Thread: cast vs aluminum heads
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11-06-2006 04:22 AM #1
cast vs aluminum heads
If I switch my 383 from cast heads to aluminum ,How much can I safely raise
the compression ? What are the general rules when making this switch?
Thanx Ed
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11-06-2006 05:51 AM #2
Generally speaking, you can run 1 pt more compression with aluminum heads. But it all comes down to your DCR. Stay under 8.5 and you should be fine with premium gas. I run 10.6 Static compression with 8.46 Dynamic compression. No problems with 92/93 octane.
Lynn
'32 3W
There's no 12 step program for stupid!
http://photo.net/photos/Lynn%20Johanson
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11-06-2006 02:59 PM #3
Originally Posted by rumrumm
I think I've been "leaving some on the table" with my conservative ideas.PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
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11-06-2006 03:08 PM #4
Maybe?..... but like the old bull and the young bull on the hill...I like the old bulls idea better, later on when guys have more exsperiance they can decide whether to walk or run down the hill depending on their needs.....I do get 1 warning before I get banned right ?
Last edited by shawnlee28; 11-06-2006 at 03:12 PM.
Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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11-07-2006 05:00 AM #5
I have not tried to run 89 octane because I am "on the edge" so to speak of being able to successfully run 92/93 octane. But I built the engine knowing that would be the case. It has a .039 quench area, AFR 190 heads, a CompCams 280 Magnum cam, Edelbrocks RPM intake and 750 carb. I a very satisfied with the performance and its street manners.
Lynn
'32 3W
There's no 12 step program for stupid!
http://photo.net/photos/Lynn%20Johanson
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11-07-2006 07:37 AM #6
I also have question on compression. I did a leak down test on my engine and all was good but i was wondering at 180 psi how do i figure out my compression?
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11-07-2006 05:20 PM #7
Originally Posted by rumrumm
Sorry for your loss of friend Mike McGee, Shine. Great trans men are few and far between, it seems. Sadly, Mike Frade was only 66 and had been talking about retirement for ten years that I know...
We Lost a Good One