can you make a gm 305 block a 350?

15

Asked by Jun 04, 2009 at 07:55 PM

Question type: Car Customization

20 Answers

11,005

No you can not - Nice Try though

15

well that shows how much you know about gm because the 305 and 350 blocks are the same the only difference is the length of the stroke

1 out of 1 people think this is helpful.
6,675

same block but the largest displacement out of the 305 can get is 34x ci. cant reach the 350 ci with a 305

1 out of 1 people think this is helpful.
11,005

Main Bearing journals are a differnt size and will not fit a 350 crank A 350 block is a 4 inch bore a 305 is NOT and cannot be bored out to 4 inches as the coolant chambers are too close SO NO I say again it cannot

1 out of 1 people think this is helpful.
75

wat are you guys talkin about the blocks ARE the same and a 305 CAN be made to a 350 but its not worth the effort when u can buy a 350 used cheap and a crate for a RELE affordable price please if you dont know wat ur talkin about dont post

6,675

Lmfao!!! Dude just stop before you embarass yourself further. You couldn't be more wrong!!!

1 out of 1 people think this is helpful.
75

if im soo wrong then why do i know a guy who did it? he had a 350 with a hole in the block and a 305 with bad crank and he used the 305 machined it and re assembled it using the 350 internals(305 block only) he didnt have the money to buy a motor and he had the equiptment to machine it himself so it cost him $0 so YES it can be done with a little machining and i stand by my word that it is NOT worth it

2 out of 2 people think this is helpful.
11,005

Sorry you are confused - There is no way you are going to bore a block 1/4 inch to fit the 350 pistons As the previous person said GIVE up - Your wrong. ;b The bore on a 305 is 3.75-78 - 350 is a flat out 4.00 inches Do the math My Assumption is the bad crank was milled down to fit the journals of a 305 ( lot of metal but I suppose it can be done ) You would have to cut both mains and rods to 305 specs and he used all the internals of the 305. Would be my guess making of course another 305

11,005

Jeff - You asked a question Do not pretend to know the answer Bore Stroke Rods and Mains Diameter are all different

6,675

Lmao. I love listening to people talk out of their ass. There's 3 possabilities here. He lied to you, you're lyig to us, or you misunderstood what he did. Google the question. You will find that a can be made into something like 34x ci butnot 350 ci.

11,005

:) - I agree - Its a stroker 340 yer thinking of

6,675

yep. this guy is basically saying you could turn a 305 into 383 using his logic lol.

11,005

I have a stroker 434 in my Race car :) A Ton and a half does 12.33 @ 111mph ... Not bad for a heavy car and factory fuel system :) I am done with this topic Take care Chase

75

sorry to all i just called him and it was a 327 block as he later found out at the time we thought it was a 305 becuz that is wat we were told it was

1 out of 1 people think this is helpful.
45

No.

6,675

The 400 ci block is much different. The 2 inside cylinders on each side are closer than the outside cylinders. Spacing isn't even and it creates problems for boring the engine out in many cases.

1 out of 1 people think this is helpful.

remember mexican blocks have off set bores. dont get them

30

All of you are partially wrong. 350 and 305 cranks are the same. as long as you have same journal family. 350 has a 3.48 stoke and also 305. the only thing that seperated them is bore size. the 305 crank has weight removed for balancing purposes . Chevy 302,327&350's are all same blocks but not 305'. a 304 can be stroked to a 34x sumthing. depending on boring sizes availible

3 out of 3 people think this is helpful.

I hope you can help me, you can replace a 305 by 350 Chevrolet, thank you very much for your help

Jeff is completely wrong everything in the 305 and the 350 are the same exc. bore 350- 4" and 305-3.736. Rods are 5.7,stroke 3.48,main journal 2.45 and rods are 2.10 this is for both 350 and 305. As far as boring it to 4" the sleeves might be to thin. May work for awhile or may be to hot. Not with the investment in my book.

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