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#181
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I have a new set of Howard 98445. could test a few and let you know pressures. Might be to strong though for what your after. There a 399 lb/in spring.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#182
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I thought this was a rather strange find. While cleaning and preparing the FACTORY head bolts for re-installation, I found this! See the pic. The outer 3 bolts on each head, only the long ones are copper plated. So on each side there are 7 typical head bolts and 3 that are plated. This includes a couple stud bolts, one which has the negative battery cable attached to it. Has anyone ever seen this on any Pontiac engine? I have not that I recall. Is this an SD-455 thing? Kind of interesting at least. I am very confident these are the OE head bolts. All 20 have the same head markings. What do you think?
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#183
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Definitely for the SD 455. Not sure if the RA V's had them though.
The lengths are different than the standard heads.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#184
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All round port engine used the copper colored head bolts. They are belong in the exhaust port bolt holes. I'm thinking the copper color was to alert a person they need to go in a specific place. Sadly it's not uncommon to find round port blocks with heli-,coils in holes where those bolts belong. You will pull the threads out if you use the shorter standard bolts. The copper bolts are 4". One studded bolt goes on the LH front for the battery ground. The other one goes in the RH center for the A/C support bracket.
Not sure what the factory recommended for the RA V engines but the the 4" long copper colored bolts will work. |
#185
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#186
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Very interesting to see!
I'm skeptical they'd pay to plate and hydrogen-relieve just for ID. The bolts are longer, not easy to confuse.... ??? Any chance the copper is to reduce galling? Like anti-seize? Do these bolts have higher risk than others by being close to exhaust? |
#187
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I thought it was mainly for the heat. Also possibly to keep the 'rust' from getting bad on them.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#188
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#189
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I have nos bolts. Yes they are copper colored. The other bolts of mine have greenish color.
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#190
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Thanks for verifying. Heads to be installed tomorrow.
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#191
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If that’s a flash copper plating I can’t think of any reason for them to only be used in 3 out of the 6 bolt holes that pass near exh ports.
Now the studded one can be seen to be used possibly for producing a better ground connection on the studded end and then also by the threads in the block. Conversely the copper if originally was on all the bolts might have been used in place of any lube . At this point in time we may never know the true intentions for this interesting detail.
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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! |
#192
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If Herb Adams comes to Dayton again for the TA Nationals, I will try to remember to ask him. I just bet he knows exactly what the intention was and why they are in there. Can't think of anyone else off hand. Although I like the idea of the copper plating improving the ground location for the negative battery cable. What about the 700,000 other Pontiac V-8's that didn't get that stud bolt that year? They still needed a good ground. Just another interesting little Pontiac tidbit.
Last edited by mgarblik; 04-21-2024 at 09:42 AM. |
The Following User Says Thank You to mgarblik For This Useful Post: | ||
#193
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When I dug out my bolts there were a couple of washers still on them. Measured .060 thick. Dont know why they used them but was talked about on this site some time ago. There was GM part number for them. Sourced .100 thick hardened washers and used them on the reassembly.
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#194
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#195
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If the concern at factory was that the bolts would first bottom out in the holes before reaching the needed torque spec, then with the added costs of the SD motor you would think that parallel ground washers of the right ID would have been used.
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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! |
#196
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I finally have a little update on this project. It has been dragging along some these past 2 months. I did get side tracked with the dry ice blasting of the underside of the car. The last month, I have had allot of help getting the SD engine ready for a proper paint job. This has been quite a project. As many know, the paint color is specific and not really reproduced properly. The spray cans from Ames are pretty far off the original color. I ended up utilizing an OE SD valve cover from a very low mileage SD engine. Had it matched using a spectrometer and House of Color pigments. They did a great job. Then my friend spent allot of time stripping and prepping the entire engine for paint. Removing every bit of rust from the sheet metal and the porous iron block and heads. Today, it is finally ready for paint which should be happening later. Here are some pics of an SD-455 in the raw.
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The Following User Says Thank You to mgarblik For This Useful Post: | ||
#197
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Here is a pic of the paint match to a very low mileage SD-455 valve cover with OE paint.
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The Following User Says Thank You to mgarblik For This Useful Post: | ||
#198
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The spray can that was suppose to be a match is much lighter in color.
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#199
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Engine is painted! Had perfect weather for July in Ohio. Low humidity and a high of 76 degrees. Here are some pics along with a match to a 30,000 mile original paint SD valve cover.
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The Following 2 Users Say Thank You to mgarblik For This Useful Post: | ||
#200
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Very nice Mike! I can feel the excitement.
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