We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Mild performance build of my original 327 for my 1964 Corvette

General engine tech -- Drag Racing to Circle Track

Moderator: Team

PRH
Expert
Expert
Posts: 769
Joined: Fri Sep 08, 2017 4:16 pm
Location: S. Burlington, Vt.

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by PRH » Sat Jul 06, 2019 3:48 pm

You can virtually bolt together a pump gas 500 hp 500 tq 383 with the parts available today.
Very easily....... and you can still get there even if you end up using parts that aren’t optimum.

Even a cave man can do it.
Somewhat handy with a die grinder.

bosco
Member
Member
Posts: 64
Joined: Sat Jun 01, 2013 7:41 am
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by bosco » Sat Jul 06, 2019 10:36 pm

Thanks to all for the input, interesting to say the least. For now, I am just gonna tune on the 383 a little and just keep the numbers matching 327 untouched.

In 1970 I did a similar build to what I was gonna do to the 327 on a 350/300 in my Indy Pace Car (1969). I had the heads ported by someone who did work for Bo Laws at one time, installed a 350 HP cam with port matched C3BX and a 650 Holley. It had Hooker long tubes and 3.73 gears. With this mild build it went 13.31 at 106 through the mufflers on the old polyglas Goodyears. I thought, pretty good for the day. I thought I would recreate something similar and maybe better, but will take some time and play with the 383.

One little note of interest, when I bought the car the first time the previous owner told me the hard top came from Oakland Raiders quarterback Kenny "Snake" Stabler. Around 1989 I met Stabler in Orlando and he confirmed it was his and he had done the roll and pleated headliner himself.

Again, thanks to you all for the stories and insight.
"Bosco"

Ericnova
Member
Member
Posts: 167
Joined: Tue Jan 01, 2008 2:56 am
Location: Southern Michigan

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by Ericnova » Sat Jul 06, 2019 10:55 pm

RevTheory wrote:
Sat Jul 06, 2019 1:58 pm
Carnut1 wrote:
Sat Jul 06, 2019 12:40 pm
RevTheory wrote:
Sat Jul 06, 2019 12:35 pm
If that's numbers-matching engine, I wouldn't touch it for the world. At least not be subjecting to any abuse.
Oh Rev. I would run the snot out of it.
You're asking for a lantern and pitchfork mob if you destroy a numbers-matching 327 for a split-window 'vette when you've got a sacrificial 383 sitting right there :cry:
Seeing that it is a '64, and a roadster,..... it will be a while before the lynch mob gets around to him... :lol: :lol:

Still foolish to risk the numbers matching engine though, chops 15-20% right off the collector value if you don't have it tucked away safe.

vortecpro
Guru
Guru
Posts: 1161
Joined: Fri Apr 24, 2009 11:10 pm
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by vortecpro » Sun Jul 07, 2019 7:51 am

bosco wrote:
Sat Jul 06, 2019 10:07 am
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.
Last edited by vortecpro on Sun Jul 07, 2019 8:14 am, edited 5 times in total.
Racing a NA NHRA stocker should be mandatory before any posting.

Carnut1
Guru
Guru
Posts: 4554
Joined: Tue Jun 11, 2013 6:32 pm
Location: Melbourne fl.

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by Carnut1 » Sun Jul 07, 2019 7:57 am

Nice builds Mark, good to see how much power can be made with the cfm you have available. Glad you are back on ST!
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST

vortecpro
Guru
Guru
Posts: 1161
Joined: Fri Apr 24, 2009 11:10 pm
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by vortecpro » Sun Jul 07, 2019 8:04 am

Thanks-nice to be back, I had trouble logging in :shock:
Racing a NA NHRA stocker should be mandatory before any posting.

bosco
Member
Member
Posts: 64
Joined: Sat Jun 01, 2013 7:41 am
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by bosco » Sun Jul 07, 2019 8:29 am

Wow, number 2 is really bad ass !

chevyfreak
Pro
Pro
Posts: 349
Joined: Sat Oct 04, 2014 4:23 am
Location: south africa johannesburg

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by chevyfreak » Sun Jul 07, 2019 9:06 am

All this talk about 327s just made me decide i will have to build another one. :D . Been following this thread as i am a 327 admirer.

Just love that no.2 327 .
Thanks for sharing vortecpro.

Chevyfreak.
Bowtie for life

RevTheory
HotPass
HotPass
Posts: 5328
Joined: Thu Sep 04, 2014 6:45 am
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by RevTheory » Sun Jul 07, 2019 9:12 am

Ericnova wrote:
Sat Jul 06, 2019 10:55 pm
Seeing that it is a '64, and a roadster,..... it will be a while before the lynch mob gets around to him... :lol: :lol:

Still foolish to risk the numbers matching engine though, chops 15-20% right off the collector value if you don't have it tucked away safe.
Yeah, oops :? I saw the nose of the car and instantly channeled my buddy who's been carrying on about a '63 split for 25 years. By the time his possession left, it was too late to edit, lol.

vortecpro
Guru
Guru
Posts: 1161
Joined: Fri Apr 24, 2009 11:10 pm
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by vortecpro » Sun Jul 07, 2019 9:21 am

chevyfreak wrote:
Sun Jul 07, 2019 9:06 am
All this talk about 327s just made me decide i will have to build another one. :D . Been following this thread as i am a 327 admirer.

