ocls1

I have a lq9 bored and stroked to a 408.......Diamond Flat top pistons with-2 cc vavle relief pistons callies rods and callies 4"crank. My budget is really tight so right now these are my options.

317 casting milled with valve job
243 with valve job
241 with valve job and some porting

I was wondering which one of these is best for my setup?
I know i can there is a better option of heads but for right now this is all my budget is letting me do.... any imput will be appreciate it!

408 is stock deck height

htownws6

iTrader: (1)

probably the 243's

txh0tb0i972

iTrader: (63)

IMO id say mill down a 317 have a valve job and then some slight port work done to them.
With the larger CC I personally think they will flow alot better and you can run a thiner head gasket to make up some of the compression

ocls1

so 243s or 317 castings? Not sure if ill have enough to do the port work to the 317 castings but ill find out. I might be able to get some l92 at a good price if i decide to go that route

Sales4@Texas-Speed

iTrader: (4)

I think you almost have to run the 317s to keep your compression beneath 11.5:1. The 243s with a 64cc chamber will have you at 11.8:1 with that -2cc piston. You will have to run the 317s so you can stay on pump gas, you can mill them some to get added compression though. A 68cc chamber would put you in a pretty good spot with the setup you have.

ocls1

So your sayings get a 317 casting and mill it to 68cc? that would roughly put me at 11.5?
Just dont want to put it all together and have like 9.5 lol

Sales4@Texas-Speed

iTrader: (4)

You would be at 11.3:1 with that setup. That would be a lot safer then being at 11.8:1 with the 243 heads.

ocls1

I want to keep it on 93 octane due to the fact it is a daily driver

So what thickness gasket would I run?

Sales4@Texas-Speed

iTrader: (4)

I calculated the 11.3:1 with the stock thickness gasket in there.