Your TA was born with 6X heads of which there were two different chamber sizes, a -4 ( small chamber ) and -8 ( large chamber.
Your TA would have had the -4 and this thumbnail I posted is where you find out that info on the head.
With compression that low either that head has burnt valves ( may need exh seats installed also ) and or it overheated , cracked the head and then blew out the head gasket.
If I recall right the 6XO head(s) are very large chamber California emissions heads.
Do not reuse any of the stock valves, get all 16 new ones .
I would get the heads fully checked out to see if there still usable..
Crower 68407 springs are a good replacement for stock length valves and they are a duel round wire spring like the originals.
Pay no attention to the GM2 or 7 as it’s
meaningless to head ID.
I hope your 73 block is ok, because that’s a good block .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 07-12-2025 at 01:33 PM.
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