Just love that no.2 327 .
Thanks for sharing vortecpro.

Chevyfreak.
One Sunday we were looking for some nice small journal 327s on Craigslist, to build a 302 for my son, he really likes Z/28s. We ended up with some very nice virgin cores, I couldn't see letting these extra 327 cores go to waste, infact I wasn't going to just store them so we built them. My sons 302 build. https://classracer.com/classforum/showt ... hp?t=70688
Last edited by vortecpro on Sun Jul 07, 2019 9:35 am, edited 2 times in total.
Racing a NA NHRA stocker should be mandatory before any posting.

bosco
Member
Member
Posts: 64
Joined: Sat Jun 01, 2013 7:41 am
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by bosco » Sun Jul 07, 2019 9:22 am

chevyfreak wrote:
Sun Jul 07, 2019 9:06 am
All this talk about 327s just made me decide i will have to build another one. :D . Been following this thread as i am a 327 admirer.

Just love that no.2 327 .
Thanks for sharing vortecpro.

Chevyfreak.
I have one in my SCCA road race 1968 Corvette, well sorta, it is a 4.155 bore x 3.0 crank to make about 326 ci. It turns 8000 plus and hits 180 in the trioval at Daytona and 160 down the back at Sebring.



Carnut1
Guru
Guru
Posts: 4554
Joined: Tue Jun 11, 2013 6:32 pm
Location: Melbourne fl.

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by Carnut1 » Sun Jul 07, 2019 9:31 am

I really like how Mark builds hard running engines with parts others dismiss.
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST

chevyfreak
Pro
Pro
Posts: 349
Joined: Sat Oct 04, 2014 4:23 am
Location: south africa johannesburg

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by chevyfreak » Sun Jul 07, 2019 10:10 am

[quote=vortecpro post_id=815970 time=1562505674

One Sunday we were looking for some nice small journal 327s on Craigslist, to build a 302 for my son, he really likes Z/28s. We ended up with some very nice virgin cores, I couldn't see letting these extra 327 cores go to waste, infact I wasn't going to just store them so we built them. My sons 302 build. https://classracer.com/classforum/showt ... hp?t=70688
[/quote]

Both of mine is large journal. One waiting to be built (well not waiting anymore :D )
bosco wrote:
Sun Jul 07, 2019 9:22 am
I have one in my SCCA road race 1968 Corvette, well sorta, it is a 4.155 bore x 3.0 crank to make about 326 ci. It turns 8000 plus and hits 180 in the trioval at Daytona and 160 down the back at Sebring.
Just love stuff like this. Big bore short stroke combinations. :D
I have a similar build i wanna do someday. 400 block with 327 crank. Basically the old w348 combo in a sbc package.

Chevyfreak.
Bowtie for life

bosco
Member
Member
Posts: 64
Joined: Sat Jun 01, 2013 7:41 am
Location:

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by bosco » Sun Jul 07, 2019 10:24 am

chevyfreak wrote:
Sun Jul 07, 2019 10:10 am
[quote=vortecpro post_id=815970 time=1562505674

One Sunday we were looking for some nice small journal 327s on Craigslist, to build a 302 for my son, he really likes Z/28s. We ended up with some very nice virgin cores, I couldn't see letting these extra 327 cores go to waste, infact I wasn't going to just store them so we built them. My sons 302 build. https://classracer.com/classforum/showt ... hp?t=70688
Both of mine is large journal. One waiting to be built (well not waiting anymore :D )
bosco wrote:
Sun Jul 07, 2019 9:22 am
I have one in my SCCA road race 1968 Corvette, well sorta, it is a 4.155 bore x 3.0 crank to make about 326 ci. It turns 8000 plus and hits 180 in the trioval at Daytona and 160 down the back at Sebring.
Just love stuff like this. Big bore short stroke combinations. :D
I have a similar build i wanna do someday. 400 block with 327 crank. Basically the old w348 combo in a sbc package.

Chevyfreak.
[/quote]
Love it, I thought about putting a 3.48 crank in the race car block to make a 377, but my driver begged me not to, he just loves the big bore, short stroke motor.

cardo0
Member
Member
Posts: 161
Joined: Fri Mar 30, 2018 9:36 pm
Location: Las Vegas

Re: Mild performance build of my original 327 for my 1964 Corvette

Post by cardo0 » Sun Jul 07, 2019 12:23 pm

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!
74 corvette: 350 4 speed
94 Z28: Gen II 350 auto

Post Reply