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rnix999 12-27-2009 02:53 PM

327 build help
 
Hi,
I'm looking at rebuilding a 327 and could use some help on part selection, the car is as following:

CAR:
1965 Corvette (to far gone from original to go that restoration route)
M21 4 speed
4:11 12 bolt posi rear end
Weight 3200#

Engine:
327 l79
original block .030 over
heads double hump with 1.94 valves (not original or correct)
2.5 in ram horn exhaust manifolds
zz4 intake
eldebrock 600 cfm carb

Goals:
weekend driver, no racing intentions, I'm more interested in driving winding roads but would like some off the line performance.
325-350 hp
350 minimum torque (I do understand that this is a 327 and not a 383)
$ 2500 to $ 3000 budget (hopefully including machine work)

Intend to keep:
Block
crank
Rods (if feasible)
carb
intake
2.5 in ram horn manifolds

Intend to replace:
Cam
heads
pistons
and other required items for a rebuild

I am pretty set on keeping this block as long as it checks outs and would like recommendations for heads and cam replacement. I am willing to consider aluminum or cast iron heads, weight is not a real concern to me, also what kind of intake flow values should i be looking at for the heads? (I have looked though previous posts and have a basic understanding of high vs low flowing heads, so thinking on the lower end, just not quite sure what target should be.)
I plan on lowering the compression of the engine to be pump gas friendly (91 max octane in California). I'm assuming that this would be accomplished through different pistons. (present pistons are the 11:1 comp. l79 327 sbc). If my goals are unrealistic please let me know and your help is appreciated.

chris.1954 01-03-2010 11:21 AM

327 build
 
i to am doing a 327.useing 10.5 trw pistons and a melling mtc-1 cam,1500-4500 rpm range,thinking of useing tbi heads because of unleaded gas.my friend who is very experianced at engine building says they work great.i have an 82 cutlas calaise with air ,cruise etc

Rickracer 01-03-2010 12:14 PM

I think if I were in your shoes, I'd do some Vortec heads and probably a Vortec Performer intake, with flat top pistons: 9.7 to 10.5 compression (depending on deck height and specific piston part number), will run on on pump gas, GREAT lower end torque and hp on up to 5500 rpm, (slightly more or less, depending on intake and cam choice). :cool:

automotive breath 01-03-2010 12:43 PM

Swap out the rods with the scat small journal I beam rods.

Properly prepared vortec heads would work well or there are plenty of
aftermarket choices. Runner and chamber volume are critical. Intake runner
volume in the 170 - 180 cc range. Set up the piston to head clearance near
0.040", use combustion chamber volume to achieve the desired compression
ratio.

Camshaft selection will depend on the intended RPM range.

ap72 01-03-2010 01:11 PM

i'd sell what you have and buy a complete vortec 350 to rebuild. it'll be cheaper make more power and last longer. you can get over 400 ftlbs out of that for half the cost of your 327. if you're not worried about numbers matching its the best bang for the buck.

my87Z 01-03-2010 01:22 PM

i agree with everyone here, vortecs or i prefer aftermarket vortec style heads, especially the RHS 170 pro torkers, they out perform the origianal vortecs and are not prone to cracking like the original vortecs. the intake would have to be vortec compatable, they are close to the same price as regular style intakes. however i wouldn't go with flat top pistons as with a 64-65cc combustion chamber would give you a low to mid 10:1 CR i would likely try to stay closer to 9.5:1 for a only street vehicle.

making 325-350hp out of a 327 will be easy due to the fact that 327's like RPM's 350tq is still very possible.

as far as head flow i would look for a head that flows 240+@ .500" lift and has a good consistante increase from .300" lift up, stock vortecs will fall slightly short of this but not by much, but the RHS 170 heads will be right on the money

ap72 01-03-2010 01:41 PM

:pain:
Quote:

