Trying to decide how big is too big for the new powerplant. How big have you heard of people going in a 1965 Gt coupe without going crazy on customizing. Ideally i want a 427. Have you ever heardd of that fitting?  

If you're talking about an FE big-block, yes, it's been done before. But it'll require major modifications, like cutting or removing the shock towers. You might want to consider a small-block stroked to 427 cubic-inches - you'll still get the displacement but it'll be a direct bolt-in.

Donald Farr
editor  

what would be the biggest motor to fit in my 67' coupe? I was also looking at a rather large motor and would of course prefer little to no modification. I love the 428 cobra jet, but im sure its too large. let me know what the biggest you guys think i could fit. thanks for your help!  

Yes any big block ford except for a boss nine or sohc will fit in the 67 428's even came with a gt500 shelby. A 427 bb will also fit.  

Correct. To clarify my previous post, a big-block will not fit into a '65-'66 Mustang without major modifications to the engine compartment. However, because big-blocks became available in '67 Mustangs, their engine compartments, and those of '68-'73 Mustangs, will accept a big-block, with the exception of the Boss 429, SOHC 427, etc.

Donald Farr
editor