Are lq4 rocker arms and ls1 the same?
06-27-2009, 01:25 PM
#2
Heads
4 basic types
Cathedral port - 15 degree valve angle, 3.89” minimum bore
LS1/LQ4/LQ9
LS6/LS2
Wide Rectangular – 11 degree valve angle, 4.10” minimum bore
LS7
Tall Narrow Rectangular – 15 degree, 4.00” minimum bore
L92/L76/LS3
C5R – 11 degree, 4.10” minimum bore, racing head
All 4 types are standard 4-bolt per cylinder LS bolt pattern
Intakes
3 basic types
Cathedral port
LS1/LQ4/LQ9
LS6/LS2
Wide Rectangular
LS7
Tall Narrow Rectangular
L92/L76/LS3
Each intake type has a unique port size, port shape and port location as well as a unique bolt pattern.
Intake type must match head type.
Blocks
5 arrangements
3.89” bore – 4-bolts per cylinder – no main web pockets
LS1/LS6
4.00” bore – 4-bolts per cylinder – no main web pockets
LQ4/LQ9/LS6/L76
4.065” bore – 4-bolts per cylinder – no main web pockets
L92/LS3
4.125 bore – 4-bolts per cylinder – has main web pockets
LS7/C5R
LSX Block – 6-bolts per cylinder – has main web pockets
Bore range 3.99-4.25
All blocks have the std. LS family head bolt pattern minimum
All LS blocks have same size main journals, cam bearing sizes, front and rear bolt patterns, etc.
Earlier model LS1 engines have some unique features, for these features, see the High performance LS1/LS6 V8 guide (p/n 88958786)
The LSX 6-bolt head pattern is based from the standard pattern, with the additional 2-bolts per cylinder – ANY LS BASED HEAD WILL BOLT ONTO AND WORK WITH THE LSX BLOCK
Cams
3 types
.500” valve lift or less
Stock LS1/LS6/LS2/L92/L76/LS3/LS7 springs work
.500” up to .525” lift
Requires use of LS6 valve spring p/n 12565117 or 12586484 (non-LS7 Heads)
Stock LS7 Springs are ok to use
.525” up to .570” lift
Requires use of valve springs p/n 12586484 (non LS7 heads)
Requires Hollow stem valves (kit p/n 17801930 for LS1/LS2) for optimized valve control (non-LS7 Heads)
Stock LS7 Valves and springs are ok to use
.570” thru .591” lift
LS1/LS2/LS6/LQ9/L76/L92 heads – These cams will only work with aftermarket springs/retainers/keepers
Stock LS7 valves and springs are ok to use
Rocker Arms
4 basic types
Cathedral port heads - LS1/LQ4/LQ9/LS1/LQ4/LQ9/LS6/LS2
Intake and Exhaust rockers are all the same – p/n 10214664
1.7:1 rocker ratio
Wide Rectangular – LS7
Intake and exhaust are different
Unique rockers to the LS7 head – will not work on any other head
1.8:1 rocker ratio
Intake rocker p/n 12579615 has offset
Exhaust rocker p/n 12579617
Tall Narrow Rectangular – L92/L76/LS3
Intake and exhaust rockers are different
1.7:1 rocker ratio
Intake rocker p/n 12569167 – has offset
Exhaust rocker p/n 10214664 – no offset, same as cathedral port heads
C5R – Unique head, requires Jesel or T&D shaft mount system
Stock Rockers for all LS engines are NOT adjustable.
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MYALIMONY (09-08-2022)
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MYALIMONY (09-08-2022)