Originally Posted by my87Z
i agree with everyone here, vortecs or i prefer aftermarket vortec style heads, especially the RHS 170 pro torkers, they out perform the origianal vortecs and are not prone to cracking like the original vortecs. the intake would have to be vortec compatable, they are close to the same price as regular style intakes. however i wouldn't go with flat top pistons as with a 64-65cc combustion chamber would give you a low to mid 10:1 CR i would likely try to stay closer to 9.5:1 for a only street vehicle.

making 325-350hp out of a 327 will be easy due to the fact that 327's like RPM's 350tq is still very possible.

as far as head flow i would look for a head that flows 240+@ .500" lift and has a good consistante increase from .300" lift up, stock vortecs will fall slightly short of this but not by much, but the RHS 170 heads will be right on the money

comparing apples to shoes...

automotive breath 01-03-2010 02:14 PM

my87Z is right about the flow numbers, 240@ 0.500" would make great power
at the top of the RPM range of the 327. Accomplish this with a small port
volume to assure good port velocity. These engines are fun to drive with the
light weight steel crank they love RPM. With mine I run a solid lifter flat
tappet cam and let it spin.


Quote:

Originally Posted by my87Z
...as far as head flow i would look for a head that flows 240+@ .500" lift


Hippie 01-03-2010 02:28 PM

Quote:

Originally Posted by rnix999
Goals:
weekend driver, no racing intentions, I'm more interested in driving winding roads but would like some off the line performance.
325-350 hp
350 minimum torque (I do understand that this is a 327 and not a 383)
$ 2500 to $ 3000 budget (hopefully including machine work)

I am pretty set on keeping this block as long as it checks outs and would like recommendations for heads and cam replacement. I plan on lowering the compression of the engine to be pump gas friendly (91 max octane in California). If my goals are unrealistic please let me know and your help is appreciated.

If the car is beyond restoring then what's the big attraction of keeping that engine in it? What you've described is the GM 350 HO crate motor. 330HP @ 5000 RPM and 380 Ft.Lbs. @ 3800, 9.1 to 1 compression, hydraulic cam, Vortec heads and aluminum intake for about $2800.00. Put the 327 under the bench for "someday", drop a 350 HO in it and go. Just my $.02.

my87Z 01-03-2010 05:20 PM

Quote:

Originally Posted by ap72
:pain:
comparing apples to shoes...


What? AP i do appriciate your knowlege and critisisim but do explain further please. what info was i wrong with? :rolleyes:

Hippie 01-03-2010 05:56 PM

OK, here's a combo that keeps your 327 block.

.030" over for a classic 331cid. with flat top pistons with 5cc valve reliefs, Vortec heads, Performer RPM, Comp 268HE cam, a 600cfm carb with small tube headers. On DD2000 it makes "roughly" 374FWHP @ 5500 and 391FWTQ @ 4500. Good low end TQ and compression is 9.5 to 1, DCR about 7.6 so it should run on 89 Octane, 91 no sweat. In a light car with a 4 speed and 4.11's it would be an absolute blast and have a bit of a "racy" idle but decent manners.

You'll have to get a different intake but you won't have any trouble selling the ZZ4 intake.

Rickracer 01-03-2010 05:57 PM

:thumbup: Good combo, :thumbup:

Hippie 01-03-2010 06:03 PM

Quote:

Originally Posted by Rickracer
:thumbup: Good combo, :thumbup:


Once I replaced that 600 cfm "crab" with a carb....... :eek:

Rickracer 01-03-2010 06:41 PM

I knew what you meant, my fingers get a little dyslexic sometimes too, :D

automotive breath 01-03-2010 07:00 PM

Quote:

Originally Posted by Hippie

.030" over for a classic 331cid. with flat top pistons with 5cc valve reliefs,
Vortec heads, Performer RPM, Comp 268HE cam, a 600cfm carb with small
tube headers.

I'm thinking more along the lines of porting the Vortec heads, a Comp XS274S
cam. Same flat top pistons with a smaller combustion chamber for a little
more compression. Weiand single plane with a 750 double pumper. Up grade
the connecting rods and swap the 4:11's for a 4.56 and spin it to 7200. Now
we are talking fun to drive.


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