425 or 455 build
#1
425 or 455 build
I have a 1965 425 with A stamped heads in a 1980 olds cutlass with 3:73 gears. And i have a 455 out of a 68 toro. with big valve c heads. I have already had the heads rebuilt. Im trying to figure out if i should put the c heads on the 425 or just build the 455 wanting a good street engine. And is it true all 425 had a steel crank?
#6
#8
In general, the 425 will be better for high rpm, the 455 will give you better torque. The C heads will flow better than the A heads, particularly if they are ported properly, but you may run into pushrod geometry problems. However, the pushrod holes can be enlarged to compensate.
The 425 does have the steel crank, so that's a plus. But if you use the 425 crank, you will end up with 425 cid.
So, it really comes down to what you want :-)
The 425 does have the steel crank, so that's a plus. But if you use the 425 crank, you will end up with 425 cid.
So, it really comes down to what you want :-)
Thread
Thread Starter
Forum
Replies
Last Post
wildwillie1981
Racing and High Performance
5
April 24th, 2013 04:19 PM