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D3VE-A2A Heads for 460 rebuild

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Steveo909

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« on: January 26, 2017, 05:08:09 PM »
Rebuilding the 460 in my 1983 21' Eliminator jet boat. I plan on replacing the dished pistons with some flat tops to up the compression ratio, slightly bigger cam, yadda yadda yadda. Im looking for a machine shop to open up the exhaust ports on my cast iron D3VE's. I called a couple places in riverside and they both said they dont port heads. Does anyone have any recommendations?
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Brad @ SCJB

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« Reply #1 on: January 26, 2017, 05:12:41 PM »
Maybe Bostick?

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Six-Oh-Nine

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« Reply #2 on: January 26, 2017, 11:27:49 PM »
Not a big deal... biggest part is getting that exhaust lump mowed out... that is gonna help the most to get the exhaust ports to start moving some air.

If you like, give me a call... 619-792-3885 I have a complete machine shop, so anything along with porting you may like to have dine, we can handle.


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The Bostick

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Steveo909

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« Reply #3 on: January 27, 2017, 01:16:07 PM »
Not a big deal... biggest part is getting that exhaust lump mowed out... that is gonna help the most to get the exhaust ports to start moving some air.

If you like, give me a call... 619-792-3885 I have a complete machine shop, so anything along with porting you may like to have dine, we can handle.


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Hey Bostick thanks for the reply. Thats exactly what I'm looking for. I am still in the process of tearing it down. If you are able to take care of everything at your shop that would be great. Saves me from having to drag that stuff around everywhere. Depending on what the heads look like I will probably need the seats ground and new valve guides.
As far as the block goes, just a bore and hone hopefully only .030 over and everything cleaned up. I will give you a call when i have have everything apart.

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Six-Oh-Nine

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« Reply #4 on: January 29, 2017, 12:48:12 AM »

Hey Bostick thanks for the reply. Thats exactly what I'm looking for. I am still in the process of tearing it down. If you are able to take care of everything at your shop that would be great. Saves me from having to drag that stuff around everywhere. Depending on what the heads look like I will probably need the seats ground and new valve guides.
As far as the block goes, just a bore and hone hopefully only .030 over and everything cleaned up. I will give you a call when i have have everything apart.

Called you back Saturday as Friday ended up being a pretty late/hectic day on the dyno. What you have is a pretty basic deal and not a problem.


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The Bostick

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LakesOnly

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« Reply #5 on: February 09, 2017, 11:13:45 AM »
Rebuilding the 460 in my 1983 21' Eliminator jet boat. I plan on replacing the dished pistons with some flat tops to up the compression ratio, slightly bigger cam, yadda yadda yadda. Im looking for a machine shop to open up the exhaust ports on my cast iron D3VE's. I called a couple places in riverside and they both said they dont port heads. Does anyone have any recommendations?
There is a significant amount of power that can be gained with the right combination of cylinder head mods to the D3VE heads.  For larger power gains they do require more mods than other factory iron heads but to 500 hp or so it's pretty straightforward.  That being said, just porting the exhaust alone is not the answer to your hp needs.  And forget "flow ratio."  Improving cylinder head efficiency all the way around is what's necessary.

Not a big deal... biggest part is getting that exhaust lump mowed out... that is gonna help the most to get the exhaust ports to start moving some air.
When it comes to improving the exhaust port flow of the D3VE heads specifically, the Thermactor boss (ie, "Smog Bump") is the last thing to consider, not the "biggest part." I realize it's a big lump that hangs deceivingly from the roof of the port but there are other port mods that wake that exhaust port up more effectively--the smog bump is secondary by comparison and its removal has benefits only in the most aggressive and max effort of builds using these heads.

Substantial power can be had without touching the Thermactor boss, and while modifying it does offer improvement technically speaking, from a time and effort standpoint the gain is negligible on the bench (relatively to other mods) and virtually immeasurable on the dyno when the engine is cammed accordingly.

Bowl blending, short turn radius, and head bolt boss modifications take precedence over the Thermactor boss, especially when biasing the exhaust flow toward certain locations as it travels through the port.
« Last Edit: February 09, 2017, 11:16:15 AM by LakesOnly »

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Steveo909

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« Reply #6 on: February 09, 2017, 08:01:13 PM »
I talked to mr Bostick about it and he is going to be working my heads. He mentioned everything you did as well and will be cleaning everything up.
I'm not looking for huge power. Just want to make it breath better and be super reliable. I'm doing my best to keep the boat original. I grew up in this boat and it has been in the family since 1990.
Just looking for power where I can get it with the original heads, manifold, and water log exhaust.
Thanks for the info. I've learned more at SCJB than I have anywhere else.


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