C6Z gains 166/125rw 627/536rw
03-02-2016, 05:58 PM
#43
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Very impressive results Pray! Seems to me getting all that flow out of only a 275cc port might be a new benchmark for oem rect. heads.
What kind of specs are you getting our of LS3 for small CI applications my G8?
Jason
What kind of specs are you getting our of LS3 for small CI applications my G8?
Jason
03-02-2016, 06:24 PM
#44
Thanks, I just finished up another set of LS7's that outflowed the set on this car by 5-10cfm at different lifts and carried with gains to .700" on my bench. The last set went 382@.650" on my bench and 400@.650 at 28". The set I just finished went 382@.600 and 390@.700 on my bench. I would guess 410or more at 28".
I just roughed in an intake and exhaust on a set of LS3's I am doing for a 416 I am putting together in a couple weeks. All of my exhausts flow the same. LS2/3/7. The intakes went 349@.600 and 357@.700 which should correlate to 360@.600 and 380@.700 at 28" from past data. The low lift flow is what is actually more impressive. I will have to go measure the intake runner.
I just roughed in an intake and exhaust on a set of LS3's I am doing for a 416 I am putting together in a couple weeks. All of my exhausts flow the same. LS2/3/7. The intakes went 349@.600 and 357@.700 which should correlate to 360@.600 and 380@.700 at 28" from past data. The low lift flow is what is actually more impressive. I will have to go measure the intake runner.
03-02-2016, 07:05 PM
#45
The LS3 intake port came in at 269cc. I am going to do some experimenting with the short turn and a couple other spots where I could have left some material or removed some material. I am also going to mess with the valve job a hair. I am going to leave the way the valves are cut alone so that won't change the measurements. I didn't make any changes to the cross section and the intake port opening remains unchanged. I have noticed in the past that some guys are raising the port roof opening for a straighter shot at the port roof on the bench but I don't think it will be worth much with an intake on it. I will experiment with it and the intake port opening to see what I get. I would say the finished ports will come in around the 268 to 270cc size when I am done. I guess I should cc'd a stock port to see where it started the way I cc.