A460 Head - New CNC Program - Build for 565
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A460 Head - New CNC Program - Build for 565
(This might get edited a few times)
Over the past 6 years or so, my good friend,Geoff Mummert, and I have discussed replacing my set of 35 year old A460 heads that have been on the 1,000 hp 565. This past year, 2023 we finally got the project started with a set of bare 340cc TFS heads ordered from Summit.
The As-Cast 340cc port ended up at 375cc - The port flows 480-ish cfm at .900" through a 2.385" valve. Port speed is approx 310 fps.
As cast Chamber: 83cc
Finished chamber: decked to 76cc
Finished Intake port:
Ex:
Preliminary upper flow numbers: ( final flow depending on valve job)
The exhaust flow 340 @ .750 and 366 @ .900" with a 1.88" valve.
Some of what it took to get there:
molding the old A460 port vs the new TFS Port:
Ex port:
Some Programming work:
manifold fitting after we shifted the heads .035" - .035 dowel shift
The engine is going back together at 12.75:1 (target compression) it will be no lower than 12.5:1. It should be a bit stronger than the rebuild from 2021 that made 1,002 at 7,600 and 771 lbs ft at 6,000. (those heads flowed about 450 cfm with a 2.4" valve. The air speed was approx 270 fps) This should be a bit stronger. Hopefully we'll be on the dyno April
project engine: Boat engine - Target peak power 7,200-7400
CNC progress video:
https://vimeo.com/849964653
.035" dowel shift:
https://vimeo.com/889354210
CNC process completed:
https://vimeo.com/889354848
Over the past 6 years or so, my good friend,Geoff Mummert, and I have discussed replacing my set of 35 year old A460 heads that have been on the 1,000 hp 565. This past year, 2023 we finally got the project started with a set of bare 340cc TFS heads ordered from Summit.
The As-Cast 340cc port ended up at 375cc - The port flows 480-ish cfm at .900" through a 2.385" valve. Port speed is approx 310 fps.
As cast Chamber: 83cc
Finished chamber: decked to 76cc
Finished Intake port:
Ex:
Preliminary upper flow numbers: ( final flow depending on valve job)
The exhaust flow 340 @ .750 and 366 @ .900" with a 1.88" valve.
Some of what it took to get there:
molding the old A460 port vs the new TFS Port:
Ex port:
Some Programming work:
manifold fitting after we shifted the heads .035" - .035 dowel shift
The engine is going back together at 12.75:1 (target compression) it will be no lower than 12.5:1. It should be a bit stronger than the rebuild from 2021 that made 1,002 at 7,600 and 771 lbs ft at 6,000. (those heads flowed about 450 cfm with a 2.4" valve. The air speed was approx 270 fps) This should be a bit stronger. Hopefully we'll be on the dyno April
project engine: Boat engine - Target peak power 7,200-7400
CNC progress video:
https://vimeo.com/849964653
.035" dowel shift:
https://vimeo.com/889354210
CNC process completed:
https://vimeo.com/889354848
G-Code- Posts : 189
Join date : 2010-07-12
dfree383, jasonf and Mark Miller like this post
Re: A460 Head - New CNC Program - Build for 565
Is this the same Mummert that did a crazy set of iron 302 heads a few years ago?
dfree383- BBF CONTRIBUTOR
- Posts : 14800
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: A460 Head - New CNC Program - Build for 565
Are You Sticking with the Same Camshaft?
Those Heads look Great by the Way. Hope you pickup a little HP.
Those Heads look Great by the Way. Hope you pickup a little HP.
supervel45- Posts : 4460
Join date : 2013-09-04
Re: A460 Head - New CNC Program - Build for 565
dfree383 wrote:Is this the same Mummert that did a crazy set of iron 302 heads a few years ago?
Same Mummert. Those 289 EMC heads he gives credit to someone else for their program. I'm pulling a blank
G-Code- Posts : 189
Join date : 2010-07-12
Re: A460 Head - New CNC Program - Build for 565
supervel45 wrote:Are You Sticking with the Same Camshaft?
Those Heads look Great by the Way. Hope you pickup a little HP.
the cam is getting a bit of a bump, but we are considering doing an A/B test two days on the dyno. I think it would be beneficial to do so.
G-Code- Posts : 189
Join date : 2010-07-12
Re: A460 Head - New CNC Program - Build for 565
^ Double LIKE Button
supervel45- Posts : 4460
Join date : 2013-09-04
Re: A460 Head - New CNC Program - Build for 565
G-Code wrote:dfree383 wrote:Is this the same Mummert that did a crazy set of iron 302 heads a few years ago?
Same Mummert. Those 289 EMC heads he gives credit to someone else for their program. I'm pulling a blank
If you see him ask him how much they are getting to run a set of heads that that program.
dfree383- BBF CONTRIBUTOR
- Posts : 14800
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: A460 Head - New CNC Program - Build for 565
Damn those Intake and Exhaust ports look so nice it's to bad you have to bolt and Intake and Exhaust on to them!!But i guess if you don't you can't get any Horsepower Numbers from those great Flow Numbers!!
Mark Miller- Posts : 1895
Join date : 2009-09-01
G-Code likes this post
Re: A460 Head - New CNC Program - Build for 565
dfree383 wrote:G-Code wrote:dfree383 wrote:Is this the same Mummert that did a crazy set of iron 302 heads a few years ago?
Same Mummert. Those 289 EMC heads he gives credit to someone else for their program. I'm pulling a blank
If you see him ask him how much they are getting to run a set of heads that that program.
I'll see him this coming week and I'll ask him.
G-Code- Posts : 189
Join date : 2010-07-12
dfree383 likes this post
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