317s vs 243s

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02-16-2009 | 08:50 PM

#11

SincalT/A

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From: Currently In suspense.

If you get ls6 243's the better valves are a plus too.

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02-16-2009 | 09:07 PM

#12

dirt track racer 81

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From: Hennessey, Oklahoma

Quote:

Originally Posted by Low_LQ4

Can't you just mill the heads to raise the comp up instead of buying new heads since they flow the same?

you would have to mill them .045-.050 to be the same as the 243 head

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02-16-2009 | 10:05 PM

#13

Mangled03gmc

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From: In a van DOWN BY THE RIVER

Quote:

Originally Posted by dirt track racer 81

you would have to mill them .045-.050 to be the same as the 243 head

Then you could poss start running into intake fittment issues

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02-18-2009 | 10:02 PM

#14

NateZQ8

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From: Iowa

Depending on your gaskets and such.....you could be looking at a 10.9 to 11.0 according to my handy dandy DCR calc.

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02-19-2009 | 01:16 AM

#15

Modern_Muscle

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From: Lubbock Texas

off the original posters question

anyone know what the CR of a 5.3 with PRC stage 2.5 LS6 heads will be?

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02-19-2009 | 07:30 PM

#16

NateZQ8

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From: Iowa

Flat tops or dished pistons?

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02-23-2009 | 12:02 AM

#17

Modern_Muscle

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From: Lubbock Texas

I would guess dish? its stock rotating assy, 03 model.

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02-23-2009 | 05:59 AM

#18

GMCtrk

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From: Dallas

It will probably be somewhere around 9:1

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