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  #16  
Old Jun 12th, 08, 11:53 AM
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Vintage 68 Vintage 68 is offline
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John
 
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Wink Re: how to increase horsepower with 327

Quote:
Originally Posted by FRANK ESKRA View Post
PDQ67
The 327/340 hp ... That engine was only offered in a Corvette and had a alum. intake with a C series carter AFB in 1962. It WAS NOT what you called a medium valve engine as well. The 461 head was introduced in 1962 and had a 2.02 intake and a 1.500 exhaust valve. If it had a 461x head which was very rare even then the valve size was 2.02 and 1.600. ...
Nope
I owned an original 1962 RPO-396 (note '62 was the last year for all letter engine options - '63 on used a Letters/Numbers, i.e. RPO-L79 & etc., option designation. ) 327/340 Corvette for many years and the heads (-461X) were "Medium Valves", in that they were 1.94" (most common SB sizes are 1.72/1.94/2.02") Intakes.
I took that engine apart many times
All Chevy Performance heads were max. 1.94" Intake valve size until 1964 when the 2.02" valves size was introduced - most don't realize the 2.02" valve heads didn't come out 'til then.
These earlier style heads, used on both 283's and 327's, were commonly called "Power-Paks" v.s the '64 on "Fuelie" heads.
I think this older designations has gotten lost over the years and everyone I hear now just refers to any 'Double-bump' head as a 'Fuelie' - I usually don't bother to correct folks anymore ...

I also owned an original 1962 Impala SS with a 327/300 for many years, and it was a Rochester "4-Jet" - NOT a Carter carb on it - because it was an Auto
The 327's got different carburators depending on the transmission type.
Only the Manuals trans cars got the WCFB's (some HP were AFB's ) on them.
I worked on many of them back-in-the-day and still have most of the service books and a full set of Carter 'Gauges' (yes, there is such a thing ).
I was the second owner of the Impala and the car was untouched when I got it - one of the many I would LOVE to have back, they guy who owns it in SoCal. won't sell it back - and he's younger than me

I have a data sheet somewhere that list the major spec.s for the 327 RPO codes.
There were lots of RPO's for that engine in 1962. I remember RPO-300, 397 (what was in my Impala), 396, 582, 583 and I think there were one or two more ...

Hopefully JohnZ will see this post and will have more of the original confiquration information for these early Corvette and 327 engines in his NCRS
information.
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  #17  
Old Jun 12th, 08, 03:31 PM
pdq67 pdq67 is offline
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Default Re: how to increase horsepower with 327

I know about the 1.94"/1.50" -461x double hump heads that were used on the 315hp/283 FI engine.

And that prior to '64, the double hump heads were just medium valve jobbers b/c I have a virgin chambered pair of 2.02"/1.60" valved -461's in my garage now.

I just got screwed up on the intake systems on the early 327's is all.

pdq67
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  #18  
Old Jun 13th, 08, 09:34 AM
RaiderNation67 RaiderNation67 is offline
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Default Re: how to increase horsepower with 327

im looking at this engine 350ci bored .030 over 4-bolt main #207 cast the rotating assembly bought from summit racing the crankshaft is forged steel scat, the rods are eagle forged, the pistons are alum speed pro dome top rated 10:1,
cam is a crane 485lift w/284 dur, dual roller chain,meling oil pump,
bolts are mr gasket hardend,new rings,bearings ,gaskets,chrome dress kit,edelbrock perfomer intake.
heads are camel hump w/194 valves

what doe you guys thinks about this engine heads
camel hump heads w/ 194 valves???
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  #19  
Old Jun 13th, 08, 10:31 AM
John65nova John65nova is offline
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Default Re: how to increase horsepower with 327

Quote:
also owned an original 1962 Impala SS with a 327/300 for many years, and it was a Rochester "4-Jet" - NOT a Carter carb on it - because it was an Auto
The 327's got different carburators depending on the transmission type.
Only the Manuals trans cars got the WCFB's (some HP were AFB's ) on them.
I thought all 62-64 327/250s has 4GC on PG cars and WCFB on manuals w/ 1.72/1.50 Powerpack heads, and that ALL 300hp cars had AFBs and "camel hump 1.94/1.50 heads. Are you sure your '62 wasn't a 250hp car?
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  #20  
Old Jun 13th, 08, 07:51 PM
Z15CAM Z15CAM is offline
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Default Re: how to increase horsepower with 327

