Stock 862's on a stock ls1 shortblock would yeild what compression ratio? My buddie b
ought a tsp short block for his car and is giving me his 30k mile motor fo free

 

i have heard that they go to 11.1 but i kno u need to put the ls1 valves in the heads and maybe port em for extra flow

 

I was planning to have them massaged a lil bit. I just didn't know if I was going to mill them or not. Thanks for the info

 

if your gonna run 862s ur gonna wanna get them ported and at least run 2.00" valves on the intake side... the exhaust 1.55" is the same...
or you could just do 2.02" & 1.57" stainless vales and have a great flowing heads for a bigger cam...

 

The cam that's in the motor now is a 238/242... my current cam will most likley be reused.

I'm getting the complete motor intake to oil pan minus the accesories

 

in that case, just get the 241s milled and ported... that would be good enough for a 224

 

Have you installed the motor yet?

 

Send them to us if you want them ported. We can CNC port them and upgrade them to 2.02/1.57 valves. With a 62cc chamber you will be right at 10.7:1 static compression. Let me know if you have any other questions!

Jon