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370ci - change heads &cam?

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Old Jun 27, 2007 | 11:50 AM
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Default 370ci - change heads &cam?

I've been considering a rebuild just for the heck of it. I can get a good6.0L truck crank and block and do the rebuild myself. But my question is about h/c. Is my g5x3 too small? And with my heads I wasthinking about just hand smoothing the ports, but they're milled .030". Would that increase my compression too much? What can I do about that?
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Old Jun 27, 2007 | 12:20 PM
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Both head and cam will work great. Just get some -2cc pistons
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Old Jun 27, 2007 | 12:27 PM
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Originally Posted by LS1rulz
Is my g5x3 too small?
No. It will have slightly better street manners due to the additional cubes.

Originally Posted by LS1rulz
And with my heads I wasthinking about just hand smoothing the ports, but they're milled .030". Would that increase my compression too much? What can I do about that?
I would never put cruddy old heads on a new short block with out at least doing a valve job and seals, new springs and pressure testing the castings. Considering what all that costs, you'd probably be better off buying a new pair of cnc ported LS2/LS6 heads from PRC or Patriot. You'd be money ahead and it would be a big performance gain.

Originally Posted by LS1rulz
Would that increase my compression too much? What can I do about that?
Use custom pistons. Most of the sponsors on this site that sell pistons can probably tell you what pistons you need if you tell them the rest of your combo. They'll need to know intended use (n/a, boost, spray), deck height, gasket thickness, chamber cc, desired compression ratio...
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Old Jun 27, 2007 | 12:37 PM
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He has Livernois 243 stage 2s, far from cruddy old heads don't you think?
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Old Jun 27, 2007 | 02:45 PM
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LOL, I was thinking that, PredZ. They,re only 8 months old.
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Old Jun 27, 2007 | 02:54 PM
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Originally Posted by PREDATOR-Z
He has Livernois 243 stage 2s, far from cruddy old heads don't you think?
To the OP: How do you like those heads, btw? I am strongly considering them when I decide to get a new set...

-J
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Old Jun 27, 2007 | 05:46 PM
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I'd gladly buy them again. As for taming my cam, it's plenty tame. That's why I was thinking about it being too small on a 370... it's perfect on my 346.
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Old Jun 28, 2007 | 06:04 AM
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I ran a 232/234 113 in my 370 with 12:1 SCR and made a healthy 453rwhp and 423 rwtq.

The X3 is a bit bigger, it is a good cam for a 370.
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Old Jun 28, 2007 | 06:48 AM
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Originally Posted by PREDATOR-Z
He has Livernois 243 stage 2s, far from cruddy old heads don't you think?

Guess I over looked that. My bad. Yeah, they'd work pretty well.
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Old Jun 28, 2007 | 09:30 AM
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Sweet. Thanks for the info guys.
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Old Jun 28, 2007 | 03:38 PM
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Using this calculator and my 59cc heads and a .042" Cometic, I'm finding a SCR of 12.5. Not good.

http://www.csgnetwork.com/compcalc.html

Anybody have another calculator?
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Old Jun 28, 2007 | 05:10 PM
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Sure do... LS1 (thanks pianoprodigy!)

-J
Attached Files
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Old Jun 28, 2007 | 08:36 PM
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Originally Posted by lastcall190
Sure do... LS1 (thanks pianoprodigy!)

-J
That thing is awesome! I just did some messing around with it real fast.
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Old Jun 28, 2007 | 08:40 PM
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Originally Posted by Beaflag VonRathburg
That thing is awesome! I just did some messing around with it real fast.
No doubt... pianoprodigy made this them seemingly disappeared I tinkered with this thing for hours before I delved into my cam hunt.

-J
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Old Jun 29, 2007 | 12:22 AM
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Originally Posted by lastcall190
No doubt... pianoprodigy made this them seemingly disappeared I tinkered with this thing for hours before I delved into my cam hunt.

-J
Yeah, he kind of pulled a vanishing act. I haven't seen him around here in a long time either.
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Old Jul 3, 2007 | 09:11 PM
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So how would my cam/heads/intake turn out on a 383? 408? I figure they'd be too crappy for a 408... it'd have a dyno graph like a Duramax probably. Just curious, as I think I've come across a good deal on a stroker crank to use for my buildup.
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