i have a 283 bored .030 over and am going to be putting a set of aluminum heads with 2.02/1.60 valves on it in the very near future. will i have any clearance issues with the valves and the block deck? by my math it should fit, but a friend of mine voiced some concerns about the valves making contact with the block deck. any input will be greatly appreciated!

thanks in advance
karl

 

The valve may clear the cylinder wall, but you will be shrouding your air intake charge around the bigger valve. I would try to stay with a good 1.94/1.6 valve combo instead.

 

well i was originally looking for a performance head with the smaller intake valve, but was not able to find one in an aluminum, and definately not for the price i payed for the heads i got, so im gonna go ahead and try them and hopefully it will all click good enough.

 

I nice set of Vortec heads will work great with that. They have the smaller valves from the factory & have the "fast burn" style combustion chamber. You can purchase them with the old style manifold bold already drilled/tapped.

 

+1 or you could get them out of a junkyard. They work good with like 525-550 lift on a 350. I have no idea on a baby cube sbc though.

Don't bother porting either. Just a good valve job and go.

 

Curios why are you running such a small motor?

 

Got to be that you can turn it like 10k!!

 

the motor is in a 1966 chevrolet C10 that i purchased from the original owner. it is a 283/3speed truck. since buying it ive rebuilt the lower end and it has a forged steel crank, forged pistons, chromoly rings, lunati cam, holley street dominator intake, holley carb, mallory ignition, flowtech headers, and flowmasters dumped before the rear axle. the heads i currently have on it are the stock heads, and some of the valve guides have finally had it, so im replacing them with a pair of patriot performance aluminum 2.02/1.60's. the 283 is a very good, and fuel efficient engine. im still pullin near 20 out of her on a daily basis which is far more than i can say for any newer truck. as far as rev potential, yes she can handle some high rpm's, but i normally dont abuse it like that. once i go to some eagle H beam rods and a solid lift roller cam i may attempt some 9k rpm spins, but until i have those parts in her, ill stay under 7k.

 

oh, and as for the vortec heads, in my opinion for my application they are not cost effective. i paid 750.00 for my heads brand new, and if i went to the vortecs, especially in aluminum id pay much more, and have to buy a new intake manifold. not worth it to me.

 

For a street motor I don't see why you wouldn't run a bigger motor, a 283 is great is you rev it to 8,000 rpm, but for a street motor I would think a lower rpm range and more cubic inches would give you better results, like a 383 or 406.

 

I had a 64 GMC truck 283 bored 30 over W/ 1.94 fuelie heads w/280/480 cam it had no torque at all but it could go too 7 grand.You would be better off w/a 350ci.

 

you all are totally right, i could do just like everyone else does and go to a 350, but i kind of like having something more unique and personalized. besides, my little motor has whooped up on a lot of other small block powered trucks running the stock heads to boot.

 

There is nothing wrong with a 283, they can make some great power on the top side. Just gear the vehicle accordingly and make up the TQ with mechanical leverage.

 

I dont think those heads have any odd valve spacing you should be ok.
at least my brodix heads with 2.02's didnt hit when I mocked up my 283.

with a little boost, that small engine will think its alot bigger, and get 20+mpg.
thats what I'm doing with mine at least, with a smallish turbo.
as gas prices continue to rise, you will see more of these engines being dug up. heres someone who got got good results thinking outside the box.
http://www.theturboforums.com/smf/in...?topic=97853.0

 

crazy thing is that a friend of mine has the stock turbo off his 87 GN and im thinking of buying it from him and fabbing some headers and down pipe and so on to install it on my 283. i think it could really wake it up on the topside.

 

I have run several 283's in my time, as someone pointed out the 2.02 valves will be shrouded and will deffinately hurt performance, a couple other things you should be aware off is that with short stroke, small bore engines building compression is hard to do, if these heads are 64cc chambers with flat tops your compression is going to be around 8.5 and if you have even bigger chambers like 76cc your compression is basically useless. The 283 are great on gas milage but the heads you are putting on are going to kill it as well as any lowend TQ. Another note for some performance is the runner length, if these heads are much over 165cc in length that will also hamper kill any lowend tq. My recomendation to you would be sell those heads if you already have them, if you havent purchesed them yet DON"T. Here are a few choices best top-down

http://store.summitracing.com/partde...5&autoview=sku

http://store.summitracing.com/partde...5&autoview=sku

http://store.summitracing.com/partde...5&autoview=sku

As I stated above I have ran a few 283's, a couple of these ran excellant, 1 was a 283 .030 bore with fuelies with flat tops that I was able to pull the frontend off the ground in a 56 chevy pick with stock gears (3.90) and a super T-10 four spd, I averaged around 16mpg no matter how I drove it (which was usually hard) the other had 12.5 piston bored .060 in a 62 chevy PU with fuelies that I loved racing those mustang GT's with there HO 5.0L, even with a 4speed and 3.90 gearing in it I used to average around 16 mpg. I had a buddy running a 283 with .060 bore, 12.5 pistons, fuelies with a 292 cam in a 69 Nova with 4.88 gearing and a vega converter and t350 trans, I would walk all over him in the city with my 56, but if we where cruuising and he nailed it would would **** & git as they say, he had nothing below 4000rpm but from 4-9000 you couldnt grab a dollar bill off the dash.

Also note that although Vortec heads are good heads, they are best for lowend and midrange, topend they start falling off rather dramatically (4500rpm & up), if this was just for a daily driver I would recomend the 305 HO vortec heads