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Forged Engine Talk

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Old 03-12-2014, 07:26 PM
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As some of you may know. I am building a little rcsb. I was planning on boosting the stock lq9 block with head studs, LS9 Gaskets, Triple 12 Cam and Springs. Took it all apart this weekend to only to find out I need a cam bearing. Planning on 15lbs and wanting to it to last. So forged is the way to go. I have not done much internal work on a gas engine. It is a learning curve for me. Got some family that was a gm tech for 30 years so he would help me assemble the short block since this will be the first one I have done.

Is it worth it or should I just get cam bearings and go?
Which pistons and rods?
Why does everyone go to a 370?
ARP Rod studs?
Is it worth it to do any head work?
Is 6.125" stock rod length?
Any info would be great. Talked to a machine shop yesterday and didnt get alot of my questions answered.
Old 03-12-2014, 08:48 PM
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What fuel will you be running? I myself dont like to go much over 13 PSI on pump gas. If you will be running 15 a stronger piston might not be a bad idea. The newer floating rods are stronger than the older rods. If you decide to go with pistons and rods I really like my compstar rods with Wiseco pistons. One thing I would certainly do is file the rings for boost when you have it apart. I only went with a 370 to clean up the cylinders. I have the ebay studs in my engine and like them. Some people swear by ARP, but it really depends on your budget. If you are looking for all out power more flow is better. The stock heads have been proven to support a good amount of power. Stock rods are 6.098.
Old 03-12-2014, 09:35 PM
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Plan on e85.
I already have arp studs.
Where did you pick up your pistons and rods?
Are 370 pistons the same size as 364?

Last edited by Mortiz; 03-12-2014 at 10:35 PM.
Old 03-12-2014, 10:56 PM
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When I first began doing performance modifications I felt like I could just buy it one part at a time and in the end it would be perfect. Unfortunately I have learned that is a good way to waste money and not build true power. first you need to identify what your horsepower goals are. the cu in of the engine is determined mainly by 2 factors stroke and bore, you can achieve a 370 in many different combinations. for na or fi If you plan on going pump gas and never moving you need to consider what compression ratio. Its not just one part or another its all of them put together to build a whole. the heads need to flow the correct amount for your build and your cam also needs to be matched to the flow of the heads that you have and for the type of power you plan on making. If you build an engine for boost with lower compression and a cam that is tuned for boost but you run it as an na motor until you buy the power adder it will be a dog and you will most likely not be satisfied.
Old 03-12-2014, 11:11 PM
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I'd put cam bearings in it and go if I'm being honest. That thing will eat 15 lbs and E85 for a really long time if you tune it correctly.
Old 03-13-2014, 02:00 PM
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If an engine comes apart on the bottom end what are the odds of it wiping out the turbo?
Old 03-13-2014, 04:54 PM
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spend all that money on a forged motor just to be at 15 psi?? waste of money i think, my 110,000 mile 5.3 is eating 14psi every day.
Old 03-13-2014, 09:51 PM
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That is kind of what I was thinking! I wish I had a cam bearing installer so I didnt have to take it to the machine shop.
Old 03-14-2014, 12:58 AM
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Summit?
Old 03-14-2014, 11:26 AM
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http://www.summitracing.com/parts/pro-66794/overview/

??


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