just curious
09-15-2005, 03:02 PM
#1
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just curious
would it be a good idea to put a set of heads from a 5.7 98' camaro ss on a 6.0 block? would it make pretty decent hp/tq? what would this do to the compression? would everything else from the 5.3 work with this setup(intake, fuel injection, wiring, etc...)? what kind of cam would be good for this setup? this is my daily driver. i want something that is very driveable but decent power.
09-15-2005, 11:41 PM
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Tribe Shaman
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the 98 5.7 heads have a 66.67 cc chamber, smaller valves and less flow.
the 6.0 heads have a 71.06 cc chamber, larger valves and a much higher flow.
everything from a 5.3 should work.
this is a case of a trade off, higher compression for less top end flow.
low end torque for top end power.
if it was me i would shave the 6.0 heads to increase compression while keeping the flow rate for the top end, use a thiner gasket and shim the rockers,
the 6.0 heads have a 71.06 cc chamber, larger valves and a much higher flow.
everything from a 5.3 should work.
this is a case of a trade off, higher compression for less top end flow.
low end torque for top end power.
if it was me i would shave the 6.0 heads to increase compression while keeping the flow rate for the top end, use a thiner gasket and shim the rockers,
09-16-2005, 04:14 AM
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thanks for the input. suppose i took the cheap way out and just slapped the 5.7 heads on the 6.0 block with something around a 212/218 cam, would i get more power or less than what i have with the stock 5.3? any estimates of what the hp/tq would be? that's just a guess on the cam im not sure what to do with it yet, still working on the heads.
09-17-2005, 02:45 AM
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the 6.0 puts out more power then the 5.3
the 6.0 with 5.7 heads will put out more power then a 5.3
the 6.0 with 6.0 heads will put out more power then the 6.0 with the 5.7 heads.
all 3 running the same cam 212/218 at 522/529
the 6.0 with 5.7 heads will put out more power then a 5.3
the 6.0 with 6.0 heads will put out more power then the 6.0 with the 5.7 heads.
all 3 running the same cam 212/218 at 522/529
09-17-2005, 07:04 AM
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thanks for the input pappy dan. i hate to sound like a dumb-***, but could you be a little more specific about the power differences in theses heads. a good guess of the hp will be good if ya can do that. for example "the 6.0 block with 5.7 heads should get you around 330-350hp" something like that. if anyone has any idea feel free to post. thanks
09-17-2005, 02:56 PM
#6
Originally Posted by PappyDan
the 98 5.7 heads have a 66.67 cc chamber, smaller valves and less flow.
the 6.0 heads have a 71.06 cc chamber, larger valves and a much higher flow.
everything from a 5.3 should work.
the 6.0 heads have a 71.06 cc chamber, larger valves and a much higher flow.
everything from a 5.3 should work.
09-18-2005, 03:50 AM
#7
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Bud your thinking about the 01-04 LS6 5.7 heads the 97-98 LS1 5.7 heads are not the same.
the ports, valves are smaller and the combustion chamber is larger.
97-98 LS1
ports in/ext 200/70 Com. Cham. 66.67 valves on LS1 ( I think ) 1.98 and 1.55
01-04 LS6 and 6.0
ports in/ext LS6 and the 6.0 210/75 Com Cham. LS6 61.15, the 6.0 71.06.
the valves on the LS6 and the 6.0 2.00/ 1.55
I hate working weekends and I feel brain dead, hope I explain this right for you south.
a dyno graph will show horse power as a curve, 0 at start, by a certain rpm will be the peek and after that power starts to drop off, the higher the rpm's past the peek the more loss in power you will see.
the stock cam shaft stops making horse power at 4800 rpm's on the 6.0 that peek horse power is 345 as the rpm's climb past the peek and up to 6000 rpm's the horse power has dropped to around 270.
4800 to 6000 is a loss of 1200 rpm's of horse power.
change the camshaft to your 212/218.
now peek horse power has changed, the power curve has changed, the drop past peek has changed, with the new cam peek horse power is around 5400, horse power is around 375,
run the rpm's up to 6000 and the drop in horse power is around 340.
