sled pullin 6.0 mods?
Thread Starter
Teching In
Joined: Jan 2010
Posts: 9
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From: freeport illinois
sled pullin 6.0 mods? Picked me up an lq4 with 165000 miles(replacing my 212,000 iron headed one)with 317 heads for 250 bucks. Pulled heads and pan has a lot of gunk but no metal chunks can still see the cross hatching in all the cylinders.. I want the most bang for the buck I'm thinking flat tops,heads shaved and a cam and roller rockers with 8.1 injectors and a set of shorty headers.. any thoughts on specific parts,or how far to shave the heads? Port n polish are out of the budget this year... Would like to be street friendly and be reliable as I use it to tow my trailer long distances. Thanks!
Flat top pistons for compression for sure. You can safely mill up to .030 off your heads for added compression.
As for roller rockers save your money. Stock rockers with the trunion upgrade are plenty good for your needs.
I always say go longtubes for headers, but that may not be an option for you.
As for roller rockers save your money. Stock rockers with the trunion upgrade are plenty good for your needs.
I always say go longtubes for headers, but that may not be an option for you.
Thread Starter
Teching In
Joined: Jan 2010
Posts: 9
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From: freeport illinois
So scrap the rollers..long tubes are an option its just gettin them to hook to the factory system its dual 3 inch from the factory to the muffler. I see they mak an off road y pipe for a 5.3 to ise long tubes. Can i use it and swap over to a 4 or 5 inch single exhaust?
10 Second Club
Joined: Jan 2010
Posts: 2,317
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From: Hurley, VA
You don't need a 5" exhaust. You could do a 4" single but if you all ready have dual 3" I'd stay with it and save some money. Any exhaust shop should be able to bend 3" pipe enough to hook your exhaust back up. The 8.1 injectors I'm not sure about what size they are but no matter what if you change them you'll have to get a tune for them. I would go back with flat tops, mill the 317s you have, port them some, and run something like a 228r cam. That'll leave you plenty of low end in a 6.0. Your probably going to want a stall to. I'm not a auto guy but I would imagine somewhere in the 2800 range would be good for that set up.
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Are you sure you will even need bigger injectors?
As said the trunnion upgrade on stock rockers is a better option for you and a LOT cheaper.
Now keeping in mind this is a truck used for what daily driving and towing?
I wouldn't do flat tops unless you can do it free or damned near free.
Stay very mild on the cam duration.
Maybe take the money you save by doing the trunnion upgrade and have the heads refurbished/milled. http://advancedinduction.com/LSX/AiLSx243GMPRHead.php
You are not necessarily looking for WOT max power so I think shorties are an OK option with stockish exhaust. IMO the gains from longtubes and bigger exhaust system would likely be at high rpms you wont often see.
The exhaust would be easier to go back and do later should you feel the need, where a quality rebuild on the heads would be a big deal after the engine is installed.
The only potential snag I see is with 165K on the clock it might need guide work. Most guys and even vendors prefer the trunnion upgrade on stock rockers till going very aggressive or aftermarket heads with bronze guides. Stockers are light and strong, the trunnion upgrade solves fulcrum bearing issues and the price is great. If you found it needed bronze guides it would then likely be cheaper to just get low mileage heads and do the trunnion upgrade and still come out cheaper than bronze guides and roller rockers because the bronze guides will wear out again and aftermarket rockers are expensive.
As said the trunnion upgrade on stock rockers is a better option for you and a LOT cheaper.
Now keeping in mind this is a truck used for what daily driving and towing?
I wouldn't do flat tops unless you can do it free or damned near free.
Stay very mild on the cam duration.
Maybe take the money you save by doing the trunnion upgrade and have the heads refurbished/milled. http://advancedinduction.com/LSX/AiLSx243GMPRHead.php
You are not necessarily looking for WOT max power so I think shorties are an OK option with stockish exhaust. IMO the gains from longtubes and bigger exhaust system would likely be at high rpms you wont often see.
The exhaust would be easier to go back and do later should you feel the need, where a quality rebuild on the heads would be a big deal after the engine is installed.
The only potential snag I see is with 165K on the clock it might need guide work. Most guys and even vendors prefer the trunnion upgrade on stock rockers till going very aggressive or aftermarket heads with bronze guides. Stockers are light and strong, the trunnion upgrade solves fulcrum bearing issues and the price is great. If you found it needed bronze guides it would then likely be cheaper to just get low mileage heads and do the trunnion upgrade and still come out cheaper than bronze guides and roller rockers because the bronze guides will wear out again and aftermarket rockers are expensive.
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Teching In
Joined: Jan 2010
Posts: 9
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From: freeport illinois
Texas speed has a 228 I was eye ballin a complete kit with springs and push rods,as I run it now I turn like 4500rpm down the track,truck pulls hard from like 2300 to 3800 and I'm gettin an efi live tune regardles, any idea on compression ratio it I shave the 317s .030 and run flat tops? I'm goin to keep the truck.I.take and maybe port n polish the throttle body.. am I on the right path with supporting one mod with another at least? I appreciate the feed back!
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
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From: Katy, TX
get long tubes. Although you will have to get custom welds and piping to keep the dual 3". Also, you'll want to ditch the cats.
Here's a few pointers on the LT header install:
http://www.performancetrucks.net/for...00-4x4-508100/
Here's a few pointers on the LT header install:
http://www.performancetrucks.net/for...00-4x4-508100/
Teching In
Joined: Jul 2012
Posts: 42
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Not sure if this will help but i am also building a pulling truck. It will be in the stock class and be a dd. My motor is at my engine builder right now. It has 317 heads that i just milled clean and a set of 4.003 bore +3cc dome wiseco pistons. This will give me 10.5:1 comp. and room for more later with the smaller heads. Stock rebuilt bottom end. Im going to put a 228r cam with stock rockers with upgrade.
If you put domed Wiscos in that isn't a If spending the coin on aftermarket pistons and balancing I would certainly do rods just to save the hassle of dealing with the stockers.
Stock rebuilt bottom end.
Teching In
Joined: Jul 2012
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no prob. it will be close to 2000 for parts a labor. Thats new springs,pistons,gasket kit top and bottom, bearings,and few other parts.
They did a comp. valve job and assm. the heads and the bottom end. If there is any other thing i can help with let me know but im new to these engines. I had a 72 chevy cheater stock running a 502 big block before this one.
They did a comp. valve job and assm. the heads and the bottom end. If there is any other thing i can help with let me know but im new to these engines. I had a 72 chevy cheater stock running a 502 big block before this one.
I've got a torque cam that would work well also, I do two different versions:
223/231 .610/.617" 110+3
227/235 .614"/.621" 110+3
I like the smaller one for your application. Long tube headers would be much more beneficial than shorties. With the small amount of duration you'll have @.006 with a cam geared for your needs I'd shoot for 11.3-11.5:1 compression. With a small cam your dynamic will be well where it needs to be at 11.5:1 static compression.
223/231 .610/.617" 110+3
227/235 .614"/.621" 110+3
I like the smaller one for your application. Long tube headers would be much more beneficial than shorties. With the small amount of duration you'll have @.006 with a cam geared for your needs I'd shoot for 11.3-11.5:1 compression. With a small cam your dynamic will be well where it needs to be at 11.5:1 static compression.
