Help with Nitrous 4.8 build

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Jan 21, 2012 | 11:18 AM

buddhaz06

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From: Pittsburg, Kansas

Help with Nitrous 4.8 build

Hi I'm currently trying to get ideas for a nitrous setup 4.8. Stock 80k mile short block, what heads and compression should I go with? I was thinking either a 243 head or milled 317's id like to spray 175-250. And also I see nitrous cams are in the .600 lift range, big 240-260 duration and rpm range of 2400-7200. Would a cam like that be way too big for a 4.8? Plan on running a victor jr with plate and elbow. Any input would be great! Only thing I have now is the 4.8 and I have 2 sets of 862 heads and some 317's

Jan 22, 2012 | 02:55 AM

Fbodyjunkie06

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From: Greensboro, NC

I wouldn't use 317's on a 4.8. 862's may be no problem if the valves are stock, I'd get a set of older 5.3 heads with the smaller intake valve.

Jan 22, 2012 | 11:34 AM

dnkynrbk

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If you can find a set of LS6 243 heads that would be best.

Jan 22, 2012 | 12:01 PM

buddhaz06

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Ya I think 243's would be the way to go

Why smaller 5.3 heads? Dont I want bigger valves?

Jan 22, 2012 | 06:25 PM

Fbodyjunkie06

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Bore size and valve shrouding

Jan 23, 2012 | 05:54 PM

Firehawk441

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Quote:

Originally Posted by buddhaz06

Ya I think 243's would be the way to go

That's what I would use. I wouldn't even consider a 5.3 head.

Jan 23, 2012 | 08:44 PM

Fbodyjunkie06

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Quote:

Originally Posted by Firehawk441

That's what I would use. I wouldn't even consider a 5.3 head.

Because of the smaller valve?

Is this going to be a strictly nitrous motor?

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Jan 24, 2012 | 12:08 AM

buddhaz06

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From: Pittsburg, Kansas

It'll be nitrous at the track. Want it t have a lil get up n/a

Jan 25, 2012 | 09:38 AM

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Fbodyjunkie06

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From: Greensboro, NC

What CR would the 5.3 heads give you? Like I said at first I'd use the 5.3 heads on a 4.8.

Is this going to be a track only car?

Jan 25, 2012 | 04:17 PM

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Nitro Dave's Nitrous Outlet

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From: Waco, TX

Im not sure what head would be the best option on the 4.8 so I am of no help there. I did want to say if you decide to go with a 243 head I have a set of ported and extremely milled heads I would make you a good deal on.

https://ls1tech.com/forums/texas-cla...243-heads.html

Jan 25, 2012 | 05:03 PM

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Firehawk441

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Quote:

Originally Posted by Fbodyjunkie06

Because of the smaller valve?

Accually, after re-reading the OP's 1st post, I'll take what I said back.
The OP wants a stock, 80,000 mile 4.8 with a Vic Jr. Intake and 240 + duration.
I'd rather not involve myself with this.

Jan 25, 2012 | 07:48 PM

#13

buddhaz06

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From: Pittsburg, Kansas

Quote:

Originally Posted by Fbodyjunkie06

What CR would the 5.3 heads give you? Like I said at first I'd use the 5.3 heads on a 4.8.

Is this going to be a track only car?

well the 5.3 heads and 4.8 heads are the same. 862's. stock is 9.5:1. i figure mill them just a little, and get a thinner mls gasket. prolly be between 9.7-10:1.

yes pretty much track only. it'll be driven to track, roughly 15 miles each way. im leaning towards a 580-590 lift, and iwant the victor jr because i want a metal intake and i see it being the best option, because i can run a carb style nitrous plate.

243 heads will lower my compression a lil much for me. i didnt realize they were 9.5:1 stock. a friend of mine made 305rwhp with a 224r cam and headers with his 4.8 pickup. and ive heard of several guys running 200 shot on 100% stock trucks.

Jan 27, 2012 | 09:05 AM

#14

Nitro Dave's Nitrous Outlet

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From: Waco, TX

Quote:

Originally Posted by Firehawk441

Accually, after re-reading the OP's 1st post, I'll take what I said back.
The OP wants a stock, 80,000 mile 4.8 with a Vic Jr. Intake and 240 + duration.
I'd rather not involve myself with this.

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Help with Nitrous 4.8 build

Help with Nitrous 4.8 build

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