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Old February 12th, 2009, 06:31 PM   #21
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Some one seriously school me on this!I was obviously told wrong on how this whole thing works. What should I get the heads milled to? As of right now the car ran better on mid grade than it did on regular.
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Old February 12th, 2009, 06:45 PM   #22
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Some one seriously school me on this!I was obviously told wrong on how this whole thing works. What should I get the heads milled to? As of right now the car ran better on mid grade than it did on regular.
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Old February 12th, 2009, 06:48 PM   #23
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In reality if the has AL heads you can get by with 93 oct.
I respectfully disagree - he does not have the engine management to cope with 12:1 on pump gas.
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Old February 12th, 2009, 06:50 PM   #24
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Some one seriously school me on this!I was obviously told wrong on how this whole thing works. What should I get the heads milled to? As of right now the car ran better on mid grade than it did on regular.
If you're taking it to a reputable builder, tell him to make it run on midgrade - premium if you can afford it. He will know what to do with machining, but you really can't just go by "milling the heads" - your piston shape, deck height and combustion chamber will all need to work together to run well.

Talk to your builder and listen to him.
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Old February 12th, 2009, 06:54 PM   #25
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Originally Posted by ScOoTeR View Post
If you're taking it to a reputable builder, tell him to make it run on midgrade - premium if you can afford it. He will know what to do with machining, but you really can't just go by "milling the heads" - your piston shape, deck height and combustion chamber will all need to work together to run well.

Talk to your builder and listen to him.

Alright thanks. How much Hp difference would setting it for mid grade make than setting in for 93 make?
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Old February 12th, 2009, 06:55 PM   #26
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AJ if i was you i woud run 10% or 20% nothing over that or you'll blow a rod or something....


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Old February 12th, 2009, 07:05 PM   #27
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Alright thanks. How much Hp difference would setting it for mid grade make than setting in for 93 make?
It will probably be a wash: higher compression ratio improves combustion efficiency, however, you will probably have to run less spark. Spark timing, depending where you are on the MBT curve, is more potent than compression ratio.

I would rather have an engine I could run midgrade in and run a bit more advance than a high compression motor that I had to pull spark out of to run without detonating. Besides, you're young and don't have tons of money - you'll cheap on fuel when you're broke and running regular unleaded in a mild engine is better than on something with so much compression.
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Old February 12th, 2009, 07:26 PM   #28
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I respectfully disagree - he does not have the engine management to cope with 12:1 on pump gas.
And I'd have to disagree with that. It can be done with aluminum heads, and probably even with iron. Your cam profile plays a large factor with what you can get away with.
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Old February 12th, 2009, 07:36 PM   #29
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AJ, you need to do SOME research before pulling a number out of your ass and expecting to get that type of power from just shaving the heads.

To make that kind of power you need a combination of parts as stated above. Pistons are needed to net the type of compression you want in combination with shaving the heads....also different thickness head gaskets. You'd have to have work done to the heads so they flow better (port and polish), bigger valves, etc... and also the type of cam.

Just for reference, my mopar 360 has flat top pistons, I'm somewhere around 10:1 compression, heads are port and polished, and i have a mild cam.... I'm NOWHERE near 450hp. I'd be lucky to have 300hp at the crank.

Also what engine is this? Please tell me its not the 305.....

Oh and if you shave the heads to much, you'll have to get your intake shaved down as well, otherwise it will not fit.
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Old February 12th, 2009, 07:42 PM   #30
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Run 23:1 compression. There is a fuel out there that is so good it is more expensive than premium gasoline and it loves this compression ratio. This fuel is so good some faggety actor named Vin uses it for his last name.
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Old February 12th, 2009, 08:05 PM   #31
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Run 23:1 compression. There is a fuel out there that is so good it is more expensive than premium gasoline and it loves this compression ratio. This fuel is so good some faggety actor named Vin uses it for his last name.
bwahahahaha
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Old February 12th, 2009, 08:11 PM   #32
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Originally Posted by ScOoTeR View Post
It will probably be a wash: higher compression ratio improves combustion efficiency, however, you will probably have to run less spark. Spark timing, depending where you are on the MBT curve, is more potent than compression ratio.

I would rather have an engine I could run midgrade in and run a bit more advance than a high compression motor that I had to pull spark out of to run without detonating. Besides, you're young and don't have tons of money - you'll cheap on fuel when you're broke and running regular unleaded in a mild engine is better than on something with so much compression.
SO just tell the builder I want to run on Midgrade. What compression should I shoot for?

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Originally Posted by Plato2k5 View Post
AJ, you need to do SOME research before pulling a number out of your ass and expecting to get that type of power from just shaving the heads.

To make that kind of power you need a combination of parts as stated above. Pistons are needed to net the type of compression you want in combination with shaving the heads....also different thickness head gaskets. You'd have to have work done to the heads so they flow better (port and polish), bigger valves, etc... and also the type of cam.

Just for reference, my mopar 360 has flat top pistons, I'm somewhere around 10:1 compression, heads are port and polished, and i have a mild cam.... I'm NOWHERE near 450hp. I'd be lucky to have 300hp at the crank.

Also what engine is this? Please tell me its not the 305.....

Oh and if you shave the heads to much, you'll have to get your intake shaved down as well, otherwise it will not fit.
No its a 1970 LT1 4 bolt 350 bored to 355 out of a 70's vette with:

TRW 174 Comp Cam .468 Lift.
Flat top pistons with ears cut for valve clearance.
Edelbrock RPM performer Intake
Edelbrock 650 carb.
MSD Coil
MSD Box
Heads are cast # 462624 (http://www.mortec.com/castnum.htm)
Not sure on wether or not there ported or polished. It does look like someone tried to open up the exhaust ports with a dremel or something. But I don't know.


Thats all I know of that it has.
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Old February 12th, 2009, 08:14 PM   #33
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There are a lot of things you need to do to gain that type of power. It is not cheap!
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Old February 12th, 2009, 08:25 PM   #34
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Honestly, dump those heads. I would not waste any money on those castings. By the time you spend money doing work to those, you can get a much better new assembled casting for probably the same price.
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Old February 12th, 2009, 08:31 PM   #35
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I got an idea get mommy 2 buy u a new motor. Seems like u get all your shit handed 2 u.
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Old February 12th, 2009, 09:06 PM   #36
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I got an idea get mommy 2 buy u a new motor. Seems like u get all your shit handed 2 u.
I got an idea... fuck off.Go stuff your boy friends cock in your mouth. My mom works all the time to take car of my little sisters. My parents are divorced. Mom pays house paymnet and everything by her self. So fukc you.
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Old February 12th, 2009, 09:09 PM   #37
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Honestly, dump those heads. I would not waste any money on those castings. By the time you spend money doing work to those, you can get a much better new assembled casting for probably the same price.
I have some chevy truck heads. I cant remember the casting number though. The local machine shop said they were GM Torque heads. What about those?
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Old February 12th, 2009, 09:09 PM   #38
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There are a lot of things you need to do to gain that type of power. It is not cheap!
Nos lol
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Old February 12th, 2009, 09:11 PM   #39
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I got an idea... fuck off.Go stuff your boy friends cock in your mouth. My mom works all the time to take car of my little sisters. My parents are divorced. Mom pays house paymnet and everything by her self. So fukc you.
I just don't get why people ride you so much. You seem like such a nice kid.
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Old February 12th, 2009, 09:16 PM   #40
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all that power and what kind of trans are you going to run??? what rear end??? gear??? stall?? how are you going to get it to hook up??? them cars like to twist!
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