5400 to 6000 is a loss of 600 rpm's of horse power.
now change out the heads to your 98 5.7 heads.
smaller valves, smaller ports, higher compression, the power curve has changed again.
with the new heads peek power is at 5100 rpm's but due to the higher compression from 0 to 5100 is a straighter line in horse power showing a faster gain,, but at 5100 rpm's the peek horse power is 355, 20 horses less and 300 rpm's lower then before due to the smaller valves and ports run the rpm's up to 6000 and your horse power has dropped to 305 where as before it was 340.
5100 to 6000 is a loss of 900 rpm's of horse power.
this is why your head swap is a trade off.
low end torque for top end power.
a good jump at the line but half way down the track you will reach your peek to only be passed at the finish line in the higher rpm range where the most horse power counts.
if you dont mind im going to get a beer now.
the ports, valves are smaller and the combustion chamber is larger.
97-98 LS1
ports in/ext 200/70 Com. Cham. 66.67 valves on LS1 ( I think ) 1.98 and 1.55
01-04 LS6 and 6.0
ports in/ext LS6 and the 6.0 210/75 Com Cham. LS6 61.15, the 6.0 71.06.
the valves on the LS6 and the 6.0 2.00/ 1.55
I hate working weekends and I feel brain dead, hope I explain this right for you south.
a dyno graph will show horse power as a curve, 0 at start, by a certain rpm will be the peek and after that power starts to drop off, the higher the rpm's past the peek the more loss in power you will see.
the stock cam shaft stops making horse power at 4800 rpm's on the 6.0 that peek horse power is 345 as the rpm's climb past the peek and up to 6000 rpm's the horse power has dropped to around 270.
4800 to 6000 is a loss of 1200 rpm's of horse power.
change the camshaft to your 212/218.
now peek horse power has changed, the power curve has changed, the drop past peek has changed, with the new cam peek horse power is around 5400, horse power is around 375,
run the rpm's up to 6000 and the drop in horse power is around 340.
5400 to 6000 is a loss of 600 rpm's of horse power.
now change out the heads to your 98 5.7 heads.
smaller valves, smaller ports, higher compression, the power curve has changed again.
with the new heads peek power is at 5100 rpm's but due to the higher compression from 0 to 5100 is a straighter line in horse power showing a faster gain,, but at 5100 rpm's the peek horse power is 355, 20 horses less and 300 rpm's lower then before due to the smaller valves and ports run the rpm's up to 6000 and your horse power has dropped to 305 where as before it was 340.
5100 to 6000 is a loss of 900 rpm's of horse power.
this is why your head swap is a trade off.
low end torque for top end power.
a good jump at the line but half way down the track you will reach your peek to only be passed at the finish line in the higher rpm range where the most horse power counts.
if you dont mind im going to get a beer now.
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09-18-2005, 12:15 PM
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i was talking to a friend and they suggested keeping the 5.3 block and the 5.7 heads just change the pistons to somethin like a flat top piston to boost the compression. anyone have any thoughts on that? btw thanks for all that pappy it was really helpful.
09-23-2005, 12:45 AM
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You would only be regaining the compression lost from adding the 5.7 heads if you were to swap the pistons in order to raise compression.
You would probably be best off just having the 5.3 heads ported, this would increase flow and keep compression the same.
The change is compression you are asking for will not benifit you greatly in a mild motor, and drivability will suffer. If you are building an all out race motor, THEN I would say go for it.
If you will kinda give us an idea of what you're looking for from a motor, what its going in, and the goals you are trying to reach, we would be more than happy to help you out.
You would probably be best off just having the 5.3 heads ported, this would increase flow and keep compression the same.
The change is compression you are asking for will not benifit you greatly in a mild motor, and drivability will suffer. If you are building an all out race motor, THEN I would say go for it.
If you will kinda give us an idea of what you're looking for from a motor, what its going in, and the goals you are trying to reach, we would be more than happy to help you out.