327 Differences?
Thread Starter
Drifting
Joined: Feb 2010
Posts: 1,732
Likes: 267
From: Richmond Texas
327 Differences?
Okay, I am still searching for a 327 to build for my Corvette. I want to get an early model block so I can retain the original looking PVC and Rear vent set up.
I found a guy who says he has a 69 327 out of a Truck, but it has the PVC valve hookup at the back of the block with the vent at the oil filler tube (backwards for a 66 Vette), First I really don't think it's a 69 model... But does anyone know for sure if you can use the Corvette -Rear of the block type- vent setup on a block that has a the other PVC set up? Without taking them apart, The corvette tube looks larger than the hose connector for the pvc valve on the other motor... but it may be smaller underneath.
So ???? Anybody know for sure?
I found a guy who says he has a 69 327 out of a Truck, but it has the PVC valve hookup at the back of the block with the vent at the oil filler tube (backwards for a 66 Vette), First I really don't think it's a 69 model... But does anyone know for sure if you can use the Corvette -Rear of the block type- vent setup on a block that has a the other PVC set up? Without taking them apart, The corvette tube looks larger than the hose connector for the pvc valve on the other motor... but it may be smaller underneath.
So ???? Anybody know for sure?
Burning Brakes
Joined: Jun 2007
Posts: 1,062
Likes: 10
From: Dallas TX
Someone else can answer regarding the PVC. Not sure I completely follow the setup of running the vent from the back of the block to the filler tube on the front. Not that this matters in appearance, but in 68 they switched to the larger rod journals so rods are not interchangable. I have a set of later rods if you need them.
I would keep looking. If you are just looking for a 327 block and doesnt have to be a corvette, I know a guy in N Houston who can probably hook you up. He has a shop there with a ton of parts.
I would post the casting number on here or look it up. Then we will know what you have exactly.
I would keep looking. If you are just looking for a 327 block and doesnt have to be a corvette, I know a guy in N Houston who can probably hook you up. He has a shop there with a ton of parts.
I would post the casting number on here or look it up. Then we will know what you have exactly.
Burning Brakes
Joined: Jun 2000
Posts: 844
Likes: 2
1969 was the last year for the 327 (C60 truck, Impala etc.). The 68 & 69 327's had large journal cast cranks & 2 bolt mains, except the high performance versions (68 vette) and heavy duty or severe duty applications (dump trucks, school buses and other C60 series) - those had forged large journal cranks. There have been rumors floating around for decades about the 69 C60 series 327 also having 4 bolt mains, but I've yet to see any. These 68/69 302, 327 & "67 Camaro 350" large journal 4" bore blocks are good foundations for a mild build where you still wish to retain a rear vent hole.
That PCV setup sounds similar to the 63 vette 327 system and will work. The carb pulls air in from the front fill tube and through the crankcase, via the PCV in the rear vent hole. It can easily be switched to the reversed flow of the 66/67 style.
That PCV setup sounds similar to the 63 vette 327 system and will work. The carb pulls air in from the front fill tube and through the crankcase, via the PCV in the rear vent hole. It can easily be switched to the reversed flow of the 66/67 style.
Last edited by Viking427; Mar 16, 2011 at 01:04 PM.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,920
From: Washington Michigan
Any 327 block with the crankcase vent hole in the back next to the distributor will accept the Corvette-type PCV system; the other end of the system only requires an intake manifold with an oil fill tube. All of the bolt-on parts to create the PCV system ('63 type, or '64-'67 type) are available from the usual vendors. 
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
This is what the back of the block and lifter valley should look like with the intake manifold removed...
Sorry it isn't such a pretty sight, but that's what 36 years of storage can do to a 327 that was running 12's when it was put away.
Good luck... GUSTO
Sorry it isn't such a pretty sight, but that's what 36 years of storage can do to a 327 that was running 12's when it was put away.
Good luck... GUSTO
Race Director
Joined: Mar 2009
Posts: 19,777
Likes: 4,592
From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
Must of been a rockin little motor back then. I can't recall seeing that lifter setup. I'd want to make sure it's magged, and checked for oversize bores for sure, all part of any rebuild anyway. Don't know how those covers fit over the rockers though? 
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
It ran very well back then, and actually the rockers cleared just fine under those stock covers... ($11 each over the counter back then...)
As for the cam... well ...it's a bit of a story...
http://www.cardomain.com/ride/315035...orvette/page-2
Good luck... GUSTO
As for the cam... well ...it's a bit of a story...
http://www.cardomain.com/ride/315035...orvette/page-2
Good luck... GUSTO
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Pro
Joined: Aug 2010
Posts: 578
Likes: 11
What year 327 are you trying to replicate? Here's a picture of my '62 327 with RPO 242. It replaces the crankcase breather pipe that spews oil on the bottom of chassis. This set up reroutes crankcase blow by from the base of carb.
Pro
Joined: Jul 2009
Posts: 634
Likes: 5
From: Saskatoon SK
1964 327 with out rear breather?
sorry for taking the post a little off topic.
