90lxrider

im looking to make a killer street car...ive been kicking around the idea of either a 331 or 351...it would be EFI.....and i would like to turbo it also

i need some advice 331 vs. 351 and dont say stroked 351 b/c it will be my DD in the summer and i dont want to spend ALL my money on gas

AdderMk2

351w has more power holding potential, A rebuild will cost about the same either way you go... so its really up to you

LTnone

A guy on the forums had a 408 getting 17mpg. That can't be too much worse than what you're doing now

r.barn

If you want boost later I would go with 351W
It will handle the extra power better than a 331 on a stock 302 block

If you have the money a 331 on a Dart block would be strongest and
best way to go.

jthorn9

Why not 347? Just currious, that's all.

ih8chevy

351 ftw
no replacement for displacement

Gus_Gt

351W and Turbo.... MPG shouldnt be an issue, if you are planning to go big cubes + Turbo... IMO...

If you want MPG, get a beater!

chath_brick

if you have the ability, then definitely a 351. MUCH more potential down the road.

my77stang

400+ cubic inch stroker with a baby cam will still make tons of low end torque and wont kill you at the pumps

67mustang302

351 definately has more power potential, and a better rod/stroke ratio than a 331, it also doesn't weight too much more, like 75lbs I think? Someone can correct me on this if I'm wrong.