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461 heads - Angle mill vs Flat mill

 
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jtb0322
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PostPosted: Mon Feb 16, 2015 6:20 pm    Post subject: 461 heads - Angle mill vs Flat mill Reply with quote

I've recently picked up a set of 461 heads and planning on taking them to the machine shop very soon.. I'm building a 355 with flat tops, and a zeroed deck. I'm looking to get around 12:1 compression with these heads and need some advice on milling.. I've cc(ed) these heads at home and come up with around 61-62 ccs.. Granted that was done on my bench and may not be 100% accurate. I would like to angle mill due to P-V clearance but I don't know which way to go quite yet.. Can I achieve 12:1 with a flat mill? If not, how much should I angle mill and what is the approx. price difference? Thanks guys!
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Feb 17, 2015 12:24 am    Post subject: Reply with quote

if i put in the numbers right, you just need a .020 head gasket and you're there. check out the auto math here.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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jtb0322
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PostPosted: Tue Feb 17, 2015 10:58 am    Post subject: Reply with quote

Thanks but I figure I would need at least a .035" head gasket for quench on a zero deck.. I also forgot to mention the pistons have a 7cc valve relief area..
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Feb 17, 2015 11:34 pm    Post subject: Reply with quote

OK!! what size cam? on a 4" bore you will be around 4cc for .005"

Check the cam now at 10 before Exhaust and 10 after intake..... That will give you a point......
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Feb 17, 2015 11:37 pm    Post subject: Reply with quote

By the way??? 12:1 will never happen with a 350 and those heads............ with a flat top and -6 cc..... unless you get to 49 or less on the heads....
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jtb0322
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PostPosted: Wed Feb 18, 2015 3:15 am    Post subject: Re: 461 heads - Angle mill vs Flat mill Reply with quote

jtb0322 wrote:
I've recently picked up a set of 461 heads and planning on taking them to the machine shop very soon.. I'm building a 355 with flat tops, and a zeroed deck. I'm looking to get around 12:1 compression with these heads and need some advice on milling.. I've cc(ed) these heads at home and come up with around 61-62 ccs.. Granted that was done on my bench and may not be 100% accurate. I would like to angle mill due to P-V clearance but I don't know which way to go quite yet.. Can I achieve 12:1 with a flat mill? If not, how much should I angle mill and what is the approx. price difference? Thanks guys!




12:1 is not set in stone but I have found some help and figured out a 0-.120 angle mill will bring the heads somewhere around 52-53 ccs.. Adding flat, not dimpled, valves will also help.. This will bring me around 11.7-11.8:1.. Its only a short block at this point and I'm not looking for dynamic compression.. Can you explain the post about the cam?
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Wed Feb 18, 2015 6:26 pm    Post subject: Re: 461 heads - Angle mill vs Flat mill Reply with quote

[quote="jtb0322"]
jtb0322 wrote:
Can you explain the post about the cam?



When you decide on a cam put in in overlap at TDC. Back up 10* and check exhaust clearance then go 10*the other side of TDC and check the intake using a dial indicator with the springs you are going to run.
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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Wed Feb 18, 2015 8:27 pm    Post subject: Reply with quote

You are getting good replies on ST. Robert1 is involved with the system and you need to listen..
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jtb0322
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PostPosted: Wed Feb 18, 2015 11:52 pm    Post subject: Reply with quote

I'm certainly listening because there are people helping me with what I am asking.. I posted here first and got no actual help with the topic.. The guys over there are shedding some light and providing valuable information
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