5.3 Heads on a 5.7
Thread Starter
Teching In
Joined: Apr 2002
Posts: 48
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From: Mobile
5.3 Heads on a 5.7 What do I need to do????
The story behind this is that I have a 02 GMC truck 5.3 with a low RPM knock caused by nitrous and me being stupid. The motor is coming out AGAIN in the future. I would like to make it into a 5.7. The heads have already had some work done to them and I already have a cam. If I buy a 5.7 block and internals what will I have to do to bolt my top end of my 5.3 to it???
John Cannon
www.sshotrods.com
02 GMC 13.3 (Stock tires) 320RWHP (non tuned)
<small>[ December 22, 2002, 10:31 PM: Message edited by: SSHOTRODSCOM ]</small>
The story behind this is that I have a 02 GMC truck 5.3 with a low RPM knock caused by nitrous and me being stupid. The motor is coming out AGAIN in the future. I would like to make it into a 5.7. The heads have already had some work done to them and I already have a cam. If I buy a 5.7 block and internals what will I have to do to bolt my top end of my 5.3 to it???
John Cannon
www.sshotrods.com
02 GMC 13.3 (Stock tires) 320RWHP (non tuned)
<small>[ December 22, 2002, 10:31 PM: Message edited by: SSHOTRODSCOM ]</small>
Re: 5.3 Heads on a 5.7 Make sure you open up the chambers, the stock 5.3 chamber is around 58cc, we have a CNC program that opens it up to 63cc which yeilds 10.8:1 on 5.7, it also benefits the flow to open it up to 3.9" bore around the valves. If you need the chamber bigger we can do that also. Other then that I believe thats all you would have to do.
Brian
Brian
On The Tree
Joined: Mar 2002
Posts: 136
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From: Shelbyville, KY
Re: 5.3 Heads on a 5.7 Check some of the other threads here on LS1Tech, and I think you'll find that TEA has done a lot of 5.3 heads and has them down pat. I run a set of the 'Stage II' on my 99 vette, and I couldn't be happier. After TEA did their work, the heads bolted right up, and you wouldn't be able to tell them apart from a 5.7 head just by looking at the engine.
Good luck! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Good luck! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Thread Starter
Teching In
Joined: Apr 2002
Posts: 48
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From: Mobile
Re: 5.3 Heads on a 5.7 The heads has already been ported/polished, bigger valves, stiffer springs, etc etc. All I need is the heads modified to bolt onto the 5.7 block..
John Cannon
www.sshotrods.com
John Cannon
www.sshotrods.com
Re: 5.3 Heads on a 5.7 I'm with AllCammedUp.
See Sig
Do your 5.3's have bigger valves installed? The 5.3's need the 2.00 to 2.02 sized intake valve for a 5.7 liter. I thought a I saw a thread where you were asking about that but I could be mistaken.
See Sig
Do your 5.3's have bigger valves installed? The 5.3's need the 2.00 to 2.02 sized intake valve for a 5.7 liter. I thought a I saw a thread where you were asking about that but I could be mistaken.
Thread Starter
Teching In
Joined: Apr 2002
Posts: 48
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From: Mobile
Re: 5.3 Heads on a 5.7 My heads has had some work done to them.. I do have 2.02 1.57 valves and alot of other work done to them. The compression was not changed so there is room for that..
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Verdad Gallardo Thread Starter
Teching In
Joined: Apr 2002
Posts: 48
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From: Mobile
Re: 5.3 Heads on a 5.7 If I send you the bare heads what would you suggest to do to them? They are already ported and have bigger valves. The heads will go onto a 5.7 with a bigger cam. The computer will be tuned once the motor is running.. What would you suggest as far as compression??
Re: 5.3 Heads on a 5.7 John...what happened?
If you need some specifics on doing the 5.3 to 5.7 spec motor let me know...Mark @ AAP is swaping a 5.3 into a s-10 but using all OE 5.7 components.
If you need some specifics on doing the 5.3 to 5.7 spec motor let me know...Mark @ AAP is swaping a 5.3 into a s-10 but using all OE 5.7 components.
