![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Nov 2004
Posts: 18
|
Will a 6in rod work with a stock stroke 350?
Hello,
I found a great deal on a set of eagle 6in rods but i dont want a stroker i already have a forged 350 crank and a stock 350 block. What will i need to make these 6in rods work in this block, different pistons, machine work or notching the block? let em know asap thanks chris |
![]() |
![]() |
![]() |
#2 |
Senior Member
![]() Join Date: Apr 2001
Location: Alexandria, MN
Posts: 1,462
|
the crank makes the bigger stroke, not the rods... the displacemt of you motor will actually be the same, well that is until your pistons try to knock your head out through the hood
![]() --Mike
__________________
63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's |
![]() |
![]() |
![]() |
#3 |
JUNK COLLECTOR!!!!!
Join Date: Jan 2005
Location: Spokane, WA
Posts: 514
|
yes, you can put 6 inch rods in a 350. you need to make sure that you buy 350 pistons for a 6" rod. this will give you more torque over a 350 that is exactly the same with stock rods, but it also increases your rotating mass, so your rpm max will drop a little bit. other than the different pistons, you can slap those 6" rods right in.
__________________
![]() ![]() The dark side! 2000 XLT PSD F-250 4x4! Offroad package 1970 C10 Short-step soon to be short fleet, maybe? Corvette in truck's clothing in work! Corvette IFS, IRS, TPI and Doug Nash 4+3 |
![]() |
![]() |
![]() |
#4 |
Senior Member
![]() Join Date: Apr 2001
Location: Alexandria, MN
Posts: 1,462
|
yeah genIII is right about the different pistons you can use... just had to chime back in
![]() --Mike
__________________
63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's |
![]() |
![]() |
![]() |
#5 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
|
I wouldn't hold my breath waitning to "feel" a performance difference...but from a strength/reliability stand-point, you can't go wrong with this. The longer rods are easier on the cylinder walls, bearings and even wrist pins. Nothing wrong with the 5.7s, but if you can get a "deal" that won't cost much more than rebuilding the stockers, why not?
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Oct 2004
Location: saskatoon, planet earth
Posts: 691
|
I don't know squat about rod lengths & stuff. But I do know about " deals " . I love deals, but a lot of the deals I've got over the years often meant more frustration and sometimes more money in the long run for something that wasn't exactly what I wanted. A wise man once said " A bargain is something you don't need at a price you can't refuse". Good luck with your motor.
__________________
I got a bench seat baby, you don't have to sit over there. |
![]() |
![]() |
![]() |
#7 |
Senior Member
![]() Join Date: Jun 2003
Location: Panola County Texas
Posts: 401
|
These are two sites I found on searching rod length on the net, good info
http://www.victorylibrary.com/mopar/rod-tech-c.htm http://www.truckpulls.com/Tech%20Fil...20Prepping.htm |
![]() |
![]() |
![]() |
#8 | |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
|
Quote:
![]() oh for a deal..check this out http://www.cnc-motorsports.com/product.asp?ProdID=4187
__________________
It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA Last edited by bigjimzlll; 07-31-2005 at 10:07 PM. |
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Nov 2004
Posts: 18
|
i did some more research and found a set of 5.7in h-beams for fairly cheap. Gonna try to build the motor for spray. I spun 2 rod bearings and 1 main the pther day. Gonna get a forged crank, h-beam rods and some forged pistons. Not sure on the compression ratio yet thinkin high 9's to mid 10's any info on that would be greatful?
Also it has a 125 shot now it will prob end up with a 200-250 shot not sure yet. gonna get a set of aluminum double humps or the new cast heads from jegs or summit not really sure on the heads i might even go with vortec heads. any info will be greatly appreciated thanks chris |
![]() |
![]() |
![]() |
#10 |
Java Mechanic
Join Date: Jun 2005
Location: Martinsburg, WV
Posts: 6,764
|
Longer connecting rods provide for a greater moment arm which results in greater tourqe. There is not a huge difference in mass (and that will probably be compensated for by the new pistons anyway) but like any lever system, you can use a short moment arm to gain velocity or a long moment arm to gain tourque. A connecting rod may not look much like a lever but that is exactly what it (in combination with the crank journel) is.
There is a set amount of energy released in any given engine. Making a mechanical change such as this does not change the net energy release, it changes how it is transfered from the reciprocating action to the rotational action.
__________________
Keith 11 Lincoln MKT -- Momma's wagon ![]() 13 G37xS -- middle age crazy car 68 C20 Fleetside -- RIP Decorating the whole town up at a cost of $27 .... |
![]() |
![]() |
![]() |
#11 |
Captain Ed
Join Date: Jul 2003
Location: Port Charlotte, FL
Posts: 1,241
|
Long rods can drastically lower rotating mass. Generally the shorter the compressed height of the piston the lighter the piston will be. Since the piston is out at the end of the rod is is the most effective place to lose rotating weight. Think about a rod/piston like a hammer, a light handle with a heavy head takes a lot of work to swing but is very destructive. A slightly heavier handle with a lighter head is a lot easier to swing and is less destructive. In an engine, less destructive is GOOD.
![]() |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Apr 2004
Location: Houston.
Posts: 75
|
You will have to get the block notched. Most machine shops will have a template so they don't have to notched to fit.
__________________
'05 Silverado '02 Avalanche '85 C10 '71 C10 '51 3100 |
![]() |
![]() |
![]() |
#13 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
|
Block should not have to be notched just for longer rods. If stroking, then yes, but you are using 3.48 stroke.
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
![]() |
![]() |
![]() |
#14 |
Registered User
Join Date: Nov 2004
Posts: 18
|
Just using the stock stroke but am getting a forged crank. I am looking at sppd pro forged pistons but cant decide on the comp to get? Again this motor will be bottle fed on the track and maybe every now and then on the street as well just depends on the victim. Also i am torn to decide what bearings i want clevite or sealed power i have heard great things about both but need someone with firsthand experience with it
thanks chris |
![]() |
![]() |
![]() |
#15 |
Captain Ed
Join Date: Jul 2003
Location: Port Charlotte, FL
Posts: 1,241
|
On a sbc 400 some notching needs to happen when using H beam rods, but for the 3.48 stroke, I can't imagine it would be necessary.
|
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Apr 2004
Location: Houston.
Posts: 75
|
My Malibu block is notched. It's stock stroke with the Eagle h-beam 6 inch. With the longer rod, the side does come closer to the block. The machine shop used the template and spent 5 minutes to take care of any posibilities of the rod coming too close. I guess to be on the safe side.
__________________
'05 Silverado '02 Avalanche '85 C10 '71 C10 '51 3100 Last edited by Autometer; 08-02-2005 at 10:19 PM. |
![]() |
![]() |
![]() |
Bookmarks |
|
|