Thread: bigger heads on a 283?

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any advice on replacing my 172 intakes with 194"S I.E by using 327 heads with the bigger valves.running a comp 270 magnum and 1.6 roller tips and 600 edl carb and intake with ram horn duals and th 350,355 posi. thanks !

You can move up to the 1.94 valve heads to make it breath a little better. My 283 still has the 1.72 intakes but I'm thinking of moving up. As far as a cam it kinda depends on alot of things. I have had good luck with the 327 cu in 350 hp cam in mine. I think it's discontinued at G.M. but is made by some aftermarket cam grinders.

Bob

1.94 1.6's world work good 2.02 1.6's even better but they are getting $$$

1.94's don't work as good as you might think on a 283. The cylinder walls shroud the valves a bit. 283 hi-po heads have smaller valves with big ports, seem to make as much power as the big 'uns.
The 350 horse 327 cam is a good one, I've had them in 283, 327 and 350 engines.

You may be better off with some 305 heads or aftermarket 305 heads (World Products 305 Torquer heads) as the cylinder walls will not shroud the valves and create those kinds of combustion problems. You can pocket port 305 heads and they will perform much better than the old 327 heads.

Yeah, what rum said. Rather then just looking at valve sizes, look at the overall potential of the head for improving performance.... There is a whole lot more to cylinder head efficiency then just valve size. Sometimes smaller IS better!!!

oh i forgot about my 4 inch bore

Originally Posted by Dave Severson

Yeah, what rum said. Rather then just looking at valve sizes, look at the overall potential of the head for improving performance.... There is a whole lot more to cylinder head efficiency then just valve size. Sometimes smaller IS better!!!

Well said, bigger isn't allways better .

i have 327 double hump 461 casting heads on my 283 they are decked for one point of compression, 3 angle valve job, sodium core valves, edlebrock torquer intake (its an older style one) its also bored .30 over and i have a 327 crank in it. the cam has .525 lift and .230 duration @ .50. i am by no means a chevy guy but i had all the parts laying around and only had to pay for machine shop work and it turned out to be a bad*ss little motor. but the heads i have are pretty good for making power (or so i have been told) apparently there is a 461X casting that is supposed to be better than my 461 casting heads but im not sure, also im not too sure of the combustion chamber size on my heads either, im really bad with remembering numbers so i cant help you there but im sure someone around here know what size the chambers are. see if you can find a set of 461 heads around 461 will be the last 3 digits in the casting number (located under the valve cover) you might also want to go with a set of heads from GM performance they are supposed to be pretty decent and affordable

the heads i now have are the power pack (pyramid) marking 1965. i've been running the comp magnum 270 with 1.6 roller tips for at least 5 yrs.the impala runs strong with a th 350 ,shift kit and 355 posi especially in the mid rpm range and going through the 3 gears it chirps the tires when shifting from first to second.i was just wondering if 194 heads would let it breath better.isn't that the largest size on a stock bore 283? the carb is a edl 600 cfm on a edl hi rise..thanks for any more ideas !

You cannot beat brand new--check this out for 305 heads. You will be money ahead going this route. www.worldcastings.com/prods_pages/043600.htm

I do remember putting the 1.94's on a bunch of the old 283's back about the same time Lassie was a pup. They did help the performance, but as rum said, the technology and flow charachteristics of the new heads would be even better... Depends on how much money you want to spend, and how close to original you would want the car to remain....

i'm looking at world heads from summitt cast iron loaded with 194's for $759 a pair.already have hardened valves for puke gas.

Originally Posted by james fuller

i'm looking at world heads from summitt cast iron loaded with 194's for $759 a pair.already have hardened valves for puke gas.

I would try Competition Products 1-800-233-0199 if you are looking for cast iron heads.

wow! checked their web site and dart cast iron 194 150's are 600 bucks ! thats 140 less than summit world heads. don't know how much shipping is though as i'm only 20 miles from summit in ohio. i ordered their catalog their out of wisconsin...thanks !!