Quote:

If you put the 440 avs on the 383 and put a good set of valve springs on it so it will turn the rpm needed to match the 440 air flow. Put a 3.91 gear in the 383 and a 3.23 in the 440 to match the power curves. You will be surprised how close they are.

There are exceptions to every rule, sure the over cammed 360 will run better as a 408. You have a hydraulic cam and can't turn enough rpm to meet you heads limit. In both those cases a 408 will run better than the 360.

The point I am trying to make is don't think you are going to take the heads, cam, induction, and headers off of your well matched 360 put them on a 408 and make 13-14 percent more Hp. If you do there was a problem with your 360.



I totally understand what you are saying but in every case I've seen more cubes make more power. Even in stock form. This is how the factories do it, same cams, same heads, same throttle body, more displacement, more power.

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.