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Old 06-12-2019, 09:31 AM
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638 Block

Hello Guys.
I figure we might as well make this official, as I'm probably picking up a 1 piece RMS block this Monday. I will be sending to machine shop and getting proper work done to put a 383 Rotating Assembly into.
It is a 638 casting with provisions already for the Dog Bone and front cam holder in there. It has 4 bolt caps, but a little surface rust. I'm going to throw down $150 for it if it looks decent when I get there.
I have been scouting around here for awhile and there's not much to choose from for building a factory roller motor. Been seeing a few 400 blocks which would be ideal, but one has been punched .06 already, and the other needs machine work still and they want $500 for it. Not to mention the added cost of Retro Cam and Lifters. Also there's another that needs a sleeve, so I have decided just to go for a 383.
I am already putting together the 200cc intake runner heads right now, and am hoping to get this thing together rather quickly.

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Old 06-12-2019, 09:37 AM
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Pics for block I'm thinking of getting.
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Old 06-12-2019, 09:59 AM
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Nothing wrong with a 538 block.

Are you also getting the 1-piece rear man seal adapter with it, it's missing in the photos??
If you have to buy a new one that almost doubles your buy-in price on the block.

Make sure the shop is going to cleanup hone those lifter bores if you can see any rust in them.
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Old 06-12-2019, 11:13 AM
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Quote:
Originally Posted by ericnova72 View Post

Are you also getting the 1-piece rear man seal adapter with it, it's missing in the photos??
It's been about 2 years since I built my 880 Block which is also a 1 piece RMS. I don't remember anything special back there, although I have slept quite a bit since then and also had a few beers!

I will be ordering the one piece RMS rotating assembly from Skip White after we see how the block turns out. Will be something similar to this
https://skipwhiteperformance.com/cat...1pc-rms_90050/

Please try to get me a PN, because I'm only seeing the seal, and nothing else back there on my commercial Advance, NAPA, and Vato Zone accounts. I'm finding BS 40626 for Fel-Pro and JV554 for Molly. Does it have that big cover back there that holds the seal on the late model LS? I see a bunch of them every time I pull out an old burned up 4l60E I try to put a new rear main seal in it too...
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Old 06-12-2019, 11:35 AM
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This piece, bolts into that cavity behind the rear main cap on the block and holds that 1-piece rear main seal. Can't put the engine together without it. It is missing in your block pics.

Price has come down a bit, was over $100. 1-piece rear main seal retainer.

https://www.summitracing.com/parts/nal-14088556

They also make these as adapters, to put a 2-piece seal crank in a 1-piece seal block.
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Old Today, 09:25 AM
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Wow!

Talked with Chris Straub this morning, and told him everything he wanted to know. This is the camshaft he recommended to me and I'm going to go for it. It is a LOT BIGGER than I was planning on, but I am glad I spoke with him. Again from Excellent recommendations from You Guys on here.
https://straubtechnologies.com/sbc-p...-comp-camshaft

He also recommended 1.6 rockers with this combo.
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Old Today, 09:28 AM
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Here is a pic of the heads I'm building.
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