no casting number on heads?
Thread Starter
Burning Brakes
Joined: Sep 2005
Posts: 1,141
Likes: 1
From: Kona, Treasure coast Hawaii, Florida
no casting number on heads?
checked out my heads on my 99 FRC and they have no casting to numbers like they have been milled off then polished... car looked like it had some mods before i got it that he had taken off.. do you think i have ported stock heads?
Safety Car
Joined: Aug 2000
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From: St. Joseph MO
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Le Mans Master
Joined: Jul 1999
Posts: 5,005
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From: jackson nj
I've seen the same thing on my buddies car, for what ever reason the on passenger side, where you'd expect to see the casting number clearly, it seemed to have been milled clean and shiny. His car however, was purchased new and he was the original owner so it never had the heads off.
Team Owner
Joined: Sep 2003
Posts: 43,084
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From: Raleigh / Rolesville NC
853 and 241 are basically identical.
853 was used on 99-00 LS1 engines.
241 was used on 01-04 LS1 engines.
They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports.
The 243 head is the 01+ LS6/LS2 head.
It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.
All three came with 2.00" intake valves, and 1.55" exhaust valves.
Of the three, the 243 (Z06) head is the most desirable for flow, and is the most popular base for further porting/modifying. Not many people mess with porting LS1 heads anymore.
Drifting
Joined: Jan 2007
Posts: 1,865
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From: WTB Kook 2" long tube 4 C5 TEXAS
LOL! my car is the same, my car is a 99 and on the passenger side of the front of the heads the number is not there....same thing like if it was milled off or something. Look at the rear of the head or look at the driver side of the car but, you will need to remove the alternator. My car has 853 casting heads.
Roger
Roger
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Thread Starter
Burning Brakes
Joined: Sep 2005
Posts: 1,141
Likes: 1
From: Kona, Treasure coast Hawaii, Florida
LOL! my car is the same, my car is a 99 and on the passenger side of the front of the heads the number is not there....same thing like if it was milled off or something. Look at the rear of the head or look at the driver side of the car but, you will need to remove the alternator. My car has 853 casting heads.
Roger
Roger
Melting Slicks
Joined: Mar 2006
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From: Jax Florida
Thread Starter
Burning Brakes
Joined: Sep 2005
Posts: 1,141
Likes: 1
From: Kona, Treasure coast Hawaii, Florida
