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Old 03-10-2010, 08:19 AM
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283 Rebuild

I have a 1963 283 that came out of a Chevy C10. I'm planning on boring it .030 over and was wondering if anyone knew if I was to put a 327 SJ crank in it(to make a 311), 3.25'' stroke 2.3/2.0 journals, would it clear the block without grinding? I don't have the crank yet, found one for $100, I want to know before I blow my money on something that will end up as a paperweight if it won't work.

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Old 03-10-2010, 08:24 AM
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Edit, comment withdrawn. I was thinking of a 302.
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Old 03-10-2010, 12:31 PM
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Quote:
Originally Posted by HotRodRookie
I have a 1963 283 that came out of a Chevy C10. I'm planning on boring it .030 over and was wondering if anyone knew if I was to put a 327 SJ crank in it(to make a 311), 3.25'' stroke 2.3/2.0 journals, would it clear the block without grinding? I don't have the crank yet, found one for $100, I want to know before I blow my money on something that will end up as a paperweight if it won't work.
The crank will fit into the block ok, but the problem will be finding pistons in a 3.905" bore size with a 1.675" compression height. I suspect the cost of custom pistons will far outweigh the advantage of the additional cubic inches.
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Old 03-10-2010, 12:43 PM
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Quote:
Originally Posted by techinspector1
The crank will fit into the block ok, but the problem will be finding pistons in a 3.905" bore size with a 1.675" compression height. I suspect the cost of custom pistons will far outweigh the advantage of the additional cubic inches.
Would you suggest leaving the stock crank? This is my first rebuild so I want to learn and I want to be able to improve HP and torque, being a 283 can I improve much of this with just Top End improvements?

Planning on putting into a Nova or other small body chevy.
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Old 03-10-2010, 12:54 PM
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All you'd be doing is building a .030 over 307. I would have to imagine there are still +.030 pistons available for that engine. Right?
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Old 03-10-2010, 01:25 PM
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Quote:
Originally Posted by techinspector1
The crank will fit into the block ok, but the problem will be finding pistons in a 3.905" bore size with a 1.675" compression height. I suspect the cost of custom pistons will far outweigh the advantage of the additional cubic inches.
He will just need .030" 307 pistons to accomplish this. Available in cast, hyper or even high end forged if needed.
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Old 03-10-2010, 01:39 PM
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Yeah, you guys are correct. That's what happens when I answer without having my usual 1/2 pot of coffee.

I suspect though, that the only thing you'll find off the shelf is cast rebuilder type pistons. Now, there's not anything necessarily wrong with such a piston in a street motor, but these pistons are manufactured with a shorter compression height (1.655") than stock (1.675"). Figuring a 9.025" block deck height, this puts the crown of the piston 0.045" down in the bore at TDC. Now, when you add a head gasket, even a shim gasket at 0.015", you have a 0.060" squish. And a shim gasket isn't going to work too well if the block decks and heads aren't dead flat and smooth.

Anyway, I looked at a few different pistons and most of them have recessed crowns. Here is the only flat-top I found....
http://www.summitracing.com/parts/STL-295P/?rtype=10

Last edited by techinspector1; 03-10-2010 at 02:27 PM.
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Old 03-10-2010, 02:13 PM
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Years and years ago (early 70's) I built a couple of 292" sbc (.060 283) one was for a guy that had a Vega and not a lot of money (who did?) Old Edelbrock C4B int. with an 1850 600 Holley, Isky Mega cam, 270 'ish dur. and a set of home semi ported heads. It was a 4 spd. and SLUG down low but hit 4,000 rpm and it would scream. He had no money to balance it but we did use SPS rod bolts, other than that it was a stock bottom end. A lot of fun for cheap.
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Old 03-10-2010, 03:27 PM
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Just dinkin' around....BUDGET BUILD STREETER
283 bored 0.030"
327 SJ crank
Sealed Power cast flat-top pistons, 1.655" C.H.
http://www.summitracing.com/parts/STL-295P/?rtype=10
'80-'86 305 heads, casting 14014416, 58cc, 1.84"/1.50" I'd use these over the 283 heads if only for the fact that they have threaded accessory holes and hard valve seats.
With the 7cc pistons, 58cc heads, 3cc shim gaskets and 9cc's in the deck, we have a decent little 9.3:1 street motor.
'78-'85 305/350 aluminum 4-bbl intake manifold for Q-Jet, casting number 14057053. Could also use '76-'82, casting number 458520.
Q-Jet carb.
1 5/8" long tube headers
CompCams XE262H flat tappet hydraulic cam
http://www.compcams.com/Cam_Specs/Ca...x?csid=85&sb=0

