Author Topic: 250 inline 6 experts need some advice  (Read 5537 times)

Offline Lowhoe775

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250 inline 6 experts need some advice
« on: April 07, 2015, 09:35:56 PM »
Looking to upgrade my carb intake and get some LT headers. Anyone know if I can do this to my set up, I know some inline 6 you can't.

Offline ehjorten

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Re: 250 inline 6 experts need some advice
« Reply #1 on: April 08, 2015, 08:59:36 AM »
Kinda hard to tell in the pictures, but it does look like you have the head with the integral cast intake attached to it.  If you can't unbolt the intake manifold from the head, then yes...you can't change the intake without getting a non-integral head.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #2 on: April 08, 2015, 01:15:12 PM »

Kinda hard to tell in the pictures, but it does look like you have the head with the integral cast intake attached to it.  If you can't unbolt the intake manifold from the head, then yes...you can't change the intake without getting a non-integral head.
thanks I will check it out today see if the intake un bolts separate.

Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #3 on: April 08, 2015, 01:30:29 PM »

Kinda hard to tell in the pictures, but it does look like you have the head with the integral cast intake attached to it.  If you can't unbolt the intake manifold from the head, then yes...you can't change the intake without getting a non-integral head.
so if it's like the pic above it is not possible is this correct?

Offline mjmhomes

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Re: 250 inline 6 experts need some advice
« Reply #4 on: April 08, 2015, 06:05:26 PM »
This is a 250 6 I am working on


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Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #5 on: April 08, 2015, 09:07:20 PM »

This is a 250 6 I am working on


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looks real good. You have any comparisons between old set up this set up performance wise?

Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #6 on: April 08, 2015, 09:09:06 PM »

This is a 250 6 I am working on


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how do the linkages on the carb work, looks like the carb is side ways??

Offline mjmhomes

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Re: 250 inline 6 experts need some advice
« Reply #7 on: April 08, 2015, 09:10:48 PM »
Longer cable and a lot of work trying to figure out linkage, I will add a pic of the linkage.


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Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #8 on: April 08, 2015, 09:11:53 PM »

Kinda hard to tell in the pictures, but it does look like you have the head with the integral cast intake attached to it.  If you can't unbolt the intake manifold from the head, then yes...you can't change the intake without getting a non-integral head.
took some more pics. Looks like there is a gasket in between the intake

Offline mjmhomes

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Re: 250 inline 6 experts need some advice
« Reply #9 on: April 08, 2015, 10:05:18 PM »
You look to be in luck, I had to find another head that didn't have the intergral intake. I don't have any number or ideas on the performance increase as its waiting on exhaust pipes, don't want to burn a valve ruining it with just headers.


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Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #10 on: April 08, 2015, 11:08:07 PM »

You look to be in luck, I had to find another head that didn't have the intergral intake. I don't have any number or ideas on the performance increase as its waiting on exhaust pipes, don't want to burn a valve ruining it with just headers.


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once you get it running update us in yours. Are you doing the lump port on your head or is it already done?

Offline Lowhoe775

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Re: 250 inline 6 experts need some advice
« Reply #11 on: April 08, 2015, 11:15:12 PM »

You look to be in luck, I had to find another head that didn't have the intergral intake. I don't have any number or ideas on the performance increase as its waiting on exhaust pipes, don't want to burn a valve ruining it with just headers.


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one more question when installing new intake and headers do they share the same bolts like in the picture I have. That's how it looks like it to me?

Offline mjmhomes

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Re: 250 inline 6 experts need some advice
« Reply #12 on: April 09, 2015, 08:01:03 AM »
I didn't do the lump port kit as I planned, we did bigger valves and a cam, didn't think it was needed till you go for major performance upgrades. This is going to be a daily driver for my daughter. The machine shop had never seen the lump kit so I sided with not doing it.


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