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PAC spring questions #2860437 12/15/20 07:11 PM 12/15/20 07:11 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	PAC 1243 and pac 1343 have same dimensions so. What’s the difference and which one is best for street strip .680 roller? Also Howard’s has a pacaloy 98843, same dimensions, is this the same pac spring sold under Howard’s. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860455 12/15/20 07:50 PM 12/15/20 07:50 PM
Joined: Dec 2013 Posts: 403 Romulus, MI GTS340 mopar
GTS340 mopar Joined: Dec 2013 Posts: 403 Romulus, MI	One is a 1200 series spring and one is a 1300 series spring That Howards spring, Comp 943, Trickflow 16943 are all relabelled PAC 1243s

Re: PAC spring questions [Re: mopar dave] #2860459 12/15/20 08:04 PM 12/15/20 08:04 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	The 1343 is listed as "1.550 Dual Spring for Short Installed Height Roller Cams", the 1343 is listed as a "1.550 Dual". I'm running the 1396 on my small block.

Re: PAC spring questions [Re: justinp61] #2860463 12/15/20 08:17 PM 12/15/20 08:17 PM
Joined: Jan 2003 Posts: 14,491 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,491 So. Burlington, Vt.	The 1300 series “have the latest advancements” for higher endurance. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: PAC spring questions [Re: fast68plymouth] #2860465 12/15/20 08:29 PM 12/15/20 08:29 PM
Joined: Aug 2003 Posts: 43,096 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,096 Bend,OR USA	Originally Posted by fast68plymouth The 1300 series “have the latest advancements” for higher endurance. Take a peak at PAC web site on the differences in those two part #s I've used both in the past on my old Duster, I'm sticking with the 1200 part series now Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: PAC spring questions [Re: Cab_Burge] #2860467 12/15/20 08:34 PM 12/15/20 08:34 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	Ok, looks like the 1200 is good enough for what I’m doing. What application would call for the endurance of the 1300 spring? http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860472 12/15/20 08:49 PM 12/15/20 08:49 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Originally Posted by mopar dave Ok, looks like the 1200 is good enough for what I’m doing. What application would call for the endurance of the 1300 spring? A street/strip solid roller cammed, Indy headed small block that runs mid 6.20's on pump 93.

Re: PAC spring questions [Re: justinp61] #2860477 12/15/20 08:58 PM 12/15/20 08:58 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	What does you cam look like? http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860491 12/15/20 09:29 PM 12/15/20 09:29 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	263/271° @ .050" .711/.719" at the valve. The thought of the 1300 series endurance spring was that it would hold up better on the street.

Re: PAC spring questions [Re: justinp61] #2860502 12/15/20 09:52 PM 12/15/20 09:52 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	That was my thought as well. After I subtract for lash I be about .668” lift if I can make that work with my victor heads and standard valves. I’m told .680 is max lift with this combo per Hughes Engines. May have to switch out the 1.6 arms for 1.5’s. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860532 12/15/20 11:32 PM 12/15/20 11:32 PM
Joined: Aug 2003 Posts: 43,096 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,096 Bend,OR USA	The cam that is in my old S/P motor with the Eddy Victor M.W. heads has a little over .700 net lift with the Harland Sharp 1.56 ratio rocker on it, it has .120+ V to P on both valves and it is right at .080 from coil bind with the PAC valve springs I put in that motor. I did replace the springs, retainers and keepers to a set of Comp Cams 10 degree tool steel retainers and keepers with lash caps Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: PAC spring questions [Re: Cab_Burge] #2860553 12/16/20 12:24 AM 12/16/20 12:24 AM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	That part looks good. Hughes says my Victor heads with standard valves only allow 660-680 lift max. I don't know for sure. I believe my current springs are 1.550 flat tappet springs and hoping to reuse the spring cups, titanium retainer with locks on the new Pac springs. I see CNC motorsports has the 98543(1243) pacaloy springs for $280. UDHarold cam has been ordered, so i'm on my way to roller after the T ram test run in the spring. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860621 12/16/20 09:30 AM 12/16/20 09:30 AM
Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,351 Marion, South Carolina [><]	I run the PAC 1243 on my hemi and have been very pleased w/ them. Dwayne recommended them 14 years ago. .672"/.651", 276°/284° at .050" solid roller. Last edited by an8sec70cuda; 12/16/20 09:30 AM. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: PAC spring questions [Re: an8sec70cuda] #2860649 12/16/20 10:32 AM 12/16/20 10:32 AM
Joined: Mar 2006 Posts: 9,813 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,813 MI, usa	I believe the 1300 series are polished. Mine runs the 1224 Pac.. When swapped at 200 passes zero pressure loss. Current set has 300 passes. Stainless 2.25 x 11/32 intake valve. 285/292@.050, .800. 7100 every pass. Doug Last edited by dvw; 12/16/20 10:34 AM.

Re: PAC spring questions [Re: dvw] #2860653 12/16/20 10:42 AM 12/16/20 10:42 AM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	Sounds like the 1243 spring is plenty for racing. I do a lot of street so was just looking at 1343 as well. Thanks guys http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860656 12/16/20 10:44 AM 12/16/20 10:44 AM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	Originally Posted by mopar dave That part looks good. Hughes says my Victor heads with standard valves only allow 660-680 lift max. I don't know for sure. I believe my current springs are 1.550 flat tappet springs and hoping to reuse the spring cups, titanium retainer with locks on the new Pac springs. I see CNC motorsports has the 98543(1243) pacaloy springs for $280. UDHarold cam has been ordered, so i'm on my way to roller after the T ram test run in the spring. You can get more installed height using +.050 retainers and locks. My 511 is over .700 net lift with standard length valves in my Victors. Hughes told me the same thing as you when I was figuring out the IH and camshaft. The problem I ran into was getting the roller tip centered on the valve at that lift. I used a b3 kit to correct it. Engine made peak hp around 7000-7100.

Re: PAC spring questions [Re: Jeremiah] #2860670 12/16/20 11:11 AM 12/16/20 11:11 AM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	Wow, what size cam did you put in it? I went slightly conservative with 269/275@50 on 108. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: PAC spring questions [Re: mopar dave] #2860673 12/16/20 11:15 AM 12/16/20 11:15 AM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	I will dig out the specs. It is a little different that what you will want being a power adder deal with a small tire and a stick. .740 gross, 280's @ .050, 111 LSA from Mike Jones. Maded 686hp first pull. 750 on the last pull without n20.

Re: PAC spring questions [Re: mopar dave] #2860708 12/16/20 12:26 PM 12/16/20 12:26 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Isky Tool Room is all you need ........Wink Wink ..... 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: PAC spring questions [Re: Thumperdart] #2860730 12/16/20 01:03 PM 12/16/20 01:03 PM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	I used ISKY RAD-9998 1.600 OD springs with a 2.00ish IH.

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