Carburated LS1 question

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03-28-2010, 10:34 PM

69chvl468

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Carburated LS1 question

I have a 98 LS1 in my chevelle, Im going with a carb and msd controller set up. I have a GM hot cam and a 4l60. What size and style carb would anybody recommend? And what intake? Any advice would be great thanks.

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03-28-2010, 10:56 PM

1970camaroRS

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Depends on what type of driving you're doing.

Guessing that this is a street car and your Chevelle is on the heavy side, I would use the Edelbrock Performer RPM intake and a Holley 750ish cfm vac secondary carb.

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03-29-2010, 11:38 AM

96t/acj

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which motor do you have cause you said ls1 like most of us do, but is it the 5.3, 5.7 or the 6.0?

5.3 600cfm carb

5.7 680cfm carb

6.0 750cfm carb

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03-29-2010, 03:27 PM

69chvl468

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Thanks. Its a street car. 3600 lbs. I have a 5.7 ls1 with a gm hot cam, headers, 4l60 trans, 3.31 gears. What carb? 4150? 4160? Edelbrock?

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03-29-2010, 03:45 PM

LS1MCSS

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If it's going to see mostly street driving, go with a vacuum secondary, electric choke, 750.

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03-29-2010, 03:48 PM

NemeSS

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4150 holley street hp carb. way better that regular dp right out the box. similar price

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03-29-2010, 05:23 PM

xpndbl3

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750 quick fuel double pumper.....forget that vacuum secondary comment, those are for motor homes and tow vehicles only. You'd be down 15hp on an engine dyno with one of those over a double pumper.

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03-29-2010, 06:04 PM

69chvl468

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Quote:

Originally Posted by xpndbl3

750 quick fuel double pumper.....forget that vacuum secondary comment, those are for motor homes and tow vehicles only. You'd be down 15hp on an engine dyno with one of those over a double pumper.

Dont the double pumpers use more fuel? And dont they tend to run rich? I was looking at the 670 street avenger.

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03-29-2010, 06:38 PM

1970camaroRS

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Quote:

Originally Posted by 69chvl468

Dont the double pumpers use more fuel? And dont they tend to run rich? I was looking at the 670 street avenger.

I ran a 670 and then a 770 street avenger on my vortec headed hot camed 355 SBC. I loved those carbs. The 770 would be perfect for a mostly street car.

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03-29-2010, 10:14 PM

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xpndbl3

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Quote:

Originally Posted by 69chvl468

Dont the double pumpers use more fuel? And dont they tend to run rich? I was looking at the 670 street avenger.

no ALL carbs need to be tuned. Keep your foot out of the secondaries and you'll be fine. Primary jetting will need to be moved up or down to get the proper fuel ratio, nothing out of the box is perfect.

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