LS1TECH - Camaro and Firebird Forum Discussion - Generation III External Engine

Spark plug boots on a LS6

LS1 TJ — Thu, 14 May 2026 01:05:29 GMT

So I was changing the spark plugs on my LS6. So the spark plug boots were stuck like glue to the spark body. Had to use a channel lock to pull them off.
Anyone use some type of lube to make them easier to remove? Maybe just a of touch wheel bearing grease on the barrel of the spark plug?

Starting issues

devlmaycry — Mon, 11 May 2026 05:57:15 GMT

I've got a 2004 Corvette that I just built a new motor for after cylinder 5 ringland let loose. It's an lc9 block, 799 heads, small summit cam, forged eagle stroker rotating assembly on a 3.800 bore, and the A&A kit I had on the old motor. Nothing wild in the scheme of things. I just got everything back together and now it won't start.

On vcm scanner I have rpm, MAF and MAP show changes, injectors are pulsing, timing advances, I'm reading fuel pressure at the rails, and the limited cam PID values change. Basically everything I know to check is showing it should be trying to start. However, it just cranks and cranks.

I'm not seeing any spark when I pulled a plug wire and tried the screw driver test or hold the plug wire near the plug or other grounding point. I have 12v to the pink wires on the coils and the grounds have continuity. I also went back and made sure I didn't have any grounds that I missed. So the common check the coil grounds and power has been checked. I'm at a loss as to what to check next.

Any help would be appreciated!

Help identifying the harness

thomasc8487 — Tue, 05 May 2026 02:24:39 GMT

looking if anybody knows what this harness came out of all the plugs and everything is as regular as ls engine seeking help to identify what it came out of to get some pinout schematics

EVAP purge valve removal

CapeCrawler — Wed, 29 Apr 2026 03:22:22 GMT

How do I remove the hose on the evap purge valve unit without breaking that white sleeve? What�s the trick to releasing it properly so the hose can be slid off?

Anyone ever put 243 heads on a 98 Camaro Z28

Richyrich78 — Tue, 28 Apr 2026 02:52:03 GMT

So I have my 98 Z28 tore down and 806 head off. I have a nice set of ported, polished and decked 243 heads I�m going to install and am wondering how the PCV lines are supposed to be ran since valve covers are different with different ports. Any information would be greatly appreciated. I am also installing a LS6 intake manifold.

Circulating coolant heater hosing

Zinkedoo — Sat, 25 Apr 2026 22:35:22 GMT

I got a 1000w Kat circulating coolant heater for my 5.3 lm4 in a 94 chevy k1500. Wondering where to put the return line from the heater? I have it going to the heater core return but when I plugged the heater in, the water pump weep hole started to leak. Unsure if the leak was there before or not. Image below is where the BLOCK heater plug is, the location doesn't work since it gets in the way of the motor mount brakcet.

Fresh Air feed to Valvecover?

LS1Silverado05 — Fri, 24 Apr 2026 03:38:00 GMT

OK guys I’m trying to sort out my catch can situation on my 383 build

Here is my situation and my question..

I’m running an elite engineering catch can.. I am feeding the dirty side from the driver side valve cover.. around the back of the intake and along the passenger side valve cover to the catch can. My intention is to cap off the back port of the passenger valve cover and provide a fresh air feed to the front port of the passenger valve cover. And of course, naturally run the catch can outlet to the intake manifold port behind the throttle body.

My main question is this. I’m running a fast 102 that has an LS2 throttle body on it.. so there is no positive pressure fresh air port on that throttlebody. From everything I’ve been told and read I should be able to grab fresh air anywhere after the MAF.. and prior to the throttlebody. My my question is, wouldn’t that make it a negative pressure source under throttle and not "feed" the valve cover fresh air? And if so, does that matter for the purpose I’m trying to achieve.

Is a dry sump worth it?

HappySalesman — Fri, 17 Apr 2026 23:43:41 GMT

Have plans on building a 427 for my c5 that is going to see a mix of street/road race track days (mostly street though). Is a dry sump really worth the expense? Or is improving the oiling system the better option?