.02	1.5	1.5	1.57
.2	129	136	142	95	111	112
.3	180	195	200	130	155	162
.4	216	231	240	148	178	185
.5	220	245	265	155	185	200
.6	220	252	270	158	195	205

GM Vortec Bowtie

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.00	2.02	2.05	1.55	1.57	1.57
.2	129	137	145	102	111	113
.3	184	198	201	134	157	163
.4	225	238	245	152	185	190
.5	235	248	270	162	193	201
.6	236	253	275	165	196	205

GM Bowtie

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.02	2.02	2.02	1.6	1.6	1.6
.2	128	136	138	105	111	114
.3	180	192	198	134	158	166
.4	218	230	240	140	165	182
.5	220	250	262	142	175	190
.6	221	256	270	144	185	200

Dart 165 cc - Covered up 172 cc

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	1.94	1.94	2.00	1.5	1.5	1.5
.2	118	126	135	105	108	110
.3	172	180	192	130	140	145
.4	209	218	235	138	166	170
.5	224	242	248	139	179	185
.6	222	250	254	140	190	195

Dart 180 cc - Covered up 188 cc

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.02	2.02	2.02	1.6	1.6	1.6
.2	132	138	140	105	111	114
.3	185	197	200	127	136	140
.4	218	235	241	148	165	182
.5	222	251	265	165	185	192
.6	221	260	275	175	195	205

Dart 200 cc - Covered up 208 cc

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.02	2.02	2.05	1.6	1.6	1.6
.2	133	138	142	105	110	113
.3	187	198	200	129	142	143
.4	225	240	241	154	168	180
.5	245	271	275	164	185	198
.6	245	288	293	173	193	205
.7	242	295	302	176	195	211

Dart 200 cc Platinum - Covered up 212 cc

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.02	2.02	2.05	1.6	1.6	1.6
.2	133	138	142	105	111	113
.3	187	198	200	135	145	147
.4	227	240	241	157	170	183
.5	250	272	275	172	188	198
.6	255	290	293	185	198	205
.7	260	295	302	190	203	211

World Product Dart II

	Stock Intake	Covered Up	Fully Ported	Stock Exhaust	Covered Up	Fully Ported
	2.02	2.02	2.05	1.6	1.6	1.6
.2	128	138	142	105	112	116
.3	184	196	200	127	145	153
.4	215	235	244	240	165	171
.5	232	257	275	148	178	190
.6	240	282	295	148	185	195
.7	245	288	305	150	195	202

GM Open Chamber 441 487

	Stock Intake	Covered Up	Covered Up	Stock Exhaust	Covered Up	Covered Up
	1.94	1.94	2.02	1.5	1.5	1.6
.2	120	130	135	98	105	107
.3	166	178	190	125	138	145
.4	194	218	224	140	160	172
.5	198	222	230	141	172	186
.6	200	225	238	141	177	190