1.7 Rr ?
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Originally Posted by devilfish
will this spring work with the hotcam and 1:7 rrs?
1.470" o.d. single with damper...
1.470" o.d. single with damper...
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Originally Posted by silver & red CE
Not sure if you knew this already, that diameter spring requires machining the spring pockets on stock GM SBC heads.
Melting Slicks
Joined: Sep 2003
Posts: 3,031
Likes: 74
From: If you don't weigh in you don't wrestle Road America
So do we have any recommendations for a spring for the Hot Cam and 1.7 rr, with the LT-4 heads? I'm just curious because I have been looking at swapping out the 1.6's on my LT-4. What would that all intail, studs, rods, springs and rockers right? 
Last edited by 96CollectorSport; Nov 23, 2004 at 09:49 AM.
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
[QUOTE=96CollectorSport]So do we have any recommendations for a spring for the Hot Cam and 1.7 rr, with the LT-4 heads? [QUOTE]
I think you could use my spring for that, it is a comp cam 941 spring, installed at 120lb (1.78"), w/ coil bind height at 1.23" I believe. The open pressure is high though, around 360 lb or so at your peak lift.
Unfortunately, I have a cam w/ a little more lift than the hot cam, and the 1.7's would put me at .600" lift, and I would just have the .050 clearance before coil bind. Too borderline for me, I have to replace.
I think you could use my spring for that, it is a comp cam 941 spring, installed at 120lb (1.78"), w/ coil bind height at 1.23" I believe. The open pressure is high though, around 360 lb or so at your peak lift.
Unfortunately, I have a cam w/ a little more lift than the hot cam, and the 1.7's would put me at .600" lift, and I would just have the .050 clearance before coil bind. Too borderline for me, I have to replace.
Le Mans Master
Joined: Jan 2002
Posts: 5,556
Likes: 0
From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Ok so if my numbers are right this is what I will have.
Stock LT1 cam = .447/.459 @.5 and going up to 1.7 rr I will have .506/.520
And from what I have found is that the norm seat height of the springs will be 1.700 and that would give me a max open height of 1.18.
So now I need to find some springs that are 100-120lbs at 1.700 and
around 300lbs at 1.18 compressed. Am I right so far?
Oh and two more things, what dia. spring can I go with and NOT have to cut the heads? Also should I go with a double spring setup or stick with the single spring?
Stock LT1 cam = .447/.459 @.5 and going up to 1.7 rr I will have .506/.520
And from what I have found is that the norm seat height of the springs will be 1.700 and that would give me a max open height of 1.18.
So now I need to find some springs that are 100-120lbs at 1.700 and
around 300lbs at 1.18 compressed. Am I right so far?
Oh and two more things, what dia. spring can I go with and NOT have to cut the heads? Also should I go with a double spring setup or stick with the single spring?
Last edited by fsr402; Nov 23, 2004 at 12:01 PM.
