SB Mopar Valve springs?

George Mirza · 08-13-2010, 07:07 AM

Looking for a good valve spring for a 340 stocker motor. This is for a stock type lifter, not Schubeck/Smith.

GTX JOHN · 08-13-2010, 08:09 PM

Isky 3105 (I think) 1.47 od set up @ 165 lb at 1.68......may need to shim again after 100 passes. If you need more info
racer7411@yahoo.com John Irving

Jeremy · 08-14-2010, 03:48 PM

I have used the Howards 98215 "Zero Tolerance 1.25 Drop in springs, they have good pressures, and there a small diameter Chevy spring that give lots of rocker arm clearance.
Good Luck

older racer · 08-14-2010, 07:27 PM

hi, the comp cams, 926 -16 is a tough spring, fits great in a 340. has a high spring rate.

George Mirza · 08-14-2010, 08:00 PM

Thanks guys,

John
I have used the Isky 3105 in the past, I got them from Don Studley. He used to coat them. They seem ok, but I'm looking for a little bit more pressure, Isky catalog put them at #130@1.700 and #320@1.200. I miss talking with Don, he was a nice man.

Old Racer,
I have been using the Comp 926, but I put a new set in at the beginning of the season, set them up the same as the last ones and they must be junk, lost a good 500-700 finish line rpm from the old springs. Unfortunately I didn't test them before I put them in. I wonder if anyone else has had a problem with this spring?

Jeremy,
Did you have to machine the spring seats to get the Chevy spring to fit?

Thanks again,
George Mirza 1236 D/SA '71 340 Duster

Jeremy · 08-15-2010, 07:59 AM

No machining, just shimed the bottom step level. These springs last well and have a low height set up. You can get about any pressure you would like.

Many small block Chevys are using this spring with success in Stock.

At the time I was using these I had a longer than stock valve, I'm not sure how the heights will work out with stock length valves.

Jim Wahl · 08-17-2010, 08:33 AM

Comp #926-16 are the ones you want. They take a licking and keep on ticking! They are long lasting and dependable. Jim

mitch kight · 08-21-2010, 01:10 PM

The best spring for a small block mopar is the Comp 904. If the pressure is below 200lbs on the seat, they need to changed. I like around 230 seat with 475 open is good. You really need a pair of Smith lifter's for a mopar so no cam wipes. Lifters are cheap compare to cost of clean up!

08-23-2010, 07:45 AM

I also like the Howards 98215 "Zero Tolerance 1.25 Drop in springs. They allow enough coil bind clearance to set the seat pressure almost anywhere you would like to run it.

Chris

231-740-5862

Jim Bailey · 08-23-2010, 04:20 PM

Give Don Little a call .......

08-13-2010, 08:09 PM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,708 Likes: 2,734 Liked 2,398 Times in 679 Posts	Re: SB Mopar Valve springs? Isky 3105 (I think) 1.47 od set up @ 165 lb at 1.68......may need to shim again after 100 passes. If you need more info racer7411@yahoo.com John Irving

08-14-2010, 07:27 PM	#4
older racer Member Join Date: Aug 2010 Posts: 208 Likes: 13 Liked 63 Times in 24 Posts	Re: SB Mopar Valve springs? hi, the comp cams, 926 -16 is a tough spring, fits great in a 340. has a high spring rate.

08-14-2010, 08:00 PM	#5
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: SB Mopar Valve springs? Thanks guys, John I have used the Isky 3105 in the past, I got them from Don Studley. He used to coat them. They seem ok, but I'm looking for a little bit more pressure, Isky catalog put them at #130@1.700 and #320@1.200. I miss talking with Don, he was a nice man. Old Racer, I have been using the Comp 926, but I put a new set in at the beginning of the season, set them up the same as the last ones and they must be junk, lost a good 500-700 finish line rpm from the old springs. Unfortunately I didn't test them before I put them in. I wonder if anyone else has had a problem with this spring? Jeremy, Did you have to machine the spring seats to get the Chevy spring to fit? Thanks again, George Mirza 1236 D/SA '71 340 Duster

08-15-2010, 07:59 AM	#6
Jeremy Junior Member Join Date: Dec 2002 Posts: 95 Likes: 0 Liked 1 Time in 1 Post	Re: SB Mopar Valve springs? No machining, just shimed the bottom step level. These springs last well and have a low height set up. You can get about any pressure you would like. Many small block Chevys are using this spring with success in Stock. At the time I was using these I had a longer than stock valve, I'm not sure how the heights will work out with stock length valves. Last edited by Jeremy; 08-15-2010 at 08:10 AM. Reason: Forgot something

08-17-2010, 08:33 AM	#7
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,843 Likes: 663 Liked 682 Times in 128 Posts	Re: SB Mopar Valve springs? Comp #926-16 are the ones you want. They take a licking and keep on ticking! They are long lasting and dependable. Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association.

08-13-2010, 07:07 AM	#1
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	SB Mopar Valve springs? Looking for a good valve spring for a 340 stocker motor. This is for a stock type lifter, not Schubeck/Smith.

08-14-2010, 03:48 PM	#3
Jeremy Junior Member Join Date: Dec 2002 Posts: 95 Likes: 0 Liked 1 Time in 1 Post	Re: SB Mopar Valve springs? I have used the Howards 98215 "Zero Tolerance 1.25 Drop in springs, they have good pressures, and there a small diameter Chevy spring that give lots of rocker arm clearance. Good Luck

08-21-2010, 01:10 PM	#8
mitch kight Junior Member Join Date: Apr 2009 Location: North Carolina, Ohio Posts: 95 Likes: 14 Liked 38 Times in 13 Posts	Re: SB Mopar Valve springs? The best spring for a small block mopar is the Comp 904. If the pressure is below 200lbs on the seat, they need to changed. I like around 230 seat with 475 open is good. You really need a pair of Smith lifter's for a mopar so no cam wipes. Lifters are cheap compare to cost of clean up!

08-23-2010, 07:45 AM	#9
Chris Hardy Guest Posts: n/a	Re: SB Mopar Valve springs? I also like the Howards 98215 "Zero Tolerance 1.25 Drop in springs. They allow enough coil bind clearance to set the seat pressure almost anywhere you would like to run it. Chris 231-740-5862

08-23-2010, 04:20 PM	#10
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 673 Likes: 15 Liked 547 Times in 93 Posts	Re: SB Mopar Valve springs? Give Don Little a call .......

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