Power Gain Swapping 6.1 Heads For Apaches

[Blue Blur 45]

Wondering what my gains would be swapping from cnc'd 2.10x1.60 6.1 heads to cnc'd Apache's on my NA 420" engine with .600 lift cam. 50hp? 20hp? Anyone dyno this change before? Right now it has run 122mph with 2.0 60ft at 2300ft elev, 3670lb race weight on pump 91. Would love to see 130 mph in the 1/4 if head swap would get me there. Also do the older Manley pistons have big enough valve pockets for the 2.14's in Apaches?

[toofart 148]

Did your wife really need to do math to figure out that 17 + 17 is 34?

[Goehner 240]

^^

[Adanac Charger 30]

I'd guess .2 and 2mph in the 1/4. Do a search on InferAl and Apache heads.

I don't see any way that heads will net you 8mph.

[Blue Blur 45]

Did your wife really need to do math to figure out that 17 + 17 is 34?

Yeah, thats my girl ..

I'd guess .2 and 2mph in the 1/4. Do a search on InferAl and Apache heads.

I don't see any way that heads will net you 8mph.

I don't see them giving me 8 mph either. I think these heads have 124-125 in them as it is. I read somewhere you get 2hp per cfm of flow improvement, 20cfm= 40 fwhp. Who knows, might not be worth the trouble on my car. I don't need to set any records.

[CJT 2]

40 is a good ballpark for ported to ported.