need help

[fat john]

ok i need some help i have a 75 620 it has a L 16 it smokes so it needs rings

i picked up a 76 620 for parts it has a L 20 B so the motor now is all apart

my buddy came over the other day an we miked the bore i think it was 3.36

is that the stock bore for the l 20 b?

[metalmonkey47]

Stock bore on L20B is 3.35

[Jayden71]

is that all you needed help with??

[fat john]

ya i think so thank you

[datzenmike]

Not much of the L20B will fit the L16, you're further ahead rebuilding the L20B and swapping it in.

 

The bore should be measured at 6 places inside. About 1/2" down, 2" and 3" and at 90 degrees to those. This will give a better idea of it the cylinder is tapered or oval shape. The L20B is 86mm bore.

[fat john]

thank you

the l 16 in on its last leg

l 20 b is it but i have to have the bore bored out

it looks like the last guy to drive it had blown the head gaskit

an you all know what water will do to the metal but the parts truck

was cheep vary cheep

[datzenmike]

Pistons fit the bore to close tolerances, so buy the oversize pistons first and give them to whoever does the boring. He should measure them and bore to fit the pistons.

[fat john]

thank you i will

[banzai510(hainz)]

Id be leary of that motor.

L20 is a 6bolt crank your L16 is 5 bolt so there will be clutch issues for sizeing

[fat john]

i did the clutch on the l 16 an a rear main seal but i didn't think of that

but i was thinking on putting on a new one but know i know i have to thank you for the in foe

[fat john]

an how about the head i think the l 16 has a l 20 b head ?

[fat john]

holed on if the fly wheel is off an l 20 b then im good ?

[fat john]

on the head it says u 67 on the l 20 b an on the l 16 it says a 87 ? witch is the best one to use ?

[fat john]

[fat john]

the first 2 are my truck the other 2 is my parts truck

[datzenmike]

an how about the head i think the l 16 has a l 20 b head ?

holed on if the fly wheel is off an l 20 b then im good ?

on the head it says u 67 on the l 20 b an on the l 16 it says a 87 ? witch is the best one to use ?

 

The U-67 is the best head for the L20B, the A-87 head is the best for the L18. The best head for the L16 is a 210 head.

 

L16 and L18 have 5 bolts holding the flywheel on. The L20B has 6. They will not interchange

[fat john]

think you so i have the same fly wheel an head for the l 20 b

that head is in bad shape u 67 that is what is there any

other parts that i need from the l 20 b

[Rays74]

Did you say you have a 6 bolt flywheel to fit the L20B?

The one from the smaller engine won't work.

 

Tough to read your replies.....