Valve spring advise

[forcefed3.8's]

I am putting together a 274" on center engine with ported GN1's. I will be running a 224 billet hydraulic roller from Weber but running it with solid roller lifters for the offset. I plan on running the engine to 6500 to 6700. What open/seat pressures should I look for? Lift is .574 with 1.6 rockers.

 

[Nick Micale]

I am putting together a 274" on center engine with ported GN1's. I will be running a 224 billet hydraulic roller from Weber but running it with solid roller lifters for the offset. I plan on running the engine to 6500 to 6700. What open/seat pressures should I look for? Lift is .574 with 1.6 rockers.

I run my car in that range, and now using 190# on the seat.

If you need more info, just give me a call. :smile:

 

[Cme2fly]

I am putting together a 274" on center engine with ported GN1's. I will be running a 224 billet hydraulic roller from Weber but running it with solid roller lifters for the offset. I plan on running the engine to 6500 to 6700. What open/seat pressures should I look for? Lift is .574 with 1.6 rockers.

I'm running a PAC beehive BBC spring. I run around 225 at the seat @ around 1.800 install height. Some of the heavy hitters run around 300 plus at the seat.

 

[forcefed3.8's]

How about some open pressures at max lift?

 

[mygn276]

I believe my open pressure was around 650lbs at 600 lift. 230 224 cam.

 

[Cme2fly]

How about some open pressures at max lift?

Around 600lbs @ .625 max lift.

 

[GARY HARVEY]

I'm with Nick... BIG TIME.
More spring than is needed is a BIG no no.

You be using titanium too?

 

[Cme2fly]

I'm with Nick... BIG TIME.
More spring than is needed is a BIG no no.

You be using titanium too?

Please elaborate...

 

[GARY HARVEY]

The titanium part or the physics of to much seat pressure?

 

[forcefed3.8's]

Bring this back up. I am ready to order springs. I will have titanium retainers. The heads are GN1's with 1.9/1.6 valves.

 

[Cme2fly]

Bring this back up. I am ready to order springs. I will have titanium retainers. The heads are GN1's with 1.9/1.6 valves.

Check out PAC racing springs. I've had good luck with all of there products. What pressure did you decide on? I recently installed some beehives on a set of M&A's that installed 1.800@245 with a max lift of .600.

These will get the job done.
http://www.racingsprings.com/Store/ProductView.asp?ProductID=194

 

[forcefed3.8's]

I am looking in the 600 range open. I found some Comps that fit the bill, but am afraid of Comp's quality lately.