240 head
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Joined: Jun 2003
Posts: 351
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From: Star, Idaho
What cc's does the head need to be to get your CR around 9:1? The last V8 I built, a stroked 400, had CHI 2V heads that were milled down to 62.6cc which gave me, along with the pistons, a 10.3:1 CR.
While it is on my mind, is there a good custom grin for a cam that most people know of or do you just go with a typical performance cam?
While it is on my mind, is there a good custom grin for a cam that most people know of or do you just go with a typical performance cam?
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Joined: Dec 2000
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From: South central, Minnesota
So with out knowing all the variables you can't say that a --cc combustion chamber will give you a certain compression ratio.
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Postmaster
Joined: Mar 2005
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From: Earth
Found a pretty good deal on a set of long shank carbide burrs for anyone who's interested - Amazon.com: Neiko Tools USA 4 piece Long Reach Double Cut Carbide Burr Bit Set: Home Improvement
Lead Driver
Joined: Mar 2008
Posts: 7,193
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From: Near Los Angeles
Thanks for posting the photos!
Back when I paid $350 to have my head ported, but only got the bowls cleaned up and a gasket match (about 1/2") at the entrace. I never saw the bowls since the valves were installed b/f I saw the work. So I'm real interested in breaking down the head and looking.
Anyways, it looks like you're doing a real nice job. Any tips?
Back when I paid $350 to have my head ported, but only got the bowls cleaned up and a gasket match (about 1/2") at the entrace. I never saw the bowls since the valves were installed b/f I saw the work. So I'm real interested in breaking down the head and looking.
Anyways, it looks like you're doing a real nice job. Any tips?
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Postmaster
Joined: Mar 2005
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From: Earth
Thanks. I'm almost surely doing more than it needs, but the timeline on this is open ended and there's surprisingly less material than you'd think coming off the head.
As far as tips go, find a comfortable place you can sit and work then take your time. It's taken me 6-8 hours to get the one cylinder done. The rest should go much faster now that I know how they're going to look - #1 is now the template for 2-6.
Don't start until you have the right tools. I ended up taking more off the guide boss than I really needed or wanted to because I got ants in my pants and started grinding with a stubby mandrel. I've got a cheapo electric die grinder and speed control, I keep the speed as slow as it will go. Maybe it's just me but the grinder wants to jump around at higher speeds. Especially with burrs, which gouges things really bad really fast.
Did I mention going slow?
I've got another thread going on the FSP board, there's some good info there too. Going in I figured conventional wisdom was don't do much, just clean up a bit. Operating theory over there seems to be, no worries you can't over port it without hitting water anyway. Just the validation I needed to go nuts...
FORDSIX PERFORMANCE • View topic - Some porting pics; any advice?
As far as tips go, find a comfortable place you can sit and work then take your time. It's taken me 6-8 hours to get the one cylinder done. The rest should go much faster now that I know how they're going to look - #1 is now the template for 2-6.
Don't start until you have the right tools. I ended up taking more off the guide boss than I really needed or wanted to because I got ants in my pants and started grinding with a stubby mandrel. I've got a cheapo electric die grinder and speed control, I keep the speed as slow as it will go. Maybe it's just me but the grinder wants to jump around at higher speeds. Especially with burrs, which gouges things really bad really fast.
Did I mention going slow?
I've got another thread going on the FSP board, there's some good info there too. Going in I figured conventional wisdom was don't do much, just clean up a bit. Operating theory over there seems to be, no worries you can't over port it without hitting water anyway. Just the validation I needed to go nuts...
FORDSIX PERFORMANCE • View topic - Some porting pics; any advice?
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Postmaster
Joined: Mar 2005
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From: Earth
I've got an Offy C and 500cfm Edelbrock on the Bronco now, I've also got 1.08 and 1.12 Autolite 4100s I'll try at some point.
I'm not 100% fixed on a cam yet, but I'm leaning toward the Isky 262.
I'm not 100% fixed on a cam yet, but I'm leaning toward the Isky 262.
Lead Driver
Joined: Mar 2008
Posts: 7,193
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From: Near Los Angeles
Interesting on the Isky choice. I too was interested in that cam. I've been reading a lot about different cams, and if the Isky 262 appeals to you, you might want to take a look at cams from Accelerated Motion. They have very similiar, but with a bit more duration like the comp 260, and with a 109 LSA. What I like about it is that the power curve seems lower, beginning at about 1400 rpm, or so they say, where as the Isky begins around 2k rpm. And ...it has a nice lope at idle.
Elder User - What???
Joined: Dec 2011
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From: Moore, OK
Found a pretty good deal on a set of long shank carbide burrs for anyone who's interested - Amazon.com: Neiko Tools USA 4 piece Long Reach Double Cut Carbide Burr Bit Set: Home Improvement
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Postmaster
Joined: Mar 2005
Posts: 2,949
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From: Earth
No, but my assessment would be about the same. Out of balance or bent, I can't say for sure. Luckily I run the grinder at low speed so they didn't crater anything. After cutting about 3" of the shank off they're at least usable. One star, for sure.
