243 Heads Help

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Aug 21, 2012 | 02:04 PM

Stilo

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From: Santa Ana, CA

243 Heads Help

Just bought these 243 heads on CL for $200, the guy i bought them from said he built a 5.3 truck eng and put these on, and a few min after starting the enging he started to hear noizes and turned out he blow 2 rods and bent 3 valves on these 243. He bought them from a shop that did a valve job before and said they refaced them but didnt mill them but he was not sure. I went to a local shop but they said they didnt look to be milled but they were not 100% sure. I would like to put these on my LS1 and swap out my 853 for 243 with TSP 224r and LS6 intake.

CAN ANY ONE TELL IF THESE HEADS HAVE BEEN MILLED THE LOOK STOCK BUT IM NOT SURE! THANKS

Aug 21, 2012 | 02:11 PM

scarybowtie

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From: durant, ok

Best thing to do would be to have someone cc the chamber. But I'll try and rember to put the calipers on mine this afternoon

Aug 21, 2012 | 04:53 PM

Stilo

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How much do CC test run and if some one has a set of 243 heads can you take pics of the intakes so i can see if they match mine, Thanks

Aug 22, 2012 | 12:04 PM

Stilo

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I seen a few other post most say that the stock length is 4.75 on unmilled 243 heads, can any one confirm this?

243 Specs

Casting Number 243
LS6/LS2
01+ 5.7L Corvette/05-07 6.0 Corvette
Material: Aluminum
Combustion Chamber Volume: 64.45cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Last edited by Stilo; Aug 22, 2012 at 12:15 PM.

Aug 22, 2012 | 02:50 PM

RezinTexas

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From: Katy, TX

you can measure the cc's yourself for less than $5 and 5 minutes. engine oil, cold medicine syringe, plexiglass, grease for seal between plexiglass and head deck. if done carefully, it is extremely accurate.