performance 262, 267, 283, 302, 305, 307: Combined threads - Page 5 - Chevy Nova Forum
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Old 26th-March-2006, 10:10 PM   #61
fixing-gpas ride

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boy i feel stupid my fingers got a lil carried away while typin. after rereadin his info its supposed to be 1.115 to 1.117 max per cube. sry for the confusion. i jus gotta slow down while typing.
after readin the posts i thought that seemed a lil overborard myself so i rechecked the info. sry guys have one on me
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Old 13th-September-2006, 06:31 PM   #62
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performance 262, 267, 283, 305, 307: Combined threads

I have a original 283 with 57,000 miles on it. This is a 195 horse 9.5 compression motor with a 2 barrel carb. I have been thinking about putting on my set of 462 casting 194 heads and a 67 four barrel intake on it until I can properly rebuild a 327. Will this make the performance worse or should I put the original heads back on until I can afford to finish the other motor? Any opinions would be appreciated.
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Old 13th-September-2006, 07:10 PM   #63
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At best you will be going from 58cc combustion chambers to 64 cc, and maybe much larger chambers. This will reduce you compression ratio and turn the 283 into a real pig. Been there, Done that. Those powerpak heads are really not that bad for a 283, if they are in good shape. The factory had a couple of combinations using old technology that produced one HP per ci. I'd go with an aluminum intake with a 600 cfm carb, small tube headers, something like a Comp XE 262 cam. maybe even smaller on the cam. It should run very nicely. If you really want to change the heads there are some Edelbrocks made for the 305 that should work.
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Old 13th-September-2006, 07:39 PM   #64
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I've used 305 heads with the 1.94 / 1.5 valves with the 58cc combustion chamber on the 283 engine & they work great. There is also a 1.82/1.5 valve 58 cc head that works good as well. Early-mid 80's 305 with the 4 bbl carb engines used these heads.
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Old 13th-September-2006, 09:20 PM   #65
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Your 283 will be a "pooch" with 64 cc heads. If your 283 has the 896 casting heads on it, keep 'em. They flow better than the 305 heads and have more potential. A lot of 305 guys have embraced the old 896 Power Pack heads. I would remove the heads and do some inexpensive rework to them and bolt-on a nice dual-plane 4-bbl intake. Dan has the right idea with the cam. You'll notice a difference.

Last edited by 64PRONOVA; 13th-September-2006 at 09:25 PM.
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Old 13th-September-2006, 09:44 PM   #66
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Camquest had the XE262 as 12th choice;
279.7Hp @ 5,000
328.8 lb/ft @ 3,500

In the Extreme Energy line it preferred the XE256H for your 9.5 283 with stock heads and a dual plane intake with a 600 carb..

273 Hp @ 5,000
331 lb/ft @ 3,000
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Old 13th-September-2006, 11:43 PM   #67
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Hi,

Interesting thread. I agree the 283 needs a pretty small chamber head.

Just out of curiosity, what is better about the 896 head, than the 305?

Why are they using those on 305s? I use a lot of the 305 heads, but I have a lot of the 896s and 520s still around. I was always under the impression that the 520s flowed better than the 896s.

Just curious
Thanks
Jeff
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Old 14th-September-2006, 12:04 AM   #68
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it's been years and years, my number's prolly off a bit... i had a 283 i slapped on a set of 997 (?) heads (57 Vett w/FI or 2x4's) and it screamed... had an old TRW perf parts cam in it
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Old 14th-September-2006, 12:24 AM   #69
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A fellow I know has the 64cc Edelbrock RPM heads on a 283. I've always heard you couldn't run these due to the small bore size. The engine was built by a top engine builder in my area.
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Old 14th-September-2006, 08:42 AM   #70
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Hi,


I don't think its so much a matter of valve size as it is compression ratio. The 64cc heads would probably be kinda marginal if it still has a flat top piston.

Sometimes volume of the heads can become a bit of an issue. I have cced a lot of the 283 heads and don't ever remember finding one that was actually the listed "spec". It usually takes about a .060" angle mill to get them in spec..

Years ago I used to build quite a few .060" over 283s with large valve (2.02-1.60), but these had large dome pistons.

I think the original 1.94 valve first appeared in a 283 in 61. I don't remember for sure but I think a few were built with aluminum heads, but later were recalled and replaced with iron heads.

On the nova 283 stick cars (65-67) I have put 327 cranks and 307 flat top pistons with a double hump head (usually a 1.94). This is about 317 inches and makes a pretty nice street engine.

On the Edelbrocks, I guess you would have know all the details and even then, if the customer is happy I guess all is well.


Sorry to ramble
Jeff
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Old 14th-September-2006, 09:22 AM   #71
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A 283 block with a 327 crank is a 307

Scrappy little motor, that one is.

Kev
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Old 14th-September-2006, 11:56 AM   #72
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Hi,

Your are right Kev.. I forgot to add that I usually take these .060" over.
I have taken a few .125" over with out any problems (knock on wood). As a matter of fact the motor in my 67 now is a ChevII 283 block bored to 4.000" with a set of std bore L79 style pistons. I really beat this bad back in the early eighties.

Good Luck

Jeff
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Old 14th-September-2006, 01:50 PM   #73
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I'v got a 283 in my 66 that has the 305 heads, punched 40 over with a single plane intake and a 350 horse 327 cam in it, and it suprised the hell out of my buddies 350 chevelle.
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Old 14th-September-2006, 07:18 PM   #74
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Thanks for the input everyone. I feel a lot more confident about making my next few decisions. I'II be going with the stock heads a mild cam, and 4 barrel intake and carb. I had taken off the timing cover today to see if it had the original nylon timing gears. Well it did but all three bolts on the cam gear were so loose I could take them off with my fingers. Now is that not good timing or what.
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Last edited by Kens 67; 15th-September-2006 at 01:34 PM. Reason: typo
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Old 14th-September-2006, 08:18 PM   #75
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I have a 283 30 over with vortec 64CC heads, and the XE256 cam. It runs great on the top end, but is a dog down low, even with a stall converter. If you want to run the XE256, you want the 58CC heads. Mine idles like crap, and does not kick in until about 3k, after that it moves rather well. I am actually going to step down to a XE252.

Jack
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Last edited by babydeuce; 14th-September-2006 at 08:21 PM.
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