RPM HP TQ
2000 130 342
2500 164 346
3000 198 347
3500 240 361
4000 267 351
4500 280 325
5000 270 283
5500 243 232

Peak volumetric efficiency 86.5% @ 4000
Peak BMEP 174.7 @ 3500
Motor should work hard all day on crummy pump gas.
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Old 03-10-2010, 04:30 PM
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Quote:
Originally Posted by techinspector1
Just dinkin' around....BUDGET BUILD STREETER
283 bored 0.030"
327 SJ crank
Sealed Power cast flat-top pistons, 1.655" C.H.
http://www.summitracing.com/parts/STL-295P/?rtype=10
'80-'86 305 heads, casting 14014416, 58cc, 1.84"/1.50" I'd use these over the 283 heads if only for the fact that they have threaded accessory holes and hard valve seats.
With the 7cc pistons, 58cc heads, 3cc shim gaskets and 9cc's in the deck, we have a decent little 9.3:1 street motor.
'78-'85 305/350 aluminum 4-bbl intake manifold for Q-Jet, casting number 14057053. Could also use '76-'82, casting number 458520.
Q-Jet carb.
1 5/8" long tube headers
CompCams XE262H flat tappet hydraulic cam
http://www.compcams.com/Cam_Specs/Ca...x?csid=85&sb=0

RPM HP TQ
2000 130 342
2500 164 346
3000 198 347
3500 240 361
4000 267 351
4500 280 325
5000 270 283
5500 243 232

Peak volumetric efficiency 86.5% @ 4000
Peak BMEP 174.7 @ 3500
Motor should work hard all day on crummy pump gas.
Not to butt in on this virtual build but I'm curious: Do you think there'd be any worthwhile gains with the 059 305 vortec heads and a performer vortec intake on this setup?
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Old 03-10-2010, 04:42 PM
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I don't know. Don't have the flow figures on the 059 heads. Used these figures for the 416 heads on the Sim....
0.100 63 37
0.200 116 78
0.300 157 101
0.400 182 107
0.500 195 110
You might pick up a few hp with the Performer manifold over the stocker. I was just puttin' together a down and dirty (read cheap) junkyard build.
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Old 03-10-2010, 04:52 PM
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Quote:
Originally Posted by techinspector1
I don't know. Don't have the flow figures on the 059 heads. Used these figures for the 416 heads on the Sim....
0.100 63 37
0.200 116 78
0.300 157 101
0.400 182 107
0.500 195 110
You might pick up a few hp with the Performer manifold over the stocker. I was just puttin' together a down and dirty (read cheap) junkyard build.
Yeah, I figured. I had a hard time finding flow figures for them myself. The reason I ask is that this 305 vortec in my 96's days are numbered. I figured if it would make a nice strong 307 build I'd keep them around, otherwise I'm just giving them to my dad to go under the hood of one of his c70s.

EDIT- of course NOW I find the numbers...

0.100 68 47
0.200 128 103
0.300 179 138
0.400 205 152
0.500 221 163

(according to the Stan Weiss flow data chart)

Last edited by Valkyrie5.7; 03-10-2010 at 05:00 PM.
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Old 03-10-2010, 09:07 PM
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Okay, punching in a similar (same cam, etc) build to Techinspector1 but substituting the flow figures that I listed for the 059 vortecs these are the hypothetical numbers I ended up with. Just for those who were as curious as I:

RPM HP TQ
2000 135 355
2500 168 353
3000 208 363
3500 250 375
4000 291 382
4500 311 362
5000 298 313

Max VE 89.5% @ 4k.

Just thought these numbers turned out interesting for a 307.
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Old 03-10-2010, 09:13 PM
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Nice little street motor. Thanks for runnin' that.
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Old 03-10-2010, 09:16 PM
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Quote:
Originally Posted by techinspector1
Nice little street motor. Thanks for runnin' that.
Thanks for the inspiration. I might have to hold on to these 059's after all.
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