What happens when lousy header design and bad choice of CAM is used:

Code
RPM	TPS	CELL	Timing	LTFTB1	HO2B1S1	PWB1	LTFTB2	MAF	PWB2	HO2B2S1	MAFRQ	MAFgrms	INJDC	grmcyc	CFM	VacKpa
916	18	6	20	24	0.840	4.9	9	1	4.4	0.750	4135	8.45	3.4	0.138	77	37
916	9	20	20	24	0.310	4.9	9	1	4.4	0.420	4135	8.45	3.4	0.138	77	37
916	9	20	20	24	0.310	4.9	9	1	4.4	0.420	2719	8.45	3.4	0.138	77	37
916	9	20	20	24	0.310	4.7	9	1	4.2	0.420	2719	8.45	3.2	0.138	77	37
916	9	20	20	24	0.310	4.7	9	1	4.2	0.420	2719	8.45	3.2	0.138	77	38
848	9	20	21	24	0.310	4.7	9	1	4.2	0.420	2719	8.78	3.0	0.155	71	38
848	9	20	21	24	0.350	4.7	9	1	4.2	0.400	2719	8.78	3.0	0.155	71	38
848	9	20	21	24	0.350	4.7	9	1	4.2	0.400	2746	8.78	3.0	0.155	71	38
848	9	20	21	24	0.350	4.7	9	1	4.2	0.400	2746	8.78	3.0	0.155	71	38
848	9	20	21	24	0.350	4.7	9	1	4.2	0.400	2746	8.78	3.0	0.155	71	37
835	9	20	21	24	0.350	4.7	9	1	4.2	0.400	2746	8.82	2.9	0.158	70	37
835	9	20	21	24	0.340	4.7	9	1	4.2	0.400	2746	8.82	2.9	0.158	70	37
835	9	20	21	24	0.340	4.7	9	1	4.2	0.400	2753	8.82	2.9	0.158	70	37
835	9	20	21	24	0.340	5.0	9	1	4.4	0.400	2753	8.82	3.1	0.158	70	37
835	9	20	21	24	0.340	5.0	9	1	4.4	0.400	2753	8.82	3.1	0.158	70	31
763	9	20	21	24	0.340	5.0	9	1	4.4	0.400	2753	8.92	2.8	0.175	64	31
763	9	20	21	24	0.310	5.0	9	1	4.4	0.370	2753	8.92	2.8	0.175	64	31
763	9	20	21	24	0.310	5.0	9	1	4.4	0.370	2769	8.92	2.8	0.175	64	31


NOTE: the sliders are active so you can move through the data

Notice how lean the left head (LTFTB1) fuel trim is to what the right LTFTB2 is.

Stock LS1 with no CATs, mufflers, crappy LG headers with a CAM grind of :

237-242 605-610 112 LSA
STAGE 2.5 5.3 HEADS
UNDER DRIVE PULLEY
STOCK INJECTORS
LS1 INTAKE

Team ZR-1
True Custom Performance Tuning
Teamzr1.com