Milled Lt1 heads
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Milled Lt1 heads Was just wondering if anyone has milled their Lt1 heads. If so, how much did you mill and what kind of CR did you achieve/gain? I was thinking of milling mine in the future after I get a bigger cam, which would allow me to do so.
Originally Posted by dhdenney
Was just wondering if anyone has milled their Lt1 heads. If so, how much did you mill and what kind of CR did you achieve/gain? I was thinking of milling mine in the future after I get a bigger cam, which would allow me to do so.
My heads are 51cc with a ZERO deck block and a CC 306 cam and I have no p/v clearence problems. The total compression is 12.344:1 and it runs great on pump gas.
Stock LT1 heads are 58cc
Stock LT1 heads are 58cc
Originally Posted by solid95z
My heads are 51cc with a ZERO deck block and a CC 306 cam and I have no p/v clearence problems. The total compression is 12.344:1 and it runs great on pump gas.
Stock LT1 heads are 58cc
Stock LT1 heads are 58cc
When you milled your heads, did you have to mill the intake also?
Thanks,
Jody J.
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Originally Posted by 00Z-28-LT1
man....i have a long block that i bought and was installing in my car but the intake will not fit cuz the heads were decked.......what do i do???
Scott
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Originally Posted by JodyJ
When you milled your heads, did you have to mill the intake also?
Thanks,
Jody J.
Thanks,
Jody J.
Originally Posted by 96-speed
Scott, did you personally measure your stock heads to be 58cc?
Ryan
Ryan
cxbx how the hell can you say the you are running 12.3 somthing compresion on pump gas and that its ok ..... thats crazy on 93 octang that would of knocked so much it would of blown up!!! 
talk abouy risking it all the time>>>>>
talk abouy risking it all the time>>>>>
Originally Posted by regorih
how the hell can you say the you are running 12.3 somthing compresion on pump gas and that its ok ..... thats crazy on 93 octang that would of knocked so much it would of blown up!!! talk abouy risking it all the time>>>>>
talk abouy risking it all the time>>>>>
Well....YOU do the math:0 deck block
51cc heads
.039 gaskets
3.48 stroke
-5cc pistons
How do you run 12.3x:1 compression on pump gas, it's called TUNING!!!!!
I have built motors that run more than that on pump gas. I took part in building a 434 C5 at Speed Demon Motorsports that had about 13.4x:1 and it runs on pump gas. It doesn't like it as much, dut it doesn't have any problems. My best friend Tony Shepherd, his hydraulic 396 is 12.6:1 and his runs fine on pump gas! Actually that car made 479 rwhp on pump gas. Thread Starter
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Originally Posted by regorih
how the hell can you say the you are running 12.3 somthing compresion on pump gas and that its ok ..... thats crazy on 93 octang that would of knocked so much it would of blown up!!! talk abouy risking it all the time>>>>>
talk abouy risking it all the time>>>>>
Originally Posted by dhdenney
I'm not as good on the math as Solid95z but when you run longer duration cams, the intake valves close later than a smaller duration cam would. The dynamic compression is thus reduced (more critical than static). The bigger the cam, shoot for the sky on compression. That is why I am having a custom cam ground with some advance in it--to get my dynamic CR up into a better range since it will be SO low with long duration in a relatively low 10.8:1 motor.
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How much advance would you guess I would need with about a 239/248 cam? I imagine the guys at Comp will have a handle on that but just for the sake of discussion....... If I can hit money on this cam, then I can skip the head milling!
Originally Posted by solid95z
Exactly right!!! Typically the more duration you have the more compression you can run becuase the valve is closing later and will bleed off the extra compression. The CC306, which I have, bleeds off compression very well, which allows me to run a higher compression.