Just like the title says. I am rebuilding the bottom end and was wondering what compression ratio i should shot for. I am building a 355 and want to shoot it with a small shot of nitrous around 75-100 hp. Any help would be appreciated.

Brandon

 

it all depends on your dynamic compression ratio

 

I am not that familar with this but i am ready to learn if you are ready to teach.

Brandon

 

You'll get much better detailed information if you do a search for DCR in the Advanced tech forum.

But basically Static Compression Ratio is determined by bore, stroke, combustion chamber size, deck height, and head gasket thickness...

Dynamic Compression Ratio has a lot do do with valve timing events. When the intake valve closes is very important as well as the amount of overlap...

 

I ran ~13.0 on 91 Oklahoma horse **** for about a year. That was on an 847 with under 9.0 DCR. Took a little tuning but never really had a problem.

Granted it was @ 3 mistakes that got me to that point, if I was picking a number I would go a little lower because in a street motor the extra compression isn't really much power.

 

Get to know DCR.