The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-11-2017, 06:15 PM   #1
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,066
LS build, parts questions

I know that this is not the LS side, but my questions are more to the side of parts manufacture. I plan to have a 5.3 bored 3mm & run a Mahle set of LS1 pistons (4032 alloy spec), for street use. My thoughts are, that if the crank passes magnaflux & cleans up .010/.010, It should be good for a 400 hp engine? The rods I question, as the mill is well seasoned (285,000 miles)! I dont want any junk from China in my Chevy Any advise on rods & maybe a forged crankshaft, would be helpfull. Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Old 01-11-2017, 10:13 PM   #2
sprint_9
Registered User
 
sprint_9's Avatar
 
Join Date: Nov 2012
Location: 9
Posts: 288
Re: LS build, parts questions

If all your doing is boring out, no forced induction I would just stay with new stock parts, maybe find what the best stock upgrade is and go with that.
sprint_9 is offline   Reply With Quote
Old 01-12-2017, 05:14 AM   #3
Nick_R_23
Registered User
 
Nick_R_23's Avatar
 
Join Date: May 2016
Location: Willow, Alaska
Posts: 293
Re: LS build, parts questions

If all you're looking for is 400 hp, your stock bottom end will hold up just fine. They've been shown to hold up to at least 1500 hp with twin turbos, and possibly more. Also, any particular reason for needing to bore out 3mm other than wanting LS1 pistons? Seems like a lot of wasted bores and money for a minor gain in cubes.
__________________
Check out my Alaska built 78/86 C10 stepside! http://67-72chevytrucks.com/vboard/s...d.php?t=706825
Nick_R_23 is offline   Reply With Quote
Old 01-12-2017, 01:32 PM   #4
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,066
Re: LS build, parts questions

The idea of the 3mm overbore, is more for the thoughts of larger valves/ better heads. AFR looks to have a nice set of 210 cc street heads, but they will need a 3.9 bore to clear the 2.02/1.6 valves. Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Old 01-12-2017, 02:24 PM   #5
sprint_9
Registered User
 
sprint_9's Avatar
 
Join Date: Nov 2012
Location: 9
Posts: 288
Re: LS build, parts questions

Quite a few guys run stage 2.5 ported heads on an LS1 or 5.3 for that matter with good results. I think you can get a nice running engine reaching the numbers you want using more of a stock bore and use stock parts for way less money, just the savings in heads alone is quite a bit.

Here is a link on a set of those heads, https://www.texas-speed.com/p-4345-p...-outright.aspx

That link is for an outright set of heads, if your heads are decent enough you could send them in to save even more money if you wanted to.

Just an idea, not sure if you saw anything about this type of option.
sprint_9 is offline   Reply With Quote
Old 01-12-2017, 05:18 PM   #6
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,066
Re: LS build, parts questions

Thanks for that link sprint_9 ! The flow # look good ,as does the pricing Still, they list the # with a 3.910 plate. Will that sized valves clear the stock or .020 over 5.3 bores? Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Old 01-12-2017, 09:06 PM   #7
sprint_9
Registered User
 
sprint_9's Avatar
 
Join Date: Nov 2012
Location: 9
Posts: 288
Re: LS build, parts questions

That 3.910 plate is referencing the flow bench they used to come up with their cfm numbers at a given lift.

If the only reason you are boring is to fit larger valves you might not even need to bore if your block checks out. I would still replace the pistons with that many miles but the rest might be good yet. Pick up a good used set of 243/799 heads and run them or have them ported and run the stock bore. FYI 799 heads come stock on many gen 4 5.3's. http://ls1tech.com/forums/ is a good source for used parts and info specific to ls stuff, not sure if you have been over there yet.

Before you buy or bore anything I would check things over and then call or email whichever company you use and lay out your plan and have them make some suggestions as well. Maybe your stock heads can be worked over, they will be able to tell you. When I bought my cam package it helped me make some decisions on lsa and lift. I bought my stuff from Texas Speed, but there are other places too.

Couple more links for you.

General Head info
http://www.performancetrucks.net/for...g-info-434396/

This one has a stage one more suited for a stock bore, and stage 2 for ls1 bore
http://www.totalengineairflow.com/cu...gm-2/5-3-gm-ls

Set of ported 243/799 heads
https://www.texas-speed.com/p-1391-p...ted-heads.aspx
sprint_9 is offline   Reply With Quote
Old 01-14-2017, 07:23 PM   #8
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,066
Re: LS build, parts questions

Thanks again for the links....lots of info! It is time for me to open the old mill up, & have a look/see Anybody have any ideas on aftermarket con rods/vs bolts & resizing on the stockers? Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Old 01-14-2017, 09:28 PM   #9
Dustytrix
Registered User
 
Join Date: Jan 2012
Location: Petal,Ms.
Posts: 351
Re: LS build, parts questions

I agree with Nick, you will be ok with stock rods and crank, best improvement would be the newer gen 4 floating rods.
Dustytrix is offline   Reply With Quote
Old 01-15-2017, 01:27 AM   #10
clinebarger
Senior Member
 
clinebarger's Avatar
 
Join Date: May 2009
Location: Fort Worth Texas
Posts: 6,138
Re: LS build, parts questions

Start with a 6.0L block, Bore it 0.30" & start with a 4.030" Bore!!
__________________
2006 Chevy 2500HD, LBZ/Allison 1000

2001 Chevy Camaro, L92/4L65E
clinebarger is offline   Reply With Quote
Old 01-15-2017, 07:39 PM   #11
crazy longhorn
Fabricate till you "puke"
 
Join Date: Jun 2002
Location: Ill
Posts: 9,066
Re: LS build, parts questions

I like that idea the best Cline....guess, that I need to make parts out of another truck Longhorn
__________________
69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
crazy longhorn is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:28 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com