Posted By: DUFFMAN
Small Blck 587 heads - 05/09/09 07:13 PM
I have a pair of 587 heads that I've been using on my 318. Of coarse this has caused low compression so I have them off and I'm going to have them milled.
So how far can I safely have them milled?
Posted By: Anonymous
Re: Small Blck 587 heads - 05/09/09 07:22 PM
use modeling clay to see how much space you will have between the piston and the top of the combustion chamber. make sure you have a gasket on when you put the clay in. i forgot how much you should have here but im sure someone else will post with a suggestion. but for every .01 you mill i believe you have to mill .005 of each side of the intake. have you thought about going with the 302 heads?
Posted By: DUFFMAN
Re: Small Blck 587 heads - 05/09/09 08:16 PM
My pistons are 0.054" below the deck and have valve notches in them so I'm not really worried about valve clearence.
In order for me to achieve my goal of 9.5:1 static compression I need to mill 0.065" off my 587 heads and I need to know if the heads themselves will have a problem with this.
I would love to do 302 heads, but these 587s only have about 1000 miles on them. Milling them will only cost about $150 compared to $500-600 to build a set of 302 heads. SO I'd like to go the more inexpensive route.
BTW, I'm also planning on using 0.028" gaskets along with the milling.
Posted By: Anonymous
Re: Small Blck 587 heads - 05/09/09 08:22 PM
not really sure on if they would hold up. try checking with a few machine shops and see what they say. the most ive actually seen anyone do was .03 so its hard to speculate with that much of a milling.
Posted By: 70rrclone
Re: Small Blck 587 heads - 05/09/09 09:08 PM
i have a pair that are milled. i'm not sure how much, it was done before i got them. i have 2.08 intake valves in them and i had to notch my plastic plate to cc them and find 60CC chambers
.
shane
Posted By: ohiodemon
Re: Small Blck 587 heads - 05/09/09 10:08 PM
i got a set of the same heads.
i milled them .060.
you'll be fine.
don't forget to have the intake side cut also.
i forget the amount, but it will help with intake manifold fitting.
Posted By: MoparforLife
Re: Small Blck 587 heads - 05/09/09 11:59 PM
If he is using the 318 port size intake the port mismatch will be negligable because they will not match the 587 heads anyway.