my 383 hates me and i need help

[TylerT/AZ28]

So i decided to build a 383 for my truck since it was already bored over and the stock crank was shot. i got a good deal on a new eagle crank and im enountering a ton of problems with rod and cam clearances. ive tried 4 different types of rods and they all hit the cam somewhere. i really dont have a clue what to check for or do anymore i used eagle rods, two types of stock rods both aluminum and steel, and i think bryants and they all hit. i can knick all of them with a grinder except for 4&5 which hit an insane amount. anyone have any ideas so that i dont hulk this engine through the air from being angry at it and regretting it later?

[TORN]

small base circle cam?

[hoogiesngrinderz]

small base circle cam?

Agreed. Already recommended this, but it's a chunk of change. I'd personally run the rods that were used when balancing the rotating assembly and leave them untouched (or ground as little as possible)

[TylerT/AZ28]

i did use those, 4 and 5 i ground down alot more than the others and its still touching a ton. i dont think i have enough to spend on a small base circle cam, lifters and all that.

[TORN]

Now you see why people build a 357 and call it a day they are way cheaper to build, if you don't have the money you might want to rethink this motor idea you got cause you can't make a reg cam work.

[1BADAIR]

arp 134-6027 bolts help some

[TylerT/AZ28]

i have quite a hefty amount into it already. i was told the rods would work because they worked in a friends truck he came over and didnt have a clue why mine dont. i may have figured the issue out so ill keep you posted. i imagine i have to get everything rebalanced after grinding aye?

[85z28kid]

Scared of grinding them? Lol what do 4&5 rods look like?

Your a lot might not be that much.

[TylerT/AZ28]

i got them pretty much figured out i think, its not so much the head os the stud as to the surrounding corners and hard edges that need a shave. do you think i should get everything rebalanced now?

[hoogiesngrinderz]

Depends on how close they balanced the rotating assembly. Did they give you a spec sheet when you picked it up?

[TylerT/AZ28]

no they did not, i want to not do it and say i dont need it because the darn thing was so unbalanced i found out when i originally took the 350 apart

[hoogiesngrinderz]

and what did the internals look like when you took it apart?!

If they went +/- 5 or 10 grams, you should be in the clear. Call the shop and ask what their typical balancing tolerances are. OEM motors are said to be +/- 25 to 30 grams even.

Just for reference, the weight of a nickel is 5 grams and a penny being 2.5 grams.

[TylerT/AZ28]

looked like a mess. the balanced flywheel and harmonic balancer were sorta counteracting each other and it was way off balance.

ill give the shop a call tomorrow and ask them what their tolerances are and update from there

[hoogiesngrinderz]

Just did a rough calculation. For every gram you take off the near the bolt head, you get about 6 lbs of centrifugal force at 5500 RPM.

Not a huge deal, but worth considering if their tolerances are loose