dblgun is right, the numbers don't work, unless you forget like I did to add the cc's of the deck height to the chamber when you compute compression. It will be a weak suck 8.15 with those extra cc's added.
Call JE, get exactly what you need. Hers some reference data. http://www.jepistons.com/PDFs/TechCorner/SCPDrawings/JE_Piston_terminology_and_features.pdf
You will need some deep gears to show the 383's the way home. Just run them an 1/8 and shut off not giving them a reason to fly by. I ran a 62 ChevyII with a .060 over 283, 60 Rochester injection, and L79 cam with 1.87 valves. Kicked a-- with 4.56's and better with 4.88's. First have fun....the rest will just happen.
My 57 BelAir had a 283, the rear had 3.08's, when I blew those up I replaced them with 411's. Felt like I put a blower on it.
My total number of .038-.040 was including the gasket thickness, that about as tight as you can get it without interference. I have angle milled plenty of heads, and it is a great method of aging compression and making some power, but remember it also means you will need to mill the intake flanges to match the angle, and most likely you will also have to do some port matching and will be cutting out your own manifold gaskets due to needing a thicker gasket to make up the difference. I vote for no angle mill unless you have the patience to get everything fit right. It's great in a race combination, but in a street deal I would just keep it with a stock angle.
As far as the 305 heads go, they are very thin castings, and commonly crack, I would stay away from those. Again, in Nhra Super if you had to run them for your combo you were stuck, but you already have a good flowing head with those 461's, just a little clean up and your good to go.
We used to angle mill 461 heads .100in circle track engines and the Chamber volume would be in the low 50 cc range. That was with the chambers unshrouded for 2.02 valves. I wouldn't go that far on a street engine but .080 would work fine. You need to plug the spark plug cooling ports to mill them this far. You can also go .005in out of the bore with a stock felpro blue head gasket. This was giving us around. 035 for deck clearance. It worked on a 350 spinning 6500 lap after lap. The big domes on 13to1 283 pistons really mess up combustion. They block the spark plug. Thats why the angle plug heads were the hot ticket. The plug was located higher to get above the dome.
1. Buy custom pistons for the 3 7/8 bore of a 283. You can get any dome volume and pin height you want, along with a modern ring package. Or, 2. Bore it 1/8th to a 4 inch [ 301 back then] and find a cheaper off the rack piston. The bore also bumps the compression ratio up. This was the hot set up in the day. Unshrouds the intake valve too. Screaming little motor. Don't angle mill the heads. Big pain in the ass. Manifold will need milling, intake manifold bolt holes need work. Just my two cents.
Yes....that more or less boils it down to where i'm heading with this one! Guess first step will be to sonic check the block and decide from there. It looks very good with the naked eye. Alomst no rust at all on the outside of the cylinderwalls, but that won't tell the whole truth i guess... If it feels like it could hold up, i probably will bore it out. Bigger bore in itself will help some (c/r, heads, gaskets) and piston availability will be another thing altogether.... If that feels too unsafe, i just have to order a new custom set of pistons i guess...... But you nailed my thinking right now /Stefan
Well....maybe the 302 saga ends here..... crank turned out to be cracked in several places... Eventually i found another. Otherwise i'm given a 454 from a friend. We'll see where it goes from now on.... Sent from my iPad using The H.A.M.B. mobile app
First I am not advocating running this crankshaft, but there are thousands if not millions of crankshafts just like this one swinging around in engines right now. I once took the oil pan off a 54 Olds for the first time in it's life to find that the head one main bolt on two different main caps were in the pan and it appeared had been that way for many years. It is truly amazing what these units will put up with and never give an indication anything is wrong.
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