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SOLD Parts The parts in here have already been sold. The topics will be kept for a few months for reference. |
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#101
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This will help, some engine codes got reused in later years.
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#102
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Yes that was me 8 years ago and yes it was not an SD block like I was told and was sold as a standard block. Guess what! that is what this forum is for educating and selling Pontiac stuff. If you want to attack my integrity, go ahead but you should do that personally. and not hide behind a keyboard. I will always admit when I am proven wrong. I use Pontiac stuff not sell it, but when I aquire something I usually keep it or sell it as the need requires. Not that its any of your business but the guy who bought the 421 was super happy and so was i we keep in touch. As far as a pattern of scew ups, heck yeah i have had my share.
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#103
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Thanks for the info, geez i may have to pull the PHS document on this motor just for giggles. I know my name is mud here now but it would be nice to see an HO build was put in this motor, but I think that would be wishful thinking with little hope. Thanks for the time you spent looking it up.
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#104
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Your block is a 71 but you asked how the 70 GTO could have that code. Codes being used more than once is how.
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#105
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Gm definitely pulled parts as needed. I have a 69 YS auto gto block non ram air with 4 bolt mains. It's factory and as far as I know shouldn't be 4 bolt. My current 1969 gto has its numbers matching block YS as well, non ram air and its a 2 bolt.
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1969 GTO street strip project 11.1 forged 461, highport heads 1995 Trans-am 420 ci sb 14:1 compression 9"ford 9.89@132 1.34 60ft SOLD! |
#106
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Very interesting, there should be a thread for all of these applications that devated frm spec and the norm. To bad most of those folks who worked at the plants have probably passed by now. i am sure there are some cool stories they could share. Now info is merely written and interpreted. Some have open minds and some are set in there ways and dont want this information to be revealed.
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#107
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I have read through this thread .
I bought a 455 two bolt that was taped for 4 bolt mains too. I build like the motor you built . Roller with 4.5 stroke E heads ect. But a question I did not see asked is have you installed the 4 bolt caps on this block and checked to see if they are machined to the block noted. possibly they were just included with the block . |
#108
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Quote:
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#109
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Quote:
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#110
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109 Posts and NOBODY has mentioned what this engine was... a... >>>> RPO L75 <<<
A friend owned a 71 Formula 455 with this engine. There were 2 formula 455 engines in 71 and this was the 'D" port version, and WAS a 4 bolt capped block when I saw it get taken apart for the first time. Not an HO though, no round ports, etc. However just heads, and exhaust and you would be close to making one. This engine is from a GP most likely, but a good core for a fun build. About your caps. The bolts look correct. To cheaply see if they are correct, you would have to carefully clean the crank bore, install bearings , lube and a crank and plastigauge if it spins well. Other than that, you can send to machine shop, but now your eating into your profit. I have seen a couple big car 455 blocks from 1970 with 4 bolt caps as they were same block as the 70 D port "HO" GLWS...
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
#111
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They may not align . Edges off and or the hone lines won't match . But as with my block, was drilled and tapped but was a two bolt . My block was a YC also. See date code on block
Last edited by dld; 12-29-2021 at 06:24 PM. |
#112
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Block is sold
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