350 crank in 327
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Joined: Mar 2003
Posts: 980
From: batavia, ohio
350 crank in 327
will this work? does it need any machining? any performance gains? does it need new connecting rods. does n e one know if a 65 327 is a 2 bolt main or 4 bolt main. give me the low down guys!
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Joined: Jun 2001
Posts: 1,209
From: TX
65 327 has smaller main and rod journals that 350, so you'd have to have them turned way down. Unless you can find a 67 350 crank; I think those were small journal type. 327 rods use smaller rod bolts, 11/32 vs 3/8, so would not be desirable over 350 rods. Yes you would get a power increase, but not worth the hassle, IMO. Just build the 327 or find a 350 rebuildable core. All 327's were 2 bolt.
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Joined: Jul 2001
Posts: 39
From: Kalamazoo-home of...nothing.
A 350 crank in a 327 block would give you a 350.
305/350 stroke= 3.48
327/307 stroke=3.25
327/350 bore=4.00
http://www.mortec.com/borstrok.htm
305/350 stroke= 3.48
327/307 stroke=3.25
327/350 bore=4.00
http://www.mortec.com/borstrok.htm
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Joined: Jun 2001
Posts: 13
From: Kaneohe, Hawaii
Originally posted by kacy
are you sure
are you sure
As for the crank, like I said, I'm not sure. He has a '65 327 block that was cast with the intention of using a 3.25" stroke 327 crank. That block might not have enough clearance for the counterweights on the 3.48" stroke 350 crank. It could probably be ground for clearance, but that can create its own problems.
Like angel71rs said, the main and rod journals will have to be cut down (I believe all 350's were medium-journal) .150 and .100 respectively. That is a SEVERE cut. Add it up and it's a lot of machine work (costly).
The later 327's used the same block casting as the 350's, and were machined for medium-journal cranks, so no problem there.
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Joined: Sep 2002
Posts: 9,705
From: Oakland, California
Actually the hot setup would be a 283 crank in the 327 yielding a 302. However the 283 crank is slightly different than the true 302 crank used in the MO 2-bolt main Z/28 motors in 1967, the difference being the crankshaft flange. Of course if you're truly going for a retro 302 you'd also need domed top pistons. The 68-69 302's used a different crank with a 2.10-in Rod Journal/ 2.45-in Main Journal, compared to 2-inch & 2.3-in for the 283 and '67 302.
The 327's also came with different crankshafts as well. For 65-67 they had the same 2.00-in/2.30-in Rod/Main sizes as the 283 & 302, then went followed with a 2.10-in/2.45-in Rod/Main in 68 & 69. Both series had a 3.25-in Stroke.
The 67, and 68-68 350's used different crankshafts, however they were both 3.48-in/2.10-in/2.45-in (Stroke/Rod/Main).
Now here's the thing though... in 1967, block casting #3892657 was used for the 302, 327 and 350 in most Camaros. Some '67 327's came with #3903352 in mid to late 1967. In 1968, block casting #3914578 was used for the 302, 327 and 350. (At least one '68 327 used #3914660.) Some 307's even used the same block casting in 1968. In 1969 when the 4-bolt 350 came into play, #3956618 was used for both 2-bolt and 4-bolt 350's and also the 4-bolt DZ 302.
So basically for the most part, a small block Chevy is a small block Chevy, and depending on the crank and machining done, you can pretty much make one into whatever you want. (Just avoid the POS '69 307's... they're useless.)
So as 2x4 said... a 350 crank in a 327 block would make it into a 350. Yes its possible, however you can do so much more with a 327 than that. (In fact in 1967 the 350 was sometimes referred to as a "revised stroke 327".)
(No I didn't memorize all this.... Chevrolet by the Numbers, 1965-69 a great book I highly recommend for 1st gen owners.)
The 327's also came with different crankshafts as well. For 65-67 they had the same 2.00-in/2.30-in Rod/Main sizes as the 283 & 302, then went followed with a 2.10-in/2.45-in Rod/Main in 68 & 69. Both series had a 3.25-in Stroke.
The 67, and 68-68 350's used different crankshafts, however they were both 3.48-in/2.10-in/2.45-in (Stroke/Rod/Main).
Now here's the thing though... in 1967, block casting #3892657 was used for the 302, 327 and 350 in most Camaros. Some '67 327's came with #3903352 in mid to late 1967. In 1968, block casting #3914578 was used for the 302, 327 and 350. (At least one '68 327 used #3914660.) Some 307's even used the same block casting in 1968. In 1969 when the 4-bolt 350 came into play, #3956618 was used for both 2-bolt and 4-bolt 350's and also the 4-bolt DZ 302.
So basically for the most part, a small block Chevy is a small block Chevy, and depending on the crank and machining done, you can pretty much make one into whatever you want. (Just avoid the POS '69 307's... they're useless.)
So as 2x4 said... a 350 crank in a 327 block would make it into a 350. Yes its possible, however you can do so much more with a 327 than that. (In fact in 1967 the 350 was sometimes referred to as a "revised stroke 327".)
(No I didn't memorize all this.... Chevrolet by the Numbers, 1965-69 a great book I highly recommend for 1st gen owners.)
Last edited by jg95z28; Jul 4, 2003 at 11:31 AM.
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Joined: Jun 2001
Posts: 13
From: Kaneohe, Hawaii
Originally posted by jg95z28
Now here's the thing though... in 1967, block casting #3892657 was used for the 302, 327 and 350 in most Camaros. Some '67 327's came with #3903352 in mid to late 1967. In 1968, block casting #3914578 was used for the 302, 327 and 350. (At least one '68 327 used #3914660.) Some 307's even used the same block casting in 1968. In 1969 when the 4-bolt 350 came into play, #3956618 was used for both 2-bolt and 4-bolt 350's and also the 4-bolt DZ 302.
So basically for the most part, a small block Chevy is a small block Chevy, and depending on the crank and machining done, you can pretty much make one into whatever you want. (Just avoid the POS '69 307's... they're useless.)
So as 2x4 said... a 350 crank in a 327 block would make it into a 350. Yes its possible, however you can do so much more with a 327 than that. (In fact in 1967 the 350 was sometimes referred to as a "revised stroke 327".)
Now here's the thing though... in 1967, block casting #3892657 was used for the 302, 327 and 350 in most Camaros. Some '67 327's came with #3903352 in mid to late 1967. In 1968, block casting #3914578 was used for the 302, 327 and 350. (At least one '68 327 used #3914660.) Some 307's even used the same block casting in 1968. In 1969 when the 4-bolt 350 came into play, #3956618 was used for both 2-bolt and 4-bolt 350's and also the 4-bolt DZ 302.
So basically for the most part, a small block Chevy is a small block Chevy, and depending on the crank and machining done, you can pretty much make one into whatever you want. (Just avoid the POS '69 307's... they're useless.)
So as 2x4 said... a 350 crank in a 327 block would make it into a 350. Yes its possible, however you can do so much more with a 327 than that. (In fact in 1967 the 350 was sometimes referred to as a "revised stroke 327".)
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Joined: Sep 2002
Posts: 9,705
From: Oakland, California
You know I totally missed that part. 
In any case, in 1965 the 327's came with either nodular bearing caps, and if it was a 300HP block or higher it should have chamfered main bearings. The bore/stoke/rod/main dimensions were the same from 1965-67 so with some machining anything is possible.
In any case, in 1965 the 327's came with either nodular bearing caps, and if it was a 300HP block or higher it should have chamfered main bearings. The bore/stoke/rod/main dimensions were the same from 1965-67 so with some machining anything is possible.
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