building a 408 what compression will this setup be
04-13-2007, 12:03 PM
#1
building a 408 what compression will this setup be I am in the process of building my 408. I ordered my rotating kit from ls1 speed
compstar forged 4"crank
compstar forged 6.125" rods
Diamond forged 4.030" bore -2cc dished pistons
clevite coated main and rod bearings
this is all going into my 6.0l iron block which will be bored 4.030
I will use the l92 heads and l76 intake
using the stock 68.9cc combustion chamber what will my compression be with a .052" compressed head gasket? i originally wanted to run a 10.5:1 compression with -10cc pistons , but ls1 speed advised me to go higher with the -2cc pistons saying ill be fine with 93 pump gas. will this work out?
whats the highest compression i can use on a good tune with 93?
compstar forged 4"crank
compstar forged 6.125" rods
Diamond forged 4.030" bore -2cc dished pistons
clevite coated main and rod bearings
this is all going into my 6.0l iron block which will be bored 4.030
I will use the l92 heads and l76 intake
using the stock 68.9cc combustion chamber what will my compression be with a .052" compressed head gasket? i originally wanted to run a 10.5:1 compression with -10cc pistons , but ls1 speed advised me to go higher with the -2cc pistons saying ill be fine with 93 pump gas. will this work out?
whats the highest compression i can use on a good tune with 93?
04-13-2007, 07:12 PM
#4
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10.7 SCR for me! The guy doing the L92 heads for me recommended 10.7 SCR for my 402.
His reasoning was that if I went to 11.5 I couldn't run as much timing. This guy builds some nasty motors.
I'll see in a week or two.
Bob K.
His reasoning was that if I went to 11.5 I couldn't run as much timing. This guy builds some nasty motors.
I'll see in a week or two.
Bob K.
04-15-2007, 11:29 PM
#5
Bob, what camshaft are you going with? It seems that no one really knows what cams seem to work good with these heads due to the offset valve. I wonder if GM's 239/251 .570"/.570" 106.5 lsa would work. My car doesn't need to be show room streetable, as long as it idles and pulls like hell up top (Even if I have to make peak HP over 6500). How high are you planning on reving?
