Plugs and SC set up
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,943
Likes: 18
From: Henderson NV
Plugs and SC set up
Anyone running a L98 Supercharged setup, I understand it depends on all the mods doen (heads,fuel etc), but I am trying to figure out what plugs I should have in my L98, (procharger P600B, Heads supposely redone to accomadte blower with fuel pump and roller rockers)
Reason I ask, in the chiltons manual it has the stock AC Delco number, but the plug I pulled out is a diffeent number, Thanx
Reason I ask, in the chiltons manual it has the stock AC Delco number, but the plug I pulled out is a diffeent number, Thanx
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,943
Likes: 18
From: Henderson NV
OK i removed some plugs from the passenger side and they look normal
The lugs installed ar AC Delco 41-629, and they seem to be gapped at .030-.032,
manual calls for AC delco FR5LS for 85 and newer L98 with .035 gap.
So here is my setup , if anyone can recomend a plug and gap that would be great.
As mentioned Procharger P600B with Intercooler and fuel management with fuel pump.
Heads redone , valve job, guides, Roller rockers (dont know the ratio, but they are blue
), I was told thicker head gaskets to get the 9:1compression.
Exhaust is stock except muffler eliminators.
I have reset the timing to 6 degrees BTDC.
It also has the Hypertech race/street coil and distributor cap, MSD 8mm plug wires.
Any recomendations would be greatly appreciated.
The lugs installed ar AC Delco 41-629, and they seem to be gapped at .030-.032,
manual calls for AC delco FR5LS for 85 and newer L98 with .035 gap.
So here is my setup , if anyone can recomend a plug and gap that would be great.
As mentioned Procharger P600B with Intercooler and fuel management with fuel pump.
Heads redone , valve job, guides, Roller rockers (dont know the ratio, but they are blue
), I was told thicker head gaskets to get the 9:1compression.Exhaust is stock except muffler eliminators.
I have reset the timing to 6 degrees BTDC.
It also has the Hypertech race/street coil and distributor cap, MSD 8mm plug wires.
Any recomendations would be greatly appreciated.
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,943
Likes: 18
From: Henderson NV
I see the Rapidfire AC Delco #5 plugs are a replacement for the FR3LS6, FR5LS, if so are they gapped at .045. or do they come pregapped.
Thanx.
Last edited by Pizzano; Feb 25, 2008 at 06:42 PM.
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
Gap at 0.032" - 0.035". I would start at 0.035" and if there are no issues, I would leave as is. The wider the spark gap (to a point), the better the idle quality will be. When you start closing the spark plug gap, the idle quality tends to suffer.
Aaron
Aaron
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Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,943
Likes: 18
From: Henderson NV
Ah that explains the somewhat rough idle as they are gapped now around .032, thanx for the info Aaron, much appreciated