I've a 327 + .30" with the 4 Bolt 010 block decked .020", forged large journal 68 crank, SIR Rods, TRW Forged Dome pistons giving me a 10.75 Static Compression and the 68 1.94/1.5 64cc heads which I built to 2.02/1.6 Grumpy Jenkins Specs (Never Again - LOL). Manley Pro Flow Severe duty Valves, RKM Shaft Roller Rockers, Edlebrock RPM with a Holly 750DP. I run a Sigerson F296-1 Mechanical Flat Tappet. GM 4 Quart Vette Pan with Windage Tray. Will rev 8000rpm easily. HP (guessing) would be approx 425Hp.

This is a spare engine for my 70 z28 or if I decide to swap out the BBC.

I did one for a friend running 6" rods and 350 pistons - I've built lots of 327's in my day - LOL.
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  #21  
Old Jun 13th, 08, 08:14 PM
smits67 smits67 is offline
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Default Re: how to increase horsepower with 327

If you are now searching for a new engine; consider a "crate" 383. There are several good sources for them now and they make great power.
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  #22  
Old Jun 13th, 08, 08:48 PM
pdq67 pdq67 is offline
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Default Re: how to increase horsepower with 327

I just PM'd JohnZ and asked him to tell us all what the differences are between the 327's and the 283's, (if he wants to get into the little engine).

pdq67
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  #23  
Old Jun 14th, 08, 06:21 PM
sbcBill sbcBill is offline
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Bill
 
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Default Re: how to increase horsepower with 327

I do not mean to sound silly but there are many similarities between the 283 and the 327 depending on the horsepower level of the 327. Aside from the differences in bore and stroke dimensions between the 2 engines they can share many identical interior components. Let us assume the 327 is a small journal since there was never a large journal 283. Crankshafts will interchange to make a 301/302.

The 210 horse 327 shared the same 283 power pack heads, hydra cam, connecting rods, four valve relief cast flat top pistons (4" bore not 3 7/8"), and 2 barrel carb and intake manifold.

The 250 horse 327 was identical to the 210 horse engine except it had the Rochester 4 barrel carb not a Qjet.

The 300 horse had a different cam, 1.94" dia camel heads, the same 327 pistons, usually a Carter AFB 4 barrel on a larger runner intake manifold.

The 340, 360, 365, and 375 horse engines had forged 11.25 domed pistons all of the small journal engines used a forged steel crankshaft and 2.02" dia. valves on the higher horse engines. The cam was the 346 GM solid cam. The rods were still the old reliable cam squirters from the 283. The 350 horse used the 151 hydraulic cam. All of the higher horse engines used a Holley 600 on an aluminum intake manifold except FI was used on the 360 and 375 horse engines. The 340 used a Carter AFB carb on an aluminum intake.

I do not think I missed any of the important details. Depending on the application , car, trans etc. there were definitely carburetor variations (Carters, Rochester, and Holley that were used.

This information is being passed along based on my recollections of building many SBC throughout the years. Many of the parts do interchange between these two engines, this is why I have loved working with them since 1963.

I hope this info helps to better understand the two powerplants.
Bill
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  #24  
Old Jun 15th, 08, 04:49 PM
JohnZ JohnZ is offline
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Default Re: how to increase horsepower with 327

I'm not that familiar with the passenger car engines, but Corvette engines dressed out a little differently, as follows:

Cams:

'57-'61 283 and '62-'66 327 base engines used the same 3733431 hydraulic cam, replaced in '67 by the "929", which had a little less intake lift, more exhaust lift, and 10* more intake duration and 20* more exhaust duration - it remained the standard cam through 1979.

The 283's and 327's through 1963 with solid lifters all used the "097" Duntov; it was replaced in '64-'65 by the "30-30" ("346") cam, later used again in the '67-'69 Z/28. 1965 was the last year for solid-lifter cams in small-blocks except for the '70-'72 LT-1's, which used the "178" cam.

The "151" performance hydraulic cam was introduced in 327's in '65 (the L-79), and remained through 1968.

Carburetors:

Carter WCFB's were used on all Corvettes through 1961 (both 1x4 and 2x4), and from '62-'65 were used only on the base 250hp engine, then disappeared.

