Stereophile33
New member
- Joined
- Nov 13, 2003
- Location
- Portland, OR
I just want to post this up so hopefully it will become internet lore.
We've been doing alot of head stuff and for turbo and NA folks using camshafts under 12.5mm of lift and for that matter stock unported intake manifolds, the 531/405 head is a waste of your time as it won't make more power, especially under the curve.
A well ported/filled 530 will make more power than a 531 anyday with a cam under 12.5mm. If going to a bigger cam, you bet, make the jump for the 531/405 heads, but you should also consider one of Nathan Kahler intake manifolds at that point.
Cheers.
Jonathan
We've been doing alot of head stuff and for turbo and NA folks using camshafts under 12.5mm of lift and for that matter stock unported intake manifolds, the 531/405 head is a waste of your time as it won't make more power, especially under the curve.
A well ported/filled 530 will make more power than a 531 anyday with a cam under 12.5mm. If going to a bigger cam, you bet, make the jump for the 531/405 heads, but you should also consider one of Nathan Kahler intake manifolds at that point.
Cheers.
Jonathan