Budget heads: PP Stage III LS6's or PP stage III 5.3's? Pros and Cons?
#1
Budget heads: PP Stage III LS6's or PP stage III 5.3's? Pros and Cons?
Kind of what the title says. I am tore between the 2. Besides the small $$ difference. What makes one better then the other. Or am I just "splitting Hairs" as JRP puts it.
Just want a weekend warrior and a fun drag car. Not my daily driver either.
Let me know.. thanks
Just want a weekend warrior and a fun drag car. Not my daily driver either.
Let me know.. thanks
#3
Originally Posted by MUSTANGEATER
I would probably go with the LS6 style heads.
Was thinking of the LS6 III's as they have slightly bigger valves and will net more flow. But, I would think that I would have to go with a smaller cam? correct?
Like your call sign.. I killed 3 at the track last time I went!!
#6
TECH Senior Member
Get a cam that allows you to run 11.0>11.5:1 with a quench of .030>.035 without notching the pistons. Quench is relative to your piston to deck measurement and your gasket thickness
Quench = PTD - Compressed Gasket thickness.
you do not have to think too big to make 400. I'm at 429 with a 224/220 cam and PRC 2.5/ 5.3L and 11.0:1 static Compression
Quench = PTD - Compressed Gasket thickness.
you do not have to think too big to make 400. I'm at 429 with a 224/220 cam and PRC 2.5/ 5.3L and 11.0:1 static Compression
#7
Originally Posted by PREDATOR-Z
Get a cam that allows you to run 11.0>11.5:1 with a quench of .030>.035 without notching the pistons. Quench is relative to your piston to deck measurement and your gasket thickness
Quench = PTD - Compressed Gasket thickness.
you do not have to think too big to make 400. I'm at 429 with a 224/220 cam and PRC 2.5/ 5.3L and 11.0:1 static Compression
Quench = PTD - Compressed Gasket thickness.
you do not have to think too big to make 400. I'm at 429 with a 224/220 cam and PRC 2.5/ 5.3L and 11.0:1 static Compression
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#10
TECH Senior Member
yeah, that is because the 59cc are welded chambers so they should be OEM, but valves are bigger so PTV changes.
This is why I said choose the heads, compression and gasket, then trow in a cam that fits without notching.
You'll make more power that way, than running bigger cam with less Compression and wider quench.
This is why I said choose the heads, compression and gasket, then trow in a cam that fits without notching.
You'll make more power that way, than running bigger cam with less Compression and wider quench.
#11
Originally Posted by PREDATOR-Z
yeah, that is because the 59cc are welded chambers so they should be OEM, but valves are bigger so PTV changes.
This is why I said choose the heads, compression and gasket, then trow in a cam that fits without notching.
You'll make more power that way, than running bigger cam with less Compression and wider quench.
This is why I said choose the heads, compression and gasket, then trow in a cam that fits without notching.
You'll make more power that way, than running bigger cam with less Compression and wider quench.
#12
TECH Senior Member
http://www.rbracing-rsr.com/compstaticcalc.html
average piston deck height is .007 out of hole, so negative figure is needed in the calc.
With 59cc chambers and .045, you are looking at 11.66
With a 62 cc 5.3 and .045, you are looking at 11.2
with 64cc 5.3 and .045, you are looking at 10.91
With 64 cc and .040, you are looking at 11.05
and with 62cc and .040 it is 11.34
that should give you an idea. Mind you these calcs are close ballpark, actual will differ a tiny bit.
average piston deck height is .007 out of hole, so negative figure is needed in the calc.
With 59cc chambers and .045, you are looking at 11.66
With a 62 cc 5.3 and .045, you are looking at 11.2
with 64cc 5.3 and .045, you are looking at 10.91
With 64 cc and .040, you are looking at 11.05
and with 62cc and .040 it is 11.34
that should give you an idea. Mind you these calcs are close ballpark, actual will differ a tiny bit.
#13
I wouldnt go with a stage 3 head, without bigger displacement. PP heads arent milled unless you want them milled. I just had a set of PP stage II LS6 heads with 2.02 intake valves, 1.60 exhaust valves, & 62cc combustion chambers, with the stock height gasket that they provide I had no PtoV clearence issues. The CR was right at 10.7-1 & best of all, the heads pulled like a raped ape, with the F13 cam.
#14
Vann is right, our heads will be at factory height. The stage II head would better suit your needs. If we do a 59cc chamber with the GM MLS gaskets we send, you will have approx. 11-1 compression.
#17
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Question.... have you thought about waiting for some of the aftermarket casts coming out this winter after SEMA and having those worked over?
DART has a 225 Runner head that flows 300 @ .500 .... http://www.dartheads.com/manager/uploads/LS1Flyer.pdf
Jegs has those listed as 640 per head assembled.... and I do believe that is slightly cheaper than LS6 heads
DART has a 225 Runner head that flows 300 @ .500 .... http://www.dartheads.com/manager/uploads/LS1Flyer.pdf
Jegs has those listed as 640 per head assembled.... and I do believe that is slightly cheaper than LS6 heads
#18
Originally Posted by SporkLover
Question.... have you thought about waiting for some of the aftermarket casts coming out this winter after SEMA and having those worked over?
DART has a 225 Runner head that flows 300 @ .500 .... http://www.dartheads.com/manager/uploads/LS1Flyer.pdf
Jegs has those listed as 640 per head assembled.... and I do believe that is slightly cheaper than LS6 heads
DART has a 225 Runner head that flows 300 @ .500 .... http://www.dartheads.com/manager/uploads/LS1Flyer.pdf
Jegs has those listed as 640 per head assembled.... and I do believe that is slightly cheaper than LS6 heads