Mild performance build of my original 327 for my 1964 Corvette

[bosco]

Just my opinion but my expectation is while cubic inches are lower for a shorter stroke the hp/ci goes up. Maybe not in proportion but a shorter stroke on the same bore can allow a flatter piston with a smaller head chamber for greater efficiency.

The SCCA Trans-Am series in the 90's used 310" motors making over 600hp using domed pistons and 13:1 compression. Myself I don't see any need for over 500hp in a street car. And reduced torque increases the life of the trans + rear end I would think.

But on the other hand I don't read much about big-bore short stroke motors. A little published on the 4.155" X 3.25" = 350ci combo but this is first time I read of the 4.155" X 3.00" = 326ci combo. I am interested as I have 3 standard bore 400 blocks waiting their turn. Interested in what size cam for something like a 4.155" X 3.00" combo? How much lift do your really need for a shorter stroke motor? "That science is beyond me but would like to hear about it from others with that experience. And to stay on topic here how much lift does a 3.25" stroke sbc need? Meaning is lift over 0.55" gaining anything on a short stroke motor?

Lets hear it!

or

The race motor, 4.155 x 3.0 I am quite sure has over .600 lift and a lot of duration, but will have check the cam card this week.
It has Dart block Little M, Callies magnum crank, Carillow rods and JE pistons if I remember correctly. The heads are old Brodix -8, pro ported, Brodix intake with Bo Laws 750 carb. Solid roller comp cam. It made about 520 HP and 410 torque. The car is a tube frame 1968 Corvette and weighs about 2600 with lead and driver. Performance is similar to the Trans Am 2 cars.

[GARY C]

I do know that even a mismatched 306 responds well to nitrous, the single time slip is leaving on a 150 shot and then bringing in another 150 4 tenths out.

[F-BIRD'88]

If you want big reliable power and torque from a mild tame natured 327 you can get that by supercharging it.
You can even use factory 327 hi perf corvette exhaust manifolds and the oem 327-350 hp "151" camshaft.
Consider using aTorqStorm supercharger.
Moderate 5-6 psi boost. Build the 327 with lower than stock factory compression ratio for boosted reliable power on pump gas. 8.5-9:1 cr.

A easy build using KB -13 cc D Dish pistons
And your 64 cc heads.
Heads can benefit with moderate porting.
Not nessessary to max them. out.
Look here
Www.torqstorm.com

Another very nice well manored supercharger friendly camshaft for this 327 is Crane HMV-278-2
#113801 can use 1.6/1.5 rocker set for benefit too.

[falcongeorge]

I have a nice 1964 Corvette roadster with a stout 383 stroker with old Trick Flow 23 degree heads. It makes about 425 HP and similar torque. I have the original 327/300 motor with 461 heads available. I would like to put the 327 back in with a few upgrades: Comp Cams 350 HP Nostalgia plus cam, L79 Aluminum intake, Bo Laws 650 or 750 Holley and maybe some mild porting on the heads. It has Hooker shorty headers into the sidepipes.


I want the original motor back in the car but without too much drop off in performance. Would the 327 at about 10.5 compression, and with the above mentioned upgrades approach 400 HP and say 375 torque?

The car looks near stock with the exception of 65 sidepipes, American 200 S Wheels. It does have Wilwood 4 wheel discs, and the F41 suspension. It handles and stops far better than original and I am not concerned about making it some 99 point show car, and will never sell it. Just kinda would like to say it has the original 327...BUT I NEED MORE SMOKE.

Thanks for you ideas and opinions

I built two 327s recently:

1. 9.7 compression, .060 over 462 heads, 218 CFM @ .460 lift, Isky 270 Mega cam Summit dual plane intake, 770 Avenger. 363 HP @ 5900 RPM, 362 TQ
2. 11.1 compression, .030 over, 462 heads 242 CFM @ .500, Isky 240/.480/108 solid lifter, Performer RPM intake, 750 BP, 1 inch open spacer. 444 HP @ 6600 RPM 398 TQ.

Both engines were small journal 327s. The # 2 327 ran 13.80s @ 100 MPH in a 1979 C-10 truck with a 3.07 gear and 30 inch tall tires in Colorado's 8000 DA conditions, 24,98 baro.

1. 327.
2.

#2 is almost a twin to the motor I have in my chevy II, except its large journal, hyd cam in mine, Isky 280 hyd, but with 1.6 intake rockers, intake is a modified Team G Power- ram single plane ( this is the low-rise "street version" with blocked heat risers, runner dividers extended and ball-nosed, and the runners enlarged a bit) and a Q-jet. Heads are virtually identical, #462's mine flowed 245@.500, head bolt sleeves and the cyl. wall side of the intake port is straightened all the way in. Mine also has fenderwell headers, which are probably good for some hp. Never dynoed it, but it will wax my S10, that ran 12.0s with a 350 with RPM heads. S10 was just over 3400 with me it, this ones just under 3200 with me in it. I was guesstimating it probably makes around 410-415, probably pretty close. 4.10s, 200-4r with a 9.5" 190K lock-up converter
Yea, 327s are stones, you shouldn't even consider building them they are a waste of time. As a public service, gather up any you have, and send them to me, and I will dispose of them in a safe and environmentally friendly manner. Its the least I can do.

[falcongeorge]

[imghttps://www.facebook.com/photo.php?fbid=1021880 ... =3&theater][/img]

I owned her from 1988-2001 and sold her to my best buddy. He passed recently and I just bought her back from his estate.

oh man, '65-'67 chambered sidepipes and 200S's to boot. Lust, drool, slobber...

[pdq67]

I might have missed it, but what are the reg's?

And the tranny again?

Anyway a 4-speed and decent reg's at 10.5 to 1 CR in a good 331 will run like a scalded dog with just a good old Isky Z-25 solid lifter cam.

It might even give the 383 a run for the money?

You get her up to 11 to 1 CR and drop a Z-30 solid cam in her and GO have more fun than John Law will allow!!

pdq67

[PackardV8]

Anyway a 4-speed and decent reg's at 10.5 to 1 CR in a good 331 will run like a scalded dog with just a good old Isky Z-25 solid lifter cam.

It might even give the 383 a run for the money?

pdq67

The older we get, the faster they wuz. Just never offer to go for pinks. A good 331" will get hammered by a good 383" every day in every way.

[pdq67]

Well then ta hell with a 383, put a 177 blower on the 331 and go!!

Probably even on a 306!!

He, He!!

pdq67