SStroked 410

best spring for .620/.624 lift?

Crane, comp or Patriot performance has their own dual spring?

I would hope one of these could last 30k miles before the need of new ones

Cstraub

iTrader: (1)

You'll need something in the 1.500" OD and around 140# on the seat for any longevity. We generally get around 100 hours on a marine application with a simlar size hyd roller before springs need to be changed. Thats 10K in car miles.

Chris

Chicago Crew UnderBoss

iTrader: (1)

For that bad boy cam you'll be running in your stroker 410 car i would go with the isky dual springs that MTI uses and i am running in my 427 C5R based motor!!!

SStroked 410

thanks

would like to hear what some other strokers are running?

Sam88Gta1

iTrader: (13)

The PP spring is that same as the REV and Ferrera,only treated.

Keith

Isky Tool Room Springs

SStroked 410

are you sure?

I'll call them just to make sure

TVWilkes

The Patriot spring is not the same as REV or Ferrea.

VINCE

iTrader: (1)

I would think some Crane 1.46 duals would work just fine. Most solid roller guys with higher lift than yours are running those springs w/out issue.

98blackSS

Where'd you pull that info out of?

kumar75150

I am using ISKY 295D springs on a .634 .625 lift cam.

10k miles so far.

x phantom x

iTrader: (14)

How do you tell when a dual spring needs to be changed???
.

Cstraub

iTrader: (1)

For those of you running pretty hot set-ups I would recommend getting an on the head spring tester. Note the pressure of the spring new and periodically check the pressure. When you have a 15% or more drop in seat pressure time to change. The tester runs around $100.

Chris

94form2000z

iTrader: (10)

Also alot of the time you'll start to see valve float with worn springs. Sudden or even more than normal drop on a dyno sheet after higher RPM's.

cmotorsports

Be VERY careful when going to springs larger than 1.43 OD, they require the spring pocket to be cut very close to the exhaust port. If the head has ever been hot, the risk of a failure is greatly increased. I would definitely Rockwell test the heads before machining for any of the big duals. The Patriot and Comps are the best out for such a big lift cam now that we've found.

GTBMad

Thats one reason I used the 921's