Carter AFB's were introduced in '62 on the 327/300 and 340, continued in '63, and were used only on the 327/300 in '64-'65, then disappeared.

The Holley 2818 (4150 - 585CFM) was introduced in '64 on the 327/365, and continued in '65 on the 327/350 and 327/365. It was replaced in '66 by the 3367 (4160 - 585CFM) on the base 300hp and L-79 350hp engines, and was replaced in '67 by the 3810 (4160-585CFM) on the base 300hp and L-79 350hp engines. 1967 was the last year for a Holley on a small-block except for the '70-'72 LT-1 350.

Q-Jets weren't used on Corvettes until 1968.


Cranks:

All 265, 283, and 327 engines used forged steel cranks; solid-lifter 327 cranks were Tufftrided for wear resistance.

Rods:

Rods were improved in late '66 by adding more meat adjacent to the underside of the bolt head, which showed as a "bump" after machining.

Heads:

All Corvette heads through 1959 (and 250hp engines through 1965) had 1.72/1.50 valves. Starting in '61, the 461 heads on optional engines had 1.94/1.50 valves; the 2.02/1.60 valves didn't show up until 1964, on 350/365/375hp engines through '65. The 462 heads used in '66-'67 and the 291 heads used in '67-'68 used 1.94/1.5 valves on 300hp engines, and used 2.02/1.60 valves on 350hp engines.

Trivia: There was never a 315hp 283 fuelie, although they were advertised as such; the aluminum heads that increased power over the 290hp fuelie never went into production, although the 315hp rating appeared in early brochures, and the "CS"-coded 290hp engines with iron heads were used in '60-'61.

That about covers Corvette usages; if I missed something, just ask.

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  #25  
Old Jun 16th, 08, 03:46 AM
pdq67 pdq67 is offline
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Default Re: how to increase horsepower with 327

Thanks John and I got your PM!!

pdq67
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  #26  
Old Jun 19th, 08, 08:31 AM
lightn 68 lightn 68 is offline
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Default Re: how to increase horsepower with 327

If your looing for a good 383 crate motor, you might consider looking at M&R Engines out of Glendale, CA. I just purchased a short block 383 I am putting together for my 68. The short block with comp cams hydraulic roller 282hr cam with forged components and timing chain was $2500 delivered to Oklahoma!! I also found Matt very informative and easy to work with!

Tim
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  #27  
Old Jun 29th, 08, 07:27 AM
ChuckB ChuckB is offline

 
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Default Re: how to increase horsepower with 327

Quote:
Originally Posted by FRANK ESKRA View Post
Further education......The 327/300hp had a hyd. lifter cam and a BIGGER PORT size cast iron intake with a C Series Carter AFB. It had the 461 head that had 1.093 intake valve with a 1.500 exhaust valve and a 64 cc head. Compression was up just a little over the 250 hp version as well.
Does anyone know the casting number of this intake manifold or where to find one?

Thanks
Chuck
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  #28  
Old Jun 29th, 08, 09:29 AM
pdq67 pdq67 is offline
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Default Re: how to increase horsepower with 327

Please do a search under my handle b/c I have posted the 300hp/327 AFB intake's PN that I have up on my shelf in the garage.

pdq67
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  #29  
Old Jul 19th, 08, 08:30 AM
Norcoastal Norcoastal is offline
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Default Re: how to increase horsepower with 327

I have a 1965 327 with 275 HP, casting number F070IHC.

I believe this came from a full size car.

Can anyone tell me more about this engine? I tried looking up the numbers but all I could find out was that it was 275HP.

Is this a good base engine? What heads came with this engine? 2 bolt main caps?
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  #30  
Old Jul 19th, 08, 09:40 AM
pdq67 pdq67 is offline
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Default Re: how to increase horsepower with 327

We forgot that the 302 Z-28 uses the 30-30, (-346), solid lifter cam too.

I just went out in the garage and got the part number off my cast-iron 327 AFB intake so here it is --- PN 3844459.

I figure the 300hp/327 is the best square-bore cast-iron SB intake made up to the spread-bore Q-Jet.

And of course, it can't compare to the newer marine cast-iron copy of the Z-28 intake that I think can take both style carb's(?), but that sucker is PRICEY by me!! GM's really proud of it!!

pdq67
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