Re: Aluminum heads
The 781 is great, but it's also 119cc chamber. On a 402, your compression will be around 8:1. Unless the pistons have been changed.
For an alum head, Edelbrock makes a 290c Roval with a 100cc chamber. It is for marine applications. Flows well and will raise your compression.
Single turbo alum 5.3 LS
9.45 @ 145.35 so far.....
2000 C5 Corvette Auto 10.99 @ 123.8 NA
I'll be back for you Jack, and I'll let the machine speak!