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Thread: LS1 head porting
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09-18-2008 #1
Starting The Transformation
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LS1 head porting
Can 853's be made to accept 1.61 exhaust valves?
Also, are the Z06 valves the same length, or can they be made to work on a "standard" LS1 type head?
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09-20-2008 #2
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I don't believe the 853's will accept a 1.61" valve, the seats are not big enough. The LS6 valves from the 243 heads are longer (can't remember by how much) than the 853/241 valves to compensate for the smaller base circle cam used in the LS6 engine. GM decided to go that route instead of altering pushrod length.
09-21-2008 #3
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I wouldnt use the z06 sodium filled valves with an aftermarket camshaft anyway as their 'hollow' stems were not really designed for aftermarket valve springs and i have read several horror stories of them breaking.
1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
1978 Datsun 2+2 - 6.0L LS1 swap in progress
1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop.
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