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Old 11-18-2002, 05:41 PM
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Post chevy 302 help

I want to build a chevy 302 I know I have to have a 67 or older 327 Because it has small journals and a 283 crank. I want to know what rods to use 283 or 327. Pistons if they are special since you are destroking a 327. and what heads would work best thanks.

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Old 11-18-2002, 05:49 PM
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use the 327 rods, if you look at them you will see that they resemble the 350 rod only smaller, the 283 rod looks more like the six cylinder rod, and doesn't have the extra meat on the sides at the parting line, in the old days when new ones were available you looked for the green paint mark on them. 302 pistons are still available but most are for 11-1 compression designed after the old trw forgings, the late 76 cc heads would knok it down a bit.
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Old 11-19-2002, 07:27 PM
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thanks for the help
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Old 11-20-2002, 08:33 AM
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Another option is to use a large journal 3" stroke crank. There were large journal 302's made in 69!!!!

From what I have read the original 302 piston is pretty hard to locate these days. I have seen this combo mentioned:

Use the PM 5.94" rod used in the 264 V8 ( the 4.3L LT-1 used in base Caprice's 94-96) and 327 pistons will bring the pistons only 0.01 in the hole!! Then you have choices in compression ratio's and can use easy to find parts. You could use a late model one piece seal 350 block, and use the factory 3" stroke crank and rods from a 264, possibly even could find in a junkyard used.

Something to think about
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Old 11-20-2002, 10:15 AM
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Not being a smart *** , But what 264 did Chey build? Where was i ? I know only of the 262,265 and 267. Please advise me, if this is a motor i do not know of, i would like to know more about it. Thanks in advance.
Slider in Wa.
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Old 11-20-2002, 01:02 PM
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Wink

Really this motor does exist.

The base motor for the Caprice from 94-96 was a 263.66 CID Gen II small block. Would look externally like a LT-1. This motor used 305 sized pistons, a unique 5.94" rod and a 3" stroke, was like 195 HP SAE net. My brother has a 94 9C1 caprice and you need to watch out for the 4.3 models as they look like the LT-1 but don't have dual exhaust.

Here is some info I dug up.
Production Chevy Small Block V8s

CID Years Bore Stroke Main Rod Actual Liters Main
bearing Bearing CID Bearing
265 55-56 3.750 3.00 2.30 2.00 265.1 4.34 2 bolt
283 57-67 3.875 3.00 2.30 2.00 283.0 4.64 2 bolt
327 62-67 4.000 3.25 2.30 2.00 326.7 5.35 2 bolt
302 67 4.000 3.00 2.30 2.00 301.6 4.94 2 bolt
350 67-94 4.000 3.48 2.45 2.10 349.8 5.73 2&4 bolt
302 68-69 4.000 3.00 2.45 2.10 301.6 4.94 4 bolt
327 68-69 4.000 3.25 2.45 2.10 326.7 5.35 2 bolt
307 68-73 3.875 3.25 2.45 2.10 306.6 5.02 2 bolt
400 70-72 4.125 3.75 2.65 2.10 400.9 6.57 4 bolt
400 73-80 4.125 3.75 2.65 2.10 400.9 6.57 2 bolt
262 75-76 3.671 3.10 2.45 2.10 262.5 4.30 2 bolt
305 76-94 3.736 3.48 2.45 2.10 305.2 5.00 2 bolt
267 79-81 3.500 3.48 2.45 2.10 267.9 4.39 2 bolt
All 1st generation small blocks used a 5.7 rod length except for the
400 cid engine which used a 5.565" rod length.
Firing order 1-8-4-3-6-5-7-2

Generation II and later
350 LT5-89 3.900 3.66 2.76 2.10 349.8 5.73
350 LT1-92 4.000 3.48 2.45 2.10 349.8 5.73
265 L99-94 3.740 3.00 2.45 2.10 263.7 4.32
350 LS1-97 3.900 3.62 2.558 2.10 346.0 5.67
293 LR4-99 3.780 3.27 293.6 4.81
364 LQ4-99 4.000 3.62 363.9 5.96
325 LM7-99 3.780 3.62 325.0 5.33

L99 is Gen. II 94 and later 4.3 liter
LT5 used from 89-95 in ZR1 Corvette
LT1 is Gen. II engine
LS1 is Gen. III engine 97 and later
LR4 99 and later 4.8 liter Vortec
LQ4 99 and later 6.0 liter Vortec
LM7 99 and later 5.3 liter Vortec


Here is the part info for the Rods I was talking about <a href="http://www.sdpc2000.com/cart.asp?action=prod_detail&catid=398&pid=479" target="_blank">http://www.sdpc2000.com/cart.asp?action=prod_detail&catid=398&pid=479</A>

[ November 20, 2002: Message edited by: 74LagunaS3 ]</p>
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Old 11-20-2002, 03:32 PM
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Man i like it when i learn new stuff!!!! I never heard of this engine before. Thank you for all the info as well.Cool.
Slider in Wa.
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Old 09-06-2003, 11:04 PM
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I also would like to build a 302 Chevy. I have a 350 block. Would it be easier to start out with a 327 block since it already has the small journals or would it be easier to custom make a crank? Also if it would be easier to use the 327 block is there any place that I can get one. The local junkyard doesn't have anything at the moment. I will keep checking with him though.
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Old 09-07-2003, 01:59 AM
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Note that the L99 5.94" rod is a large-journal item. Spacer bearings are available to use them on a small-journal crank. If you had an L-99 crank(3" stroke, one-piece seal) & rods and a one-piece-seal 350 block, you could make a 302 using 350 pistons. If it was a factory roller-cam block....
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Old 09-07-2003, 06:00 AM
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Arrow

I didn't know they made spacers for the rods, I know they make the spacers to put the small crank in the later block but didn't know they made spcers to run the big rods on the small crank too.
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Old 09-07-2003, 08:07 AM
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The small crank to large rod spacers were/are available through TRW. I used to have their part #.
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Old 09-07-2003, 01:44 PM
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67 302's all had small journal cranks with 2 bolt main bearing caps. 68 & 69 302's had large journal cranks in 2 and 4 bolt main caps. The 302 forged crank is a prized posession and is extremely expensive if you happen upon one.

Viince
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Old 09-07-2003, 01:59 PM
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Does anybody know where to get the spacers for the crank and rods? I have a 283 crank. I just need to get my hands on a 327 block and bore it out and use 350 pistons.
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Old 09-07-2003, 06:14 PM
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Quote:
Originally posted by rctruck96
Does anybody know where to get the spacers for the crank and rods? I have a 283 crank. I just need to get my hands on a 327 block and bore it out and use 350 pistons.
You are a little confused. A 327 block is already 4" bore, same as a 350. The 302 piston is 4" bore, but the wristpin location is set up for a 3" stroke crankshaft ala 283, or an original 302 crank.

283 3" stroke 3-7/8" bore
302 3" stroke 4" bore
327 3.25" stroke 4" bore
350 3.48" stroke 4" bore

Vince
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Old 09-09-2003, 01:25 AM
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http://www.raceeng.com/Pages/Page_17.html Probably should call for availability & pricing (last I heard they were quite expensive). A 350 block, which is the same thing as a large-journal 327 block, could be used with a 283 crank, 5.94" rods, & 350 pistons with spacer bearings at the rods & mains. A small-journal 327 block would not require main bearing spacers.
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