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Old 03-26-2011, 06:54 PM
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327 chevy rods, large or small journal?

I have aquired a set of 327 domed pistons and rods, however I have no idea of the brand so look up on these is a challenge. How can I tell if the rods are small or large journal? The block I'm using is a large journal 010 block (3970010). If these rods turn out to be small journal can I still use them on this block?


Edit: There is a stamp on the head of the piston: L2210A 030 not sure if this helps, the rods have nothing except their Id #'s in ref to 1-8

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Old 03-26-2011, 07:16 PM
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Measure the ID of the big end. A SJ rod will be 2.125", LJ is 2.225".

Piston is for a SBC 302:
Dome height .519"
12.5:1 CR w/64cc chamber
Dome volume 19.30cc
Comp height 2.235"
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Old 03-26-2011, 07:23 PM
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Also, small journal rods have 11/32" diameter bolts, large journal rods have 3/8" diameter bolts.
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Old 03-26-2011, 07:25 PM
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Bad66,

What I found is that there are three sizes for the large end. 2.225, 2.125, 2.015(chevy rod with Honda size for NHRA) Measure and you will know what you have.
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Old 03-26-2011, 07:39 PM
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Thanks for the info, and especially the specs on the piston itself. 12.5:1 is going to be a little high for me. About what cr do you think I could get with a set of 76cc heads? Also when measuring are you talking from end to end or just the opening? Thanks again
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Old 03-26-2011, 07:42 PM
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If it is a solid piston dome it can be machined shorter in a mill or lathe, to adjust compression ratio to your needs.

76cc open chamber head and a dome piston is the absolute worst combination as far as burn characteristics. It's something to be avoided.
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Old 03-26-2011, 07:49 PM
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Quote:
Originally Posted by ericnova72
If it is a solid piston dome it can be machined shorter in a mill or lathe, to adjust compression ratio to your needs.

76cc open chamber head and a dome piston is the absolute worst combination as far as burn characteristics. It's something to be avoided.
Yeah I assumed so, thanks for the heads up. This is my first 327 build and I'm finding it to be alot more complicated than the usual 350 or 383. These pistons may no be right for what I'm looking for. I'll talk to my shop about milling them down and hope it's not too expensive, otherwise I may sell these and go with a flat-top or smaller dome.
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Old 03-26-2011, 07:56 PM
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Quote:
Originally Posted by Bad66
Thanks for the info, and especially the specs on the piston itself. 12.5:1 is going to be a little high for me. About what cr do you think I could get with a set of 76cc heads? Also when measuring are you talking from end to end or just the opening? Thanks again
The opening of the big end will determine whether it's a LJ or SJ rod. These are factory rods? Some (very few) OEM LJ rods came from the factory with 11/32" bolts- right in the time frame when 302 engines were being produced (1968-ish).

You do realize that these pistons are for use w/a 3" stroke crankshaft, right? A 327 SBC uses a 3-1/4" crank.
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Old 03-26-2011, 08:03 PM
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Quote:
Originally Posted by cobalt327
The opening of the big end will determine whether it's a LJ or SJ rod. These are factory rods? Some (very few) OEM LJ rods came from the factory with 11/32" bolts- right in the time frame when 302 engines were being produced (1968-ish).

You do realize that these pistons are for use w/a 3" stroke crankshaft, right? A 327 SBC uses a 3-1/4" crank.
No I did not, that complicates things more. These were given to me and I was told they were for a 327. I assume a 3" stroke is a 302 right? Thankfully I have not done ANYTHING or even bought anything as of yet. I'm gald I did some homework and asked some questions before I sent the block in. This may just be a 350 build after all.....

On a side note, any of you pro's have an idea of what these things might go for if I wanted to sell em'?
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Old 03-26-2011, 08:17 PM
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Quote:
Originally Posted by Bad66
These were given to me and I was told they were for a 327. I assume a 3" stroke is a 302 right?
A 302 uses a 3" stroke, correct. You can double check the piston ID info, I'm "remembering" from hand written notes that are many years old.
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Old 03-26-2011, 09:10 PM
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Original 302 Chevy pistons had a hollow dome, it was not solid so it cannot be machined down. The pistons may be worth something to somebody, but they will need a 302 crank and they are as rare as hens teeth and expensive.

Vince
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Old 03-26-2011, 09:40 PM
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Quote:
Originally Posted by Bad66
On a side note, any of you pro's have an idea of what these things might go for if I wanted to sell em'?
If they're SJ rods, they could be used to build a "301" SBC- a 283 bored out to 4".

It seems that at least once a month someone comes here wanting to build a 301/302 SBC. You can put them in the Classifieds here on this board by clicking on it at the top of the page to get started, or put them on ebay or racingjunk, etc.
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