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Post by sc397 on Mar 20, 2017 4:42:02 GMT -8
Joe built his '70 390 to go play with the Pure Stock Racing boys. Man, the thing sounds healthy! I will post up a vid as soon as this comuter system will let me..
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Post by javtwotone on Mar 20, 2017 5:42:58 GMT -8
Gotta love the log manifolds.....
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Post by sc397 on Mar 20, 2017 5:45:58 GMT -8
Yea, not so much.
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Post by n2ojoe on Mar 20, 2017 9:47:52 GMT -8
Thanks for the use of the run stand and all the help Rick! I can't wait to get some dyno time with this combo.
Yea, the logs are a bummer but it has to have the right part #'s for the Pure Stocks. I'd post more pics of the progress, but Photobucket locks up my 'puter every time I open it...
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Post by n2ojoe on Mar 20, 2017 21:29:37 GMT -8
OK, I have a little more time now after work with a few beers to help me through my slow photobucket dilemma... I've been working on this "Pure Stock" 390 build over the winter to conform with the slight modifications the rules allow (see www.psmcdr.com for complete rules). The shortblock is a service block based 1970 390 with stock crank (.010" main, .020" rod journals, internally balanced). The block is .030" overbore with lifter valley oil line mod and ARP main studs. The stock rods have been reconditioned and match balanced with ARP bolts. The pistons are Wiseco Pro-Tru flat tops with 1/16", 1/16", 3/16" Total Seal ring package (gapless top rings, Napier second) and Teflon coated skirts. I used the Bulltear (built by Ishihara-Johnson) crank scraper kit, BHJ sfi approved steel harmonic damper, and American Powertrain steel 33lb flywheel. The timing chain is a custom length Cloyes double roller to keep timing tight. I had originally purchased a tried and true Comp 268H cam, but after many sleepless nights playing with the desktop dyno program I decided on the Comp 262 Extreme Energy grind for the more modern aggressive lobe design. The top end features the correct 291C heads, which have no porting or bowl blending per the rules. They have a good multi-angle valve job and have been machined for .531" positive stop valve stem seals. They have all new 2.02", 1.68" valves with Comp single valve springs and retainers/keepers, and have been milled .020" putting the compression ratio at 10.38:1 (the rules allow 11.7:1, but I decided to keep the engine somewhat pump gas friendly). The intake is the correct cast iron 4 barrel piece, with a big thanks to Stickshifter for help with milling the surfaces to fit correctly as well as a few "tweaks" I requested. The original Autolite 4300 carburetor (605 cfm) is in place. The valvetrain has chromoloy 1 piece pushrods, 1.6 ratio roller tip rockers (the stock rockers will be in place for the Pure Stock event though), and new 3/8" rocker studs with polylock adjusters. The stock distributor features a Petronix module firing an Accel coil. The correct log manifolds had to be used, but a full 2 1/2" exhaust was built with an X-pipe, Dynomax Ultraflo mufflers, and mandrel bent Mustang LX tailpipes. This will be going into my 1970 AMX with a T10 trans with McLeod ceramic/organic clutch. The driveshaft is a custom built 2.75" diameter. Rear gear ratio rules allow any changes, so I may install a 4.10 depending on the power range on the dyno. There still lies the trick of hooking up on the stock sized Polyglas rubber, but this should be a fun "stock" sleeper!
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Post by sc397 on Mar 21, 2017 3:38:20 GMT -8
Purdy!
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Post by 67roguexcode on Mar 21, 2017 4:56:24 GMT -8
Very nice!
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Post by javtwotone on Mar 21, 2017 6:09:00 GMT -8
Looks great, and sounds like a lot of fun. Really makes me miss my '70....
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Post by 69Rebel on Mar 21, 2017 19:16:26 GMT -8
That's a sweet car. I'm all kinds of eager to see how she does.
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Post by stickshifter on Mar 22, 2017 3:32:26 GMT -8
Looks great and good progress. I'm glad someone is making progress. LOL
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Post by n2ojoe on Mar 22, 2017 6:42:44 GMT -8
Thanks guys! I hear 'ya on progress Kevin, I wanted this project done and in the car by the end of December so I could start on the Mustang's list of upgrades. It may be another year of not much racing for me, but at least I can have some fun in the X. The AMC guys are more fun anyway, just really bad for my liver.
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Post by fast401 on Mar 22, 2017 9:27:41 GMT -8
Dang Joe! This looks like it's going to be shit ton of fun to me!
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Post by n2ojoe on Apr 27, 2017 13:17:33 GMT -8
Well, the dyno guy is pretty backed up with actual paying customers and still wasn't quite ready for me. I got anxious and decided to just put the engine in Sunday. I've been working on the tune a little with the fuel/air meter. The primaries on the 4300 are real close, but with the secondaries opened it's still a touch rich. It feels pretty good so far.
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Post by fast401 on Apr 28, 2017 11:41:24 GMT -8
I can hardly wait for the Dyno numbers. Sounds interesting!
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Post by n2ojoe on Apr 28, 2017 14:34:42 GMT -8
Yeah, me too. It may be later this year, I just ran out of time and need to get onto other projects right now.
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