[LS66]

Team,

I have recently purchased my dream car, 67 Chevelle (not 66) with an LS Swap 5.3 (truck engine). Still waiting to see if it is a 5.3 and not a 4.8. Need to take one of the heads of to see if I have flat or dish pistons. Hoping for the dish, since that will let me know, I have a true 5.3.

However currently the car is not running, this is the way a purchased the beast. This is what I am tracking the car has:

Stage 3 CAM
Stock Injectors
862 Heads (not sure of the work done)
4L60 Trans
2800 Stall converter (from what I was told)

This is all I am tracking at this time. What do you all think I need to do to make a 500HP Chevelle? To get the car running right now is to replace 2 injectors, starter, and alternator. Then the beast will be good to fire up, this again is what I was told from the seller.

Any advice would be appreciated!

 

[Jasons 69 Chevelle]

Pull a spark plug and a light you can see the piston top at bdc.
More cubic inches for 500 hp thats streetable in NA form.
Stage 3 cam not sure of what numbers are, but that 2800 stall will be okay with a 210ish intake duration cam.
You may need to go back to the drawing board.
easiest way to hit your goals with the current engine 4.8/5.3 is with a turbo.

I had a NA 5.3 with TSP 2.5 5.3 heads TSP 224r cam 3200 stall. It put down 338 rwhp at 6500 rpm’s. That maybe around 420-440 at the crank.
Wouldn’t go any bigger then that 224r cam on a street driven 5.3.

 

[123pugsy]

If the engine has been worked on, it may have 4.8 pistons. I used them in my 5.3. You need to check the stroke to be certain.

 

[LS66]

Jason 69,

Thanks for the quick response. I do want to do a Turbo set as well once the car is gets up and running. For the 1st step I just want the car to start without issues.

Jason sorry for the newbie question but can you clarify "Stage 3 cam not sure of what numbers are, but that 2800 stall will be okay with on a 210ish intake duration cam. "?

Just having I hard time with the 210sh intake part. Sorry but new to the game, but super excited to learn more.

 

[LS66]

123pugsy,

Thanks, looks like I have a lot to do and learn how to do. Like learning how to check the stroke on this LS.

 

[Jasons 69 Chevelle]

“Stage 3 cam”what are the specs of the cam you’re looking at.

These are the spec of the cam I’m using
242/246 114+3 .621/.604

Intake 242/exhaust 246 duration LCA 114 ICA 111 intake lift .621 /Exhaust lift .604 with a 1.7 rocker

Grind # XA242/365-XA246/355-14+3
Aggressive Street Performance
Duration at .050: 242/246
114 Lobe Center Angle with a 111 Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .621"/.604"

2800 stall would be match better with a 210 intake duration cam.

Get a LS engine build book. That may help you understand engine terms better.

It would be best to contact a known cam guru for the LS based engine. Pat G tuning does a good job selecting a cam for your setup. And a few others just be honest with your intended use.

 

[B52bombardier1]

Remove a spark plug and get the Harbor Freight camera video kit. Stick the lens down the plug hole to see if the pistons are dished or not. No need to remove the heads at this point.

Rick

Sent from my SM-G965U using Tapatalk

 

[pcguy]

Did HF change the diameter of the camera probe. Tried it once and it was too big...

 

[B52bombardier1]

I remember doing it with my LS engine but it could be that I got a good view from the top of the spark plug hole.

Rick

Sent from my SM-G965U using Tapatalk

 

[mjc]

Did HF change the diameter of the camera probe. Tried it once and it was too big...

I just got an endoscope off Amazon that plugs into the USB port on my phone to look inside my engine. It cost me something like $30.

 

[123pugsy]

4.8 L?

Nope........just the pistons.
Stroke measurement is the only guaranteed method.

 

[LS66]

Team,

Thanks for all the replies. Really appreciate all the information.

Is it a true statement that if my piston heads are dished that the engine block is a 5.3? Or is it really necessary to check the stroke?

 

[LS66]

“Stage 3 cam”what are the specs of the cam you’re looking at.

These are the spec of the cam I’m using
242/246 114+3 .621/.604

Intake 242/exhaust 246 duration LCA 114 ICA 111 intake lift .621 /Exhaust lift .604 with a 1.7 rocker

Grind # XA242/365-XA246/355-14+3
Aggressive Street Performance
Duration at .050: 242/246
114 Lobe Center Angle with a 111 Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .621"/.604"

2800 stall would be match better with a 210 intake duration cam.

Get a LS engine build book. That may help you understand engine terms better.

It would be best to contact a known cam guru for the LS based engine. Pat G tuning does a good job selecting a cam for your setup. And a few others just be honest with your intended use.

Jason69,

So I found out I have a Brain Tooley Stage 3 Truck Cam in the engine.
These are the specs that I am tracking:
Intake [email protected]/268 Degrees
Exhuast [email protected]/274 Degrees
Intake [email protected]/218 Degrees
Exhaust [email protected]/224 Degrees
Lobe Lift Intake/.325
Lobe Lift exhuast/.325
Rocker Ratio/1.7
Net Lift Intake/.553
Net Lift Exhaust/.553

What type of injector do you all think I should run for this CAM? I have stock 26lbs injectors installed.

 

[Hotwire]

Go to your local pull a part, find a flex fuel truck and pull those injectors. 33lbhr will be fine, it's what I'm running in my LQ4 6.0L w/ an elgin E1839P cam (220/224, 112 LSA, .575" lift)

Don't think I've seen anything over 72% injector duty cycle all the way up to 6400 rpm during a pull.

 

[Jasons 69 Chevelle]

25’s will support 400hp at 90% duty cycle
With that cam your 5.3 should be 400-420 at the crank those 25’s will be at 95%. 25’s may work but you could possibly max the injectors out.

I’d step them up to at least 28 or 33 like Hotwire mentioned if you have e85 available and plan on running it. 33’s will support 470 at 80%
28’s would support 420 at close to 85% duty cycle.
For some reason I used 25 instead of 26 lol
26lbs would support [email protected]% [email protected]% [email protected]% [email protected]% [email protected]%
26 would probably be ok
That stage 3 from BTR will be a good cam.

 

[123pugsy]

Team,

Thanks for all the replies. Really appreciate all the information.

Is it a true statement that if my piston heads are dished that the engine block is a 5.3? Or is it really necessary to check the stroke?

It's true. As I mentioned, if there's been work done to the engine, just as I did, the pistons could have been changed.