Building a boost motor. Using the stock LS1 block, MLS Stock Head gaskets, Stock 241 heads. What cc Piston should I be looking at to get as close to 9.1:1 as possible.

Also, how are you guys figuring it? I was looking around on how to calculate it but didn't find much.

Thanks

 

b, s, gasket, cc's are needed and then just play around with the dish number.

http://www.race-cars.net/calculators...alculator.html

The above link should help

 

Diamond Racing 9.5 to 1 Forged Pistions. I am running them and 770 hp and others I know are running them in car around 900 hp. $649 from Diamond.

 

Alright bro, I was bored so I gave you 60 seconds of my time
Assuming this is a 346 or 348 just fudge the numbers a couple thousandths
346 ex
Bore 3.898
Stroke 3.622
pistons -12 cc
cylinders 8
CC's - Not sure, so I plugged in 64
Gasket .056
Comes out to 9.15 to 1 compression

Someone correct me if I am wrong. The above also assumes that the pistons are coming out of the hole ZERO.

 

Click Me

 

With a .056" thick gasket, it should be set up with the pistons at least .010-.015" out of the hole so it can get a more ideal .040" quench. However, with boost it really doesn't matter as much.

 

How about just using a thinner gasket to increase quench vs having the piston come out of the hole at all ??

 

It'll just cost more to get a thinner aftermarket gasket.

 

Got ya !! Thanks


I didn't know if there was any disadvantage to having your pistons come out of the hole at all.

 

Thanks guys!

 

I'd go with Wiseco's new X piston set, Drew! They are a 2618 forging like many of their competitors, but have a radiused valve pocket to cut down on detonation, big thick top ring land, come with a steel top/napier 2nd ring set standard, coated skirts standard, and more!

We've got them on special currently!

That set will net you about 9.1:1 with a GM MLS and the stock 66ish cc chambers!