I am in the process of building a 427 stroker and have a question about heads. I have listed the specs that I have acquired thus far with regards to the build below:

427 Darton Sleeved LS1
12.5 comp
4:00 crank
256/264 - 625/625 - 113+4 hydraulic cam
FAST 90
Holley 90 TB
4:125 Dome Pistons
6:125 rods

I want to go with a set of CNC Ported Dart Heads:
250cc intake port - 68cc chambers - 2.08/1.60 intake/exhaust.

My question are:
Is this head to big for this build
What size spring for this cam?
Should the spring be a beehive or dual spring?

Thanks guys!

Chad

 

I may be wrong but im pretty sure those heads will be fine with the 427. i would also go with a dual spring.

 

I'd say those heads are too big for the intake. Put a SuperVic on it, or at least a Vic Jr. so the thing can get some velocity for the heads to use.

 

I ran a set of those heads on my 402 with a 90/90 and a cam just a bit smaller then that, and it worked out great. May even want to conisder and ls3 or ls7 top end. Definately go with dual springs.