1999 SS

iTrader: (3)

can anyone tell me stock for stock what are the flow #'s for 241 casting ls1 head and 243 ls6 head, and if the compression would be the same if both were mounted on the same motor?

WILWAXU

iTrader: (6)

Lets try this over here

1999 SS

iTrader: (3)

does anyone have an idea?

ChucksZ06

iTrader: (9)

10 to 1 vs 10.5 to 1. ls6 flow maybe 10 % more than ls1.

1999 SS

iTrader: (3)

do you think their would be piston to valve clearance problems with the ls6 heads milled to 11.1 with vincci 1.8 roller rockers and a stock cam in a 00 ls1.

1999 SS

iTrader: (3)

do you think their would be piston to valve clearance problems with the ls6 heads milled to 11.1 with vincci 1.8 roller rockers and a stock cam in a 00 ls1?

Gunnar@Patriot

iTrader: (20)

Here is a thread that we posted on the other with stock 243 numbers from our bench:
https://ls1tech.com/forums/generation-iii-internal-engine/434815-what-do-cast-ls6-heads-flow.html

And here is a thread with the stock 241 numbers from our bench:
https://ls1tech.com/forums/generation-iii-internal-engine/434099-what-does-stock-ls1-head-flow.html

The 241 castings are 10-1 on a stock LS1 bottom end and the 243 heads aould be 10.5-1. The 241 heads have a 67cc combustion chamber and the 243's have a 64cc which will result in a .5 point gain in compression.