Cheap 283 mods/hop-ups - Chevelle Tech
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post #1 of 20 (permalink) Old Oct 9th, 08, 9:43 PM Thread Starter
Tommy
 
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Cheap 283 mods/hop-ups

1965 malibu, 283", turbo 350 trans with 10" convertor, 3.73 gears, 26" tall rear tires, holley dual plane, 600cfm carb. 1 5/8 headers

I'm looking for some cheap 283 speed tricks.

Can I install 1.6 ratio rockers and gain?

Carb spacer?

valve lash?

Larger cam (not wanting to change springs at this time)?
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post #2 of 20 (permalink) Old Oct 9th, 08, 9:46 PM
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Re: Cheap 283 mods/hop-ups

figure out what heads you have. Maybe try and increase compression ration. then add some cam to it. or cam at least

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post #3 of 20 (permalink) Old Oct 9th, 08, 9:47 PM Thread Starter
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Re: Cheap 283 mods/hop-ups

Stone stock 1965 283 heads.

What was the head gasket thickness factory?
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post #4 of 20 (permalink) Old Oct 9th, 08, 10:15 PM
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Re: Cheap 283 mods/hop-ups

If your cam is still stock, that's where you'll find the most hp per $. Something around 220º @ .050 would give a noticeable mid/upper rpm increase without killing too much low rpm power. Next up would be heads (or heads AND a 350 shortblock . The items you mentioned would probably get you a couple horses each with a stock cam.
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post #5 of 20 (permalink) Old Oct 9th, 08, 10:32 PM
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Paul
 
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Re: Cheap 283 mods/hop-ups

I try and find some vortec heads or a better 1.94 intake valve head then a cam with about 220* @.05

Personally I like 283's there out of the ordinary and with a cam they sound awesome too

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post #6 of 20 (permalink) Old Oct 9th, 08, 11:49 PM
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Paul
 
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Smile Re: Cheap 283 mods/hop-ups

I'mmm herrrre!!

Sure, get her up to 10 to 1 using worked over and planed to 50 cc chambered 305HO, -601 heads, Fel-pro's #1094 .015" thick shim headgaskets, stock flat-top pistons and install this solid lifter cam from PAW that I figure is this Elgin cam.....

E-1133-P; 280/246, 108/106, .498, Lash, .030 and .030

in it from PAW for like less than $50 when I bought mine and have more fun than the Law will allow!

PAW calls it their 264/246 cam so go figure IF they are still selling it and I have one in my bedroom closet for my next junk292/301 engine that I am gathering parts for!

You will be looking at 385 hp at 6500 rpm and 350 t at 5,000 rpm per D2k?

pdq67

PS., you put 64 cc Vortec heads on her and your CR will be about 8 to 1 unless you install stock 1/8" tall, 1/2 round, domed pistons.

I know all about this stuff b/c of my old junk301 from years gone by!

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post #7 of 20 (permalink) Old Oct 10th, 08, 1:07 AM
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Re: Cheap 283 mods/hop-ups

Tommy,

Your engine is SCREAMING for better heads and cam. However, you will not get much of a car if you want to run stock springs

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post #8 of 20 (permalink) Old Oct 10th, 08, 1:29 AM
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Smile Re: Cheap 283 mods/hop-ups

That's really not so b/c all Chevy did when they installed the old 30-30 cam was QC'd their stock springs and installed them.

I do suggest installing at least a cheap set of Z-28, (-142), valve springs tho! Heck, what are they?? $25 to 35/set?

Check Midwest Motorsports Elgin Z-28 type springs and retainer kit.

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Last edited by pdq67; Oct 10th, 08 at 11:45 AM.
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post #9 of 20 (permalink) Old Oct 10th, 08, 1:30 PM
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Re: Cheap 283 mods/hop-ups

my 67 283 has stock heads (1.94 1.5 valves if i remember correctly), hooker hk32(i think thats the part number) 1 5/8 headers, hei distributor, weiand al intake with edelbrock 600cfm carb with manual secondaries, supposedly has a 485 lift cam already installed, dont know much more about it than that, and electric fan, all sitting in front of a muncie. hopefully i at least have 283 hp at the flywheel. it came with 195 hp stock

edit- pdq what should 283s like these be shifted at? i see your hp quote is at 6500 rpm, but i was figuring on shifting at 6k

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post #10 of 20 (permalink) Old Oct 10th, 08, 2:18 PM
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Re: Cheap 283 mods/hop-ups

Spray it!

66 Malibu Coupe, home rebuilt 350. Took me 39 years to get her!
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post #11 of 20 (permalink) Old Oct 10th, 08, 2:37 PM
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Re: Cheap 283 mods/hop-ups

question , how much valve lift can yu use with 1.94 valves and the small bore ? im sure the valve will interfere with the bore at some point ?
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post #12 of 20 (permalink) Old Oct 10th, 08, 3:31 PM
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Re: Cheap 283 mods/hop-ups

1.94" valves will not interfere with a 3.875" 283 bore no matter what lift... a 2.02" intake valve will though.

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post #13 of 20 (permalink) Old Oct 10th, 08, 3:32 PM
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Re: Cheap 283 mods/hop-ups

Quote:
Originally Posted by BillsCamino View Post
1.94" valves will not interfere with a 3.875" 283 bore no matter what lift... a 2.02" intake valve will though.
gotcha thats what i was wondering .
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post #14 of 20 (permalink) Old Oct 10th, 08, 5:07 PM
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Re: Cheap 283 mods/hop-ups

Quote:
Originally Posted by BillsCamino View Post
1.94" valves will not interfere with a 3.875" 283 bore no matter what lift... a 2.02" intake valve will though.
I have a customer that has ran a set of my not-quite-stock vortecs, cut out to 2.02-1.6's sitting at 52CC's on a little .060 over 283. It's his back up motor to his 350 powered circle track car. He has won races with that little motor and while it is lacking a little torque coming out of the corners to the 350, it rips down the straights.

So, I know a over bored 283 will accept a 2.02 valve. Std bore, I don't know.

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post #15 of 20 (permalink) Old Oct 10th, 08, 10:12 PM
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Smile Re: Cheap 283 mods/hop-ups

Only one or MAYBE two of 283 engines came out w/ the -461x heads w/ 1.94"/1.50" valves and it was in the early '60's so all the others ran heads like the power pack w/ 1.72"/1.50" valves.

Or smaller intake port jobbers than them.

You can run 2.02"/1.60" valve double-hump heads on a 283 IF you use a lift limited cam that's from .450" and shorter! But you'd better run domed pistons and shim headgaskets b/c your CR will be down around 8.2 or so w/ flat-tops!

The 283 I finally got that was my Nephew's had a good set of big valve 291 heads on it, flat-tops and a TRW 308/246, .433" lift hi-cam in it! I figure the reason he got the old junk car w/ it in it was b/c it wouldn't pull me off my Throne, it was so low CR'd!!

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