390 vs 408
dodgetkboy78 had some pretty good advice.
What, you mean like ...
LOL!!!
Anyhow, back on topic........
i would
suggest using the "302" cylinder head. clean the bowls, port match it, and put in some 2.02"/1.60 valves. you'll love it.
So 360Z28, do you reckon those 302s will flow enough to feed a swept area of 390 cui? Sorry to sound like I doubt you, but I do!! LOL!
Reason? - Ive been told by experienced people on this board that 200 cfm which is about what you'd get at .500 from a set of 302s will never feed that size engine well enough and I'd be leaving plenty of HP on the table.
If you disagree, I'd like to hear why? ...it might get some discussion happening.
NorhernSwede- FWIW I'm getting a 390 built currently - its specs are:
KB 847 flat tops
Eagle crank and rods,
Comp 282S cam 245/250 @.50
360 cast heads that flow 243 @.550 (2.02 valves)
Compression will be about 10.2:1
FWIW - I pumped the head flow and cam figs into Dyno 2000 and it came up with 425 Crank HP at 5500 rpm
Camquest came up with 445 which is probably a bit high.
Reality is, the only thing "318" about most 390s is the block!
I'll be sure an let the whole board know how it runs ;)
