Hi All,
I'm going to use this cam with my 460 BBC:
https://www.compcams.com/drag-race-262- ... 6-454.html
If you look in the recommended section, you will see Comp has two different sets of springs they
recommend for this cam.
Here:
https://www.compcams.com/dual-valve-spr ... ner-1.html
And here:
https://www.compcams.com/dual-valve-spr ... ner-1.html
I'm using a set of updated 781 heads, with the larger 2.19/1.88 valves, bowl hogged, and valve
unshrouding.
Which set of springs should I use with my setup? Any input and/or advice would be greatly appreciated.
Thanks,
Patrick
Need advice on valve springs for my BBC cam...
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Re: Need advice on valve springs for my BBC cam...
My lifts are very close to yours. Comp solid nitrided cam. Jones EDM lifters. I went with PAC1220X beehives along with the PAC retainer and spring locator made just for this application. The retainers are small and light. The seat and open pressures with the beehives ended up being what I wanted and my Son has smallblock with a solid cam running beehives that's working really well. The 924's' just wouldn't give me what it needed for pressures both open and closed. Hope to be firing it up soon.https://www.racingsprings.com/index.php ... 11365.html
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Re: Need advice on valve springs for my BBC cam...
Is your short block already assembled?
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
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Re: Need advice on valve springs for my BBC cam...
Excellent, thanks for the info.Bob Hollinshead wrote: ↑Fri Sep 10, 2021 10:15 pm My lifts are very close to yours. Comp solid nitrided cam. Jones EDM lifters. I went with PAC1220X beehives along with the PAC retainer and spring locator made just for this application. The retainers are small and light. The seat and open pressures with the beehives ended up being what I wanted and my Son has smallblock with a solid cam running beehives that's working really well. The 924's' just wouldn't give me what it needed for pressures both open and closed. Hope to be firing it up soon.https://www.racingsprings.com/index.php ... 11365.html
Patrick
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Re: Need advice on valve springs for my BBC cam...
If you want the full air flow benefit of stepping up to the bigger 2.19” valve and can afford a 2.5 CC increase in your total CC size then laying back the intake valve notch in the piston on its deep side is the thing to do !
This is something that should be done even with the stock valve size, no less the 2.19” size and up!
This is something that should be done even with the stock valve size, no less the 2.19” size and up!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Need advice on valve springs for my BBC cam...
A lot of what you need will come down to how high you plan to turn the motor.
That being said, the 924 wouldn’t even be on my radar for that cam.
I don’t know if the 930’s would be rock solid to 7k in that application....... but 65-6700 intermittently should be fine.
Maybe upgrade to tool steel retainers.
That being said, the 924 wouldn’t even be on my radar for that cam.
I don’t know if the 930’s would be rock solid to 7k in that application....... but 65-6700 intermittently should be fine.
Maybe upgrade to tool steel retainers.
Somewhat handy with a die grinder.
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Re: Need advice on valve springs for my BBC cam...
What’s your installed height? Can’t pick a spring without that.
Re: Need advice on valve springs for my BBC cam...
Do yourself a huge favor and have the lifter bores corrected while at the machine shop. I would bet money that at least a few are not located properly.
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