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Old 02-16-2012, 10:05 PM
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LT1 Intake.

I know Edelbrock makes LT1 intakes but all i hear about them is not good. I like my 355ci LT1 in my 94 FireBird which is my DD, And we have it running 7.63 1/8 mile. This has been a good engine, but we are wantig go with more ci now and feel the intake options are what will hold us back. So i guess what i am asking is are there any good intakes out there. If not who does real good port work on stock peices. Thanks for any advise. Beau.

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Old 02-16-2012, 10:34 PM
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What about the LT4 head and intake package?

Keith
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Old 02-16-2012, 11:07 PM
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We will be using the tfs 195 heads on a 397ci LT1. I do not know the max potenetial of a stock or ported LT1-LT4 intake, I hear they are still better than the Edelbrock? IF the LT1-LT4 intake with some healthy porting is my best route, Then i would be moore than happy to use either one.
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Old 02-17-2012, 06:24 AM
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not good for weight savings but the stock Iron heads tend to flow up to almost 20% more than the F body aluminum heads, the b and d bodies just get a smaller cam to keep the power levels in check. Iron LT1 heads are what the vortecs where based off of.
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Old 02-17-2012, 06:26 PM
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The stock piece can handle 500hp, porting can tack on a little more, welding and porting can get you way more than enough. You can also convert most sbc intakes to fit on an lt1 which opens up a lot of options.
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Old 02-17-2012, 07:53 PM
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Thank you sir. This points me in the rite direction.
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Old 02-17-2012, 08:12 PM
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How high are you going to spin the motor? The TFS195 cc heads are too small for an engine your size. You would benefit from some Advanced Induction ported stockers, or some AFR 210's or Lloyd Elliott heads. I run a converted sbc single plane itake and a custom elbow. Any competent machine shop can do the intake conversion.
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Old 02-18-2012, 08:03 PM
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I planed on turning the engine 6900-7200rpm. Was doing some digging around yesterday and ran across Lloyed Elliotts name. What i have seen of his products they make good power. But i couldnt find his #. After looking at some of the bigger ci engines it made me wonder, I just may need to stay with a 355CI. becaus i still run the stock TB- MAF- Intake -and 24lbs injectors- with a custom grind cam-a4 trans with 3.73gears -3200 stall. i am sure there is a bit of room for improvement with my current set up. Hell i may have just talked my on self out of building a motor. LOL
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Old 02-19-2012, 05:38 AM
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Lloyd can be reached here:

http://elliottsportworks.com/

If you are going to run the factory pcm, keep in mind that it is done at 7k, it simply can't go any higher than that.
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Old 02-20-2012, 07:52 AM
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If you're serious about 7000 rpm then ported lt1 heads will not work. They'll choke you long before that. You're going to need about a 215cc runner and a 2.02" valve. You'll need to open up the intake to match the heads and adjust the taper accordingly. Stock rods will start giving out around 6400rpm. A ported lt4 setup can work but you can get aftermarket heads for the same or less cost.
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Old 02-20-2012, 06:27 PM
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Quote:
Originally Posted by ap72
If you're serious about 7000 rpm then ported lt1 heads will not work. They'll choke you long before that. You're going to need about a 215cc runner and a 2.02" valve. You'll need to open up the intake to match the heads and adjust the taper accordingly. Stock rods will start giving out around 6400rpm. A ported lt4 setup can work but you can get aftermarket heads for the same or less cost.
AI's 200cc ported GM castings have been well over 7k on 383's and have run in the 9's on properly setup cars. They flow right around 300cfm. Not uncommon to see 450-475 rear wheel horsepower out of them.
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Old 02-20-2012, 09:00 PM
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Quote:
Originally Posted by joelster
AI's 200cc ported GM castings have been well over 7k on 383's and have run in the 9's on properly setup cars. They flow right around 300cfm. Not uncommon to see 450-475 rear wheel horsepower out of them.
Agreed.

Stock LT1 intakes are great up to 400+ hp and can support 500, but porting would make it easier. Edelbrock intakes don't really make magic power, but they are beefy and begging for porting.

LT4 heads/intake raise the ports and make it even easier.
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Old 02-21-2012, 07:36 AM
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Quote:
Originally Posted by joelster
AI's 200cc ported GM castings have been well over 7k on 383's and have run in the 9's on properly setup cars. They flow right around 300cfm. Not uncommon to see 450-475 rear wheel horsepower out of them.
I'm sure they have been used in those apps but they're still too small. A 200cc runner is good for about 6000 rpm, which is why the number 1 head size for street sbc's is an advertised 195 cc's, its ideal for a stock lower end. Flowing 300cfm is fine but your velocities are way too high at 7000 rpm. Flow isn't everything.
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