How much to mill LT1 Trick Flow Heads for higher compression?
02-25-2007, 10:06 PM
#1
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How much to mill LT1 Trick Flow Heads for higher compression? I have a set of trick flow heads that I came into pretty cheap. I am not planning on forced induction so I was thinking of having the heads milled. (If I do anything at all later on I might do a 100 shot of nitrous.) These are being bolted to a stock LT1 short block.
I know with a stock gasket the trick flows will drop you close to 10 to 1. I was thinking I would try to bump them back up in the range of 10.5 - 10.8 to 1. I will be using a Fel-Pro 1074 head gasket and it has a .039 in. Compressed Thickness.
Now for the real question, how much will have to be milled in order to bump up the compression a half a point or so?
I know with a stock gasket the trick flows will drop you close to 10 to 1. I was thinking I would try to bump them back up in the range of 10.5 - 10.8 to 1. I will be using a Fel-Pro 1074 head gasket and it has a .039 in. Compressed Thickness.
Now for the real question, how much will have to be milled in order to bump up the compression a half a point or so?
Last edited by StrokerVette; 02-25-2007 at 10:27 PM.
02-25-2007, 10:24 PM
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Originally Posted by StrokerVette
I have a set of trick flow heads that I came into pretty cheap. I have a stock block LT1 that came out of a 95 Camaro. I am not planning on forced induction so I was thinking of having the heads milled. (If I do anything at all later on I might do a 100 shot of nitrous.)
I know with a stock gasket the trick flows will drop you close to 10 to 1. I was thinking I would try to bump them back up in the range of 10.5 - 10.8 to 1. I will be using a Fel-Pro 1074 head gasket and it has a .039 in. Compressed Thickness.
Now for the real question, how much will have to be milled in order to bump up the compression a half a point or so?
I know with a stock gasket the trick flows will drop you close to 10 to 1. I was thinking I would try to bump them back up in the range of 10.5 - 10.8 to 1. I will be using a Fel-Pro 1074 head gasket and it has a .039 in. Compressed Thickness.
Now for the real question, how much will have to be milled in order to bump up the compression a half a point or so?
02-25-2007, 10:31 PM
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Originally Posted by StrokerVette
Well it was a package deal, of new TFS heads, new 1.6 RR's, used but cleaned/flow matched 30lb bosch injectors, and gaskets for $1500.
02-26-2007, 09:20 AM
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Yea, I was just lucky I guess. Originally I planned to just send my heads to LE for porting, but I guess I will run these now. I am just trying to figure out how much needs to be shaved off. They really need to be resurfaced anyway before I bolt them down and I figure while I had them at the machine shop I would get the compression up a little.
02-26-2007, 10:24 AM
#7
Milling the heads does not bump up the compression as much as you may think. When you mill the heads the dont get the head any closer to the deck of the block, but simply make the combustion chamber a little smaller. Your best bet would be to get about .030 taken off of the heads, more if possible, and go with the impala head gasket. That would probably get you close to the stock number.
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02-26-2007, 01:30 PM
#9
My chambers were reworked but my heads were cut about that much and I run a Mr. Gasket .026 gasket for about 11.5.
As cast stock chambers would result in a little more compression yet could not put a number too it though as I do not know how much was removed from the chamber just that part of the porting is a bit of chamber work.
Stock is 10.4.
As cast stock chambers would result in a little more compression yet could not put a number too it though as I do not know how much was removed from the chamber just that part of the porting is a bit of chamber work.
Stock is 10.4.
02-26-2007, 09:57 PM
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Originally Posted by foggedz
Your best bet would be to get about .030 taken off of the heads, more if possible, and go with the impala head gasket. That would probably get you close to the stock number.
02-26-2007, 10:22 PM
#11
Originally Posted by StrokerVette
I spoke with LE today and this was real close to his recommendation. He said to shave them down .040 and go with the Impala gasket. I was planning on putting a 100 shot to this motor later on and I am a little hesitant to use the Impala gaskets because of the durability. I guess that I may spring for the Cometic gaskets. Do you guys think that would be necessary?
I have never heard of any durability issues with the impala gasket. I hope there are none eather, becuase thats what im going to be useing on my motor that will see 150-175 worth of nitrous.
With a thiner gasket and a tighter quench area the motor and gaskets should have a better chance of standing up to the pressures of nitrous.
