An old racer rule of thumb is 2* for every 75hp, so 4-5* is a good starting point. Colder plugs of at least 1 heat range would also be a good place to start.... I'd probably go 2 heat ranges and keep an eye on them.

I'll have to crunch the CR but I think you're a bit on the high side. Are you at a zero deck height (piston top flush with deck of block)?

To cc, you need to get the deck surface level. Then get a burrette and a spark plug. Use a little bit of dishwashing soap to break the surface tension and fill the chamber up. If you can get a piece of plex and drill a hole in it, that'd be the best way. Then just use a bit of vaseline to seal the plex to the head.... then fill.

-Mindgame

 

i used a program to calculate the CR. the machinist told me i would be around .005 deck? that sound right?

i add the dish soap to the oil? or are you implying to fill the cc with water?


And what does quench mean? ive heard it talked about a lot, dont know what is good or bad when dealing with it though!

 

That's right at what I get for near zero deck (of course I can only assume the gasket bore diameter). But ~10.7 is probably real close.

Nah, just use water to cc.

"Quench" is the distance from the top of the piston at TDC to the deck surface of the cylinder head.
If the piston is say, .005 down the bore at TDC and the intake gasket is .035 when compressed, then we have a .040 quench height. .035-.045 is usually what people shoot for although you can go tighter.

-Mindgame

 

gasket is 4.125 and .039

so what effect does quench have on stuff? is a big quench bad?

 

hehe, wow, 10000 posts Jordan!!!!!!! Way to go!!!! hehe Sorry for off topic post...hehe just noticed it was exactly 10000.