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Author Topic:   Stolen Block ???
YLO JK8
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posted May 25, 2005 11:18 AM     Click Here to See the Profile for YLO JK8   Click Here to Email YLO JK8     Edit/Delete Message   Reply w/Quote      
I bought a 79 berlinetta about 8 yrs ago, It
ran great and looked awesome so I didnt care about the motor. The previous owner had shaved all the numbers off the block,and now Im baffled.... It has 4 bolt mains, and has crankshaft # 3932442 The heads on it are 333882 ( with steam holes ) I am told these heads can go on a 350 or a 400. It also has the G style pistons,I am told are from an 86 or later 305. (this shiznits crazy)I know this probably isnt enough info to tell me what my block is but any input would be cool.
Also I know if you have a 400 block you are supposed to drill steam holes in the heads.,
But if you have a 350 block are you to drill steam holes in the block for 400 heads ????

Serious GURUS only need reply!!!!!

------------------
yellow jacket 79

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GetMore
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posted May 25, 2005 05:38 PM     Click Here to See the Profile for GetMore   Click Here to Email GetMore     Edit/Delete Message   Reply w/Quote      
Sorry, not a guru, but I'm going to chime in anyway. :P
You do not need to drill a non-400 block to match the holes in 400 heads. Don't bother giving this any more thought.
If you have 305-type pistons, then you have a 305. (Or possibly some oddball thing somebody made up if they used some funky crank and rod assembly. Of course that would involve spending a decent amount of money and I don't think anyone would bother, so we are back to it being a 305 if you have 305 pistons.) BTW, IIRC 305 pistons are 3.78" diameter.
The 305 uses the same stroke as a 350, but the cranks are different due to the difference in piston weight.
The '86-and-later blocks have one-piece rear main seals, I think all '87-up blocks are cast for roller cams.

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YLO JK8
Member
posted May 26, 2005 10:15 AM     Click Here to See the Profile for YLO JK8   Click Here to Email YLO JK8     Edit/Delete Message   Reply w/Quote      
quote:
Originally posted by YLO JK8:
I bought a 79 berlinetta about 8 yrs ago, It
ran great and looked awesome so I didnt care about the motor. The previous owner had shaved all the numbers off the block,and now Im baffled.... It has 4 bolt mains, and has crankshaft # 3932442 The heads on it are 333882 ( with steam holes ) I am told these heads can go on a 350 or a 400. It also has the G style pistons,I am told are from an 86 or later 305. (this shiznits crazy)I know this probably isnt enough info to tell me what my block is but any input would be cool.
Also I know if you have a 400 block you are supposed to drill steam holes in the heads.,
But if you have a 350 block are you to drill steam holes in the block for 400 heads ????

Serious GURUS only need reply!!!!!


Thanks for the info, ( kiddin about the guru ). Its amazing how many parts are interchangable on chevy motors, but thats part of what makes em so cool. Ill check for the one piece seal. At least that will home in on the date. THANX

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