alluminum vs. cast iron heads
01-11-2006 | 09:21 PM
#32
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From: charlotte nc.
Re: alluminum vs. cast iron heads
with a blown 540 the 671 is a little small it would help if you would bring the comp up some with iron heads i would go to about 8 2 with this you could slow the blower down some and it would make more power, with aluminum heads i have gone as high as 9 to 1 but 8.5 would be safe and yes with this combo 925 hp plus is very normal i like the afr i run the 357 cnc heads on my 540 at 8.6 and it makes over 1000
01-12-2006 | 07:44 AM
#34
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Re: alluminum vs. cast iron heads
Originally Posted by mikes280
with a blown 540 the 671 is a little small it would help if you would bring the comp up some with iron heads i would go to about 8 2 with this you could slow the blower down some and it would make more power, with aluminum heads i have gone as high as 9 to 1 but 8.5 would be safe and yes with this combo 925 hp plus is very normal i like the afr i run the 357 cnc heads on my 540 at 8.6 and it makes over 1000
Thanks for the post, How much boost are you running???
01-12-2006 | 07:47 AM
#35
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Re: alluminum vs. cast iron heads
Originally Posted by blastersbro
i told you not to listen to people that tell you your combo is fine this guy knows.i have gone 9.5 compression no problem and 9.2 with steel heads.afr cnc hard anodized heads pretty good dart pro 1s the best.nothing wrong with merlins steel head if that is what you got.
now that makes sense blaster, thanks
