heads milled .045

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Feb 3, 2011 | 11:04 PM

#11

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From: Tupelo Ms

Quote:

Originally Posted by 1slow01Z71

Go out and tag the rev limiter a couple of times real hard, that is the true test.

Believe me once she's tuned up good it will prolly see the rev limiter a few times so we will get to find out how close it is lol

Feb 4, 2011 | 07:50 AM

#12

Coban

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From: League City, TX

Quote:

Originally Posted by dmelvin

I've got a set of 243's that are milled .03 and was told that they were 59cc cambers...

Looking around I saw somewhere that .006=1cc?

I guess I'm confused as to how your's being milled down .045 would bring you to 59 and not somewhere around 56.5?

Can someone please school me?

His were actually measured, so I think his would be more true.

.006 = 1cc is really an approximation. The more you take off, the less accurate it will be. This is due to the bowl shape of the chamber.

Feb 4, 2011 | 08:23 AM

#13

dmelvin

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From: Rock Port, MO

Quote:

Originally Posted by Coban

Makes me wonder how big my chambers actually are then.

I figured since his were measured, they were probably accurate, I wasn't trying to say that his machinist didn't know what he was doing, I was trying to say that I didn't know what I was doing

Feb 4, 2011 | 09:28 AM

#14

fastrt

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From: Midlothian, Texas

I had to take .050" off my 5.3 heads to get to a 55cc chamber. I have the same cam 226/230 esp, with no ptv. I hit 7200 often, but I have arp rod bolts too.

Feb 4, 2011 | 12:05 PM

#15

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From: Tupelo Ms

Yea the more you mill off the less cc it take out. Because of the bowl shape of the combustion chambers... The guy who done my heads builds a lot of drag and race engines and has been in business for a long time.. He knows what he's doin

Feb 4, 2011 | 12:05 PM

#16

Rhino79

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From: Cabot, AR

I think on the LS heads its more like .007 per cc. I have helped on 2 setups that used heads with .045 cut with no fitment or ptv problems what so ever.

Feb 4, 2011 | 09:49 PM

#17

05gmcsierra

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From: van nuys CA

i got my 799s milled .030 and pat g said it was 59.5 cc chambers making my compression 10.5 on my 5.3... im running 5.3 l33 with flat top pistons tho..

Feb 4, 2011 | 10:55 PM

#18

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From: Tupelo Ms

Well I'm just sayin mine were measure with a piece of glass and a dripper and he milled them till I had 59cc chambers

Feb 4, 2011 | 10:59 PM

#19

dmelvin

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From: Rock Port, MO

All good, didn't mean to cause confusion or argument or anything, just curious. I hope mine are 59cc, since I have have everything kinda planned out for that. lol

Feb 4, 2011 | 11:03 PM

#20

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From: Tupelo Ms

Everyone said different numbers.. I've heard 30. 35. 40 etc

Pat said 59cc chambers was 10.8 with a stock head gasket but everyone else said 11to1

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