243 heads i had cleaned up

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Aug 9, 2011 | 11:59 PM

#11

01GMC5.3

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From: Gantt, AL

Quote:

Originally Posted by grey matter 04

Heads will go on in 2-4 weeks. I need Lifters,head gaskets,head bolts and coolant.
I wont be able to give exact gains of just the heads since i swapped cams also.

I am not scared of the 918s! I dont see me pushing them enuff to stress or break them.
They rated for .600 lift i am only .550 lift.If a spring fails that gives me reason to never buy another comp product and build a real motor!

they are rated for a .625 lift not a .600 or atlest that is what the paper said in my box lol

Aug 10, 2011 | 12:43 AM

#12

Bumpers

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From: Tupelo Ms

Those heads look good.. I'm ready to see it run but not against me :p

You didn't have the exhaust side cleaned up any?

Aug 10, 2011 | 12:59 AM

#13

grey matter 04

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From: gonzales,LA

exhaust port it self was not touched
If they ever set a date for the meet we will run again!
Heads will be installed in the next 3 weeks or so.
I need injectors,i maxed out the stocks at 100% duty cycle on the 212/218 cam

Last edited by grey matter 04; Aug 10, 2011 at 10:01 AM.

Aug 10, 2011 | 01:37 AM

#14

AKlowriderZ71

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From: Wyoming

The exhaust side really must be worked to see good gains.

Aug 10, 2011 | 03:00 PM

#15

N20GMC

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From: Tuscaloosa, AL

The exhaust port on a LS6 head flows 10 to 20 cfm more than a 706 head exhaust port. So he is still gonna see pretty good gains.

Aug 10, 2011 | 03:34 PM

#16

grey matter 04

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From: gonzales,LA

at .550
..........intake exhaust
706 flows 221 and 168
243 flows 256 and 180

Definately gain some flow not to mention the valve work will also help out.
they claim 15-20cfm with the valve work i had done

Aug 10, 2011 | 11:07 PM

#17

Bumpers

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From: Tupelo Ms

Sweet ready to see what kind of gain you get from this whole deal.

Aug 11, 2011 | 08:01 AM

#18

1989k1500

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From: Ravenna, MI

Dont the 5.3 heads have a 57cc chamber?

Aug 11, 2011 | 09:36 AM

#19

ltr450ryder

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From: wi.... winters sucks

61.15 is stock on mine 862 and 706 heads

Aug 23, 2011 | 07:43 PM

#20

chevysten

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From: Huffman,tx

I have 25k on my comp918 springs with no probs.I too just recently bought some 243's and just got my new comp 918's retainers and locks and there going to the machine shop tomorrow to have some work done.Good luck with the heads,and I'll be installing mine in a couple weeks and then a retune!