11.56:1 compression with 346.68 cubic inches.

sound safe on 93 octane?

Formula is below, i hope its correct. Thanks

Bore : 3.903
Stroke : 3.622
Head cc's : 70
Gasket thickness :0.047 ( stock, not sure if this is right )
deck height :0.0001
Pistons : +12 cc Domes
Cylinders : 8

 

Thats gonna be border line with 93 octane. Especially in the summer. Your tune and cam will have alot to do with how well it ultimatley works out though.Just my $.02 Good luck.

 

Heres more data.

LS6 block, Lunati crank, billet rods and forged pistons. All strong stuff. 6.0 ported heads, electric water pump, 160 stat

Cam shaft will be in the 235/240 range around 112 lsa with over .600 lift on both sides.

thanks for any replies.

28 degrees timing too much?

 

Sounds like a good combo, 28 degrees of timing might be too much.

My old 422ci was somewhere around 11.75:1 and I ran 25 degrees of timing, it only gained like 3rwhp going from 25 degrees to 28, 30, and then 31, and it was not worth it.

 

Thanks Pro Stock John, crazy deal on these pistons. Had to go with the 6.0 heads but wanted to make sure that doing so was still going to be safe enough over a 5.3, LS1 or LS6 casting. Didnt want to have to find new pistons

Would running a colder plug be benificial? What plug do you recommend? Will be doing a mail order tune, so i will request 25 degrees of timing.

 

Scoobie, have you changed plans?? Are these for you?