76mm crank fit in modern case

[stevehenderson]

Do you need to clearstory 76 found one used from friend.
I know 78 you do.

I have case cut 94 welded 3 line boared never used.

[madmike]

should fit but I really can't believe how guys shy away from a little clearance work It's not that hard, more time consuming Just install crank with rods and check where it hits,, can be done with a 'Dremel '
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[Casting Timmy]

It was really easy to clearance my case for a 76, some cases can take a 78 dropping in from what I read here on thesamba.

Go slow and take your time, some use double rubber bands on the studs sticking out to keep the rod pointed in the right direction. If nothing else rotate the round to roughly the right position to show yourself how much to clearance. This will helpto show you that you don't have to clearance as much as you think in some areas.

Last note is keeping the crank pulled back to simulate the thrust being set, other wise with it an 1/8" forward you will think you have extra clearance work to do.

After you do this 76 crank you won't mind doing bigger strokes by hand.

[oldschool5er]

I just did one using stock rods and A pistons that were customer furnished parts and it took both clearancing the case and the piston skirts.
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[Casting Timmy]

He reminded me of a very good point with 76 cranks...the old method was stock rods and A pistons, these motors are wider and people did not like building them.

5.5 rods and B pistons with 94 cylinders are a lot easier build. It took me a while to figure that out while researching my 76 stroke build plans.

[pyrOman]

Did an 85.5 x 78 and it was relatively easy. So much so that I just finished another in short order with a 74 crank!
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[stevehenderson]

My combo has to stay realtivly small
I have built 82*94 before.

92 after AA thick walls * 76 crank
041 heads home ported exhaust ported enlarged.
Stage 2 Engle cam kit.
40 idfs

I have a case cut for 94mm and the rest of the parts except crank.
Case ready to go cut 94 welded #3.

[pyrOman]

While the 74 "looked like" it would clear my stock case, I went ahead and cleared it some anyway. Can't hurt!

It cleared good at the top of the case though.

Also, I did have to clear a bit at the bottom of the cylinders, however, I doubt you'd have to even bother with that since your case is opened to 94s.


This set up is running very strong now with a progressive carb but I will swap that with a pair of 40 Webers next!
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[mark tucker]

it may depend on the rods...and the case too. Ive had to clearance cases for 69 cw crank ... just remember when doing it & checkingf it the rods need to be in thier running position, not just on the crank, thats how someny cases get holes in them form somebodt trying to clearance with the rod just dangling..I like to use a old cylinder&piston to keep it all in the correct position. dontr assure it willo or wont, check it.

[yamaducci]

You can also use two rubber bands going through the pin end bore and wrapped around the 4 studs. This will center the rod as you rotate to simulate running position.
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[mark tucker]

if your rubbers are the same strength&length.

[modok]

Pyroman has it easy. Aftermarket rods and the less beefy case.
Modern cases? not sure.

The late 70's cases I like to use the center main web is cast thicker and that area almost always needs work to fit counterwighted cranks.

[pyrOman]

[pyrOman]

All this talk about clearing just brought up a memory... My first stroker was built on an already clearance and bored new mag case I scored at the Classic. "Ready" for an 82 x 94, as I was putting together the #4 rod looked way too close to the cam sleeve for my liking so I still had to do a bit of clearing there as well as another bit on the center cam bearing boss. Meaning, as already has been stated, that you should ALWAYS check and double check everything for clearing upon assembly!!!
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Some people are so busy being clever they don't have time enough to be wise.

[mark tucker]

my first was a 78 with slipery 87's in it. also when doing the center cam bearing tower, be carfull and stay away from the oil groovey thingy so you dont end up with a big all internal spew and loss of pressure.

[icemanhd]

One mans opinion... If you use a 76 Chevy Journal crank and stroker clearanced I beam rods (like the ones AA/CB, etc... sell) the clearancing is very minimal. Smaller diameter chevy journal helps a fair amount and you can run B pistons and a 5.5" rod... Great combo.....
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