having some trouble sourcing oversize piston for my 161
It appears that the company who did manufacture these went under this year.
Im getting the engine work done through HM/GEM on the nsw central coast so they're trying to source a set first before boring.
If anyone could recommend a different supplier let me know
Also he ran it past me as to how far i wanted to bore ie.060" - .120" (167 - 173)! I didnt think you could go over say .080" unless the 161's have a very cylinder wall.
pistons for 161
Started by
_gtr161s_
, Jun 16 2008 04:28 PM
7 replies to this topic
#2
FastEHHolden
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Posted 16 June 2008 - 05:29 PM
I'm willing to bet you can get it to 192...I had a 179 + .122 . It sort of makes sense that all the blocks are the same..its just the bore size thats different....one way to be sure is drill a few different dead blocks thru the front of number 1 bore and see what the difference is.....I have a 161 I can check for you.
#3
_gtr161s_
_gtr161s_
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Posted 16 June 2008 - 07:33 PM
you could be right
this guy has been doing it since noah was a boy so maybe there's some truth it
this guy has been doing it since noah was a boy so maybe there's some truth it
#4
View GaragePosted 17 June 2008 - 08:57 PM
dont go and destroy a block just get the reconditioner to sonic test the bores and that will tell you how thick they still are and whether they will handle a =080 rebore
peter
peter
#5
_gtr161s_
_gtr161s_
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Posted 17 June 2008 - 09:01 PM
just an update to tracking down pistons....getting a set of +60 thou endurotech pistons sent up from vic
Also info on boring the red 6 blocks...spoke to the old fella who runs the shop and he said that he's bored a 202 out +120 thou (216).
It seems that when the blocks were originally cast they must have the same water jacket area only smaller pot sizes...so maybe the 138 (2250) could end up with the pistons of a 202
Also info on boring the red 6 blocks...spoke to the old fella who runs the shop and he said that he's bored a 202 out +120 thou (216).
It seems that when the blocks were originally cast they must have the same water jacket area only smaller pot sizes...so maybe the 138 (2250) could end up with the pistons of a 202
#6
Dr Terry
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Posted 19 June 2008 - 09:23 AM
Hi Guys.
Sorry to burst the bubble, but many of the castings are different. The only ones that share the same bore castings are 179, 186 & 202, these can all be bored to 3.625" + 0.060" safely. Good blocks (i.e those with nicely centred casting cores) can be bored further.
Some 149 blocks won't even bore to stock 161 size. Likewise some 161 blocks won't go out to 173 size. Most 173s will go to stock 179, but not to 186. As piquet said, get the block sonically tested before boring.
Dr Terry.
Sorry to burst the bubble, but many of the castings are different. The only ones that share the same bore castings are 179, 186 & 202, these can all be bored to 3.625" + 0.060" safely. Good blocks (i.e those with nicely centred casting cores) can be bored further.
Some 149 blocks won't even bore to stock 161 size. Likewise some 161 blocks won't go out to 173 size. Most 173s will go to stock 179, but not to 186. As piquet said, get the block sonically tested before boring.
Dr Terry.
#7
FastEHHolden
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Posted 19 June 2008 - 10:22 AM
Your not sorry at all 
Core shift is the reason I got my HP fitted with liners...because by the time you ultrasonically test it and run around to find another block if you need to ...its just easy to get your block bored and lined...then you get the bore thickness you need and you aren't stuck with 60's metallurgy.
I can still test the theory on my coffee table block (161) and the handgrenade I built at christmas (202)
Core shift is the reason I got my HP fitted with liners...because by the time you ultrasonically test it and run around to find another block if you need to ...its just easy to get your block bored and lined...then you get the bore thickness you need and you aren't stuck with 60's metallurgy.
I can still test the theory on my coffee table block (161) and the handgrenade I built at christmas (202)
#8
_gtr161s_
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Posted 19 June 2008 - 09:24 PM
dont think I'll rush out and buy .120" over and risk stuffing a 2600s block
got the .060" over today....last set that they could source between nsw & vic
got the .060" over today....last set that they could source between nsw & vic
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