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#1
12-21-2023, 10:10 PM
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Looking for valve relief sizes on TRW/Sealed Power pistons.
The 389 I just picked up came with a detailed parts list for its rebuild. It lists the pistons as Sealed Power L-2269-030. I know they're .030 over but I am wondering about the valve relief size and if they are going to work with later heads.
I came up with information on clearances and dishing them when I did a search. Thanks in advance for any information.
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#2
12-21-2023, 10:20 PM
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According to my old 2000 Speed -Pro catalog is says -3cc
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#3
12-22-2023, 01:17 AM
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Quote:
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#4
12-22-2023, 01:18 AM
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Quote:
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#5
12-22-2023, 07:01 AM
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The valve notches in those 389 Pistons due to the earlier heads 20 degree valve inclination angle will be ( 1) deeper. ( 2) not as wide, ( 3) in the wrong place for the later heads 14 degree inclination angle.
If your going to run iron or aftermarket heads with about a 72 CC chamber then your going to be limited to about running no more then about .440" lift depending on a few build detail factors.
__________________
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! |
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#6
12-22-2023, 04:40 PM
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Quote:
Thanks for the information.
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#7
12-22-2023, 06:24 PM
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So I guess your pistons look like these as found on EBay?
If so then each valve notch looks like 3 CCs for a total of 12 CCs.
__________________
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! |
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#8
12-23-2023, 03:17 PM
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I haven't pulled a head yet to confirm. The engine was said to ping badly. It's a .030 389 with 092 heads and a xr276 HR cam with 1.6 rockers.
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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