Re: BROKEN INTAKE VALVE SPRINGS?
[Re: second 70]
#2242539
01/27/17 11:31 PM
01/27/17 11:31 PM
|
Joined: Mar 2010
Posts: 984 Tennessee
Hemi ragtop
super stock
|
super stock
Joined: Mar 2010
Posts: 984
Tennessee
|
Ok, don't want to highjack this post, but you guys have me worried! I have 5,477 miles on my strickly street HEMI. I run a Comp Cams street HEMI solid roller. Comp #24-000-9. 248/254 @ .050, gross lift .604/.591. The MSD has a chip of 6,400 rpm and I have never revved it past 6,200. Springs are Comp #953-16. I have tried to find pressures, all I have been able to come up with is #162/#484. Do I need to worry about spring replacement? This is a STREET roller, supposedly designed to live on the street. Isky Bushed lifters, oil fed, stock rockers and valves. Stock oil to the upper end. With MP aluminum heads, I adjust the valves every 1,000 miles at .010/.012 cold, .016/.018 hot. So do I need to change the springs, or are my low pressure/rpm good to go for another season of driving the car?
|
|
|
Re: BROKEN INTAKE VALVE SPRINGS?
[Re: 68HEMIRR]
#2242733
01/28/17 12:23 PM
01/28/17 12:23 PM
|
Joined: Jan 2003
Posts: 19,382 Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,382
Las Vegas
|
Might want to call Pac direct and see what they say
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: BROKEN INTAKE VALVE SPRINGS?
[Re: Hemi ragtop]
#2242765
01/28/17 01:34 PM
01/28/17 01:34 PM
|
Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
|
Ok, don't want to highjack this post, but you guys have me worried! I have 5,477 miles on my strickly street HEMI. I run a Comp Cams street HEMI solid roller. Comp #24-000-9. 248/254 @ .050, gross lift .604/.591. The MSD has a chip of 6,400 rpm and I have never revved it past 6,200. Springs are Comp #953-16. I have tried to find pressures, all I have been able to come up with is #162/#484. Do I need to worry about spring replacement? This is a STREET roller, supposedly designed to live on the street. Isky Bushed lifters, oil fed, stock rockers and valves. Stock oil to the upper end. With MP aluminum heads, I adjust the valves every 1,000 miles at .010/.012 cold, .016/.018 hot. So do I need to change the springs, or are my low pressure/rpm good to go for another season of driving the car? It seems those springs are working for you, but they definitely aren't what I would have used. In the Comp catalog, looking through listings for their street roller cams, where the 953 is listed as the spring of choice........ It's listed as the base spring..... Not the premium option. The premium option for the 953 is the 938. The specs for the 938 are 204 @ 1.900/ 492 @ 1.300. 99% of the time, this will be the minimum pressures I like to see in a BB application with a mild roller cam. My spring of preference when looking to meet those specs is the Isky 9315. 210 @ 1.900/500 @ 1.300, and .100 more distance from coil bind at 1.300 than the 938. I guess my advice for you would be the same as the other poster above...... Pop a couple out, have them tested, look all the associated parts over and make a decision based on what you find. A PAC alternative would be a 1227; 225 @ 1.900/525 @ 1.300.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: BROKEN INTAKE VALVE SPRINGS?
[Re: B G Racing]
#2244589
01/31/17 11:55 AM
01/31/17 11:55 AM
|
Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
|
The first time I freshened up my hemi, the valve stems were worn out. Luckily, new valves tightened it right up and I ran it like that for a few more years. The next freshen up it needed new valves again as well as guides. I just had bronze liners installed in the original guides, instead of driving out the old ones and putting new ones in. Worked great. This last time, I did not put valve seals on the exhaust valves. Thinking maybe that will help somewhat w/ oiling the stems. Still have em on the intake though.
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: BROKEN INTAKE VALVE SPRINGS?
[Re: 68HEMIRR]
#2244627
01/31/17 01:05 PM
01/31/17 01:05 PM
|
Joined: May 2013
Posts: 80 new york
68HEMIRR
OP
member
|
OP
member
Joined: May 2013
Posts: 80
new york
|
yep.....did the same thing....all new valves/springs/pressed in bronze valve guides/seals and lapped in the valves
BORN TO BE WILD
|
|
|
|
|