1969 L-36 390HP 427 CPMotorworks 2019 - Page 3 - Chevelle Tech
Performance Our High Performance area

 75Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #31 of 66 (permalink) Old Aug 29th, 19, 11:26 PM
Boldly procrastrinating
Tom Terrific II
 
Join Date: Oct 1998
Location: Glendale, Az
Posts: 28,291
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Gene, your new Q will have APT. You'll need a WBO2 to do much of anything with it. make sure you get sensor bungs in the headers while they're out.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
Tom Mobley is offline  
Sponsored Links
Advertisement
 
post #32 of 66 (permalink) Old Aug 30th, 19, 4:32 AM
Tech Team
Dave
 
Join Date: Sep 2013
Location: OH IO
Posts: 607
Re: 1969 L-36 390HP 427 CPMotorworks 2019

How does the low rise cast iron intake compare to the aluminum low rise intake. Besides the obvious weight difference. Just curious.
25C 70 is offline  
post #33 of 66 (permalink) Old Aug 30th, 19, 7:50 AM
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 14,391
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by Tom Mobley View Post
Gene, your new Q will have APT. You'll need a WBO2 to do much of anything with it. make sure you get sensor bungs in the headers while they're out.
Tommy, I'm not planning on drilling holes in my new white headers. No sensor bungs.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
 
post #34 of 66 (permalink) Old Aug 30th, 19, 8:46 AM
Lifetime Premium Member
Beth
 
Join Date: Oct 2010
Location: Nashville TN
Posts: 1,648
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by Tom Mobley View Post
I can do Q's like that for $250 if the customer can pass on the new cad plating. I don't have a handy place to set up a cad plating deal. That stuff is poisonous, heavy metal components. Exposure is cumulative.
You're hired.

So where do we get a core ? I assume I need a post-1972 800 cfm model.

Just imagine the billing : Wolfplace engine and Mobley Q-Jet

That will strike fear in them LOL
427L88 likes this.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
nashville beth is offline  
post #35 of 66 (permalink) Old Aug 30th, 19, 9:44 AM
Senior Tech Team
Eric
 
Join Date: Jan 2006
Location: SW Ohio
Posts: 1,283
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by 427L88 View Post
Tommy, I'm not planning on drilling holes in my new white headers. No sensor bungs.
You could put them in the collector reducers.
WHT/73 likes this.

Carburetor Rebuild & Restoration
Engine & Driveline Parts & Services

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Check out
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
on Facebook
Vintage Musclecar is online now  
post #36 of 66 (permalink) Old Aug 30th, 19, 1:23 PM
p40
Tech Team
butch
 
Join Date: Nov 2015
Location: indiana
Posts: 692
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

i should be around 425hp, i have just about the same build but have the isky z33 cam and victor jr and 750 dp l2300 pistons and the small chamber 97 cc heads
427L88 and badrad like this.
p40 is offline  
post #37 of 66 (permalink) Old Aug 30th, 19, 3:56 PM
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 14,391
Re: 1969 L-36 390HP 427 CPMotorworks 2019

hope Pete doesnt mind our Qjetted hijack here.....

Tom, I was *just* about to send Beth a PM , and tell her to maybe PM u to ask you to build her one, as "cheesy" as that may have seemed, I didnt want to volunteer you publicly. So THNX for offering ! before it got CHEESY.

I'm sure Murphy carbs are every well done as well. Pete has said so.

And Beth, Gentlemen DO prefer BOWTIES! I tis a little less cheesy when top coated with orange, so I do hear ya. I'll refrain from highlighting tha bowtie in black or polished alum.


GREAT BUILD PETE! and glad to see the Qjet is still alive and well.....!

Butch, your engine should pull well in the upper rpm range. I hope you get more than you bargained for !
CPMotorworks and p40 like this.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #38 of 66 (permalink) Old Aug 30th, 19, 6:33 PM
Lifetime Premium Member
Beth
 
Join Date: Oct 2010
Location: Nashville TN
Posts: 1,648
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by 427L88 View Post
hope Pete doesnt mind our Qjetted hijack here.....

Tom, I was *just* about to send Beth a PM , and tell her to maybe PM u to ask you to build her one, as "cheesy" as that may have seemed, I didnt want to volunteer you publicly. So THNX for offering ! before it got CHEESY.

I'm sure Murphy carbs are every well done as well. Pete has said so.

And Beth, Gentlemen DO prefer BOWTIES! I tis a little less cheesy when top coated with orange, so I do hear ya. I'll refrain from highlighting tha bowtie in black or polished alum.


GREAT BUILD PETE! and glad to see the Qjet is still alive and well.....!

Butch, your engine should pull well in the upper rpm range. I hope you get more than you bargained for !
Gene,

I just don't like the "bowties" on the intakes because it's a dead giveaway that it's not old. Gotta have that 60's look y'know?

Well I have been ed-g-cating myself on q-jet trivia (this thread has been q-jet hijacked LOL)

I think the best cores to rebuild are 1976-1978 which are all 800 cfm.

I found one on facebook marketplace that a guy says he just pulled off a good-running 78 vette smallblock. It looks like it's unmodified and hopefully never rebuilt.

If I don't get this one I'll keep looking for something like it 76-78.

Those years have an external adjustment for tuning that's very desirable.
von, 427L88 and Pat_McNeil like this.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
nashville beth is offline  
post #39 of 66 (permalink) Old Aug 30th, 19, 10:33 PM
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 14,391
Re: 1969 L-36 390HP 427 CPMotorworks 2019

OK you "snowflake" lover!

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #40 of 66 (permalink) Old Aug 31st, 19, 1:58 AM
Moderator
Levon
 
Join Date: Jul 1999
Location: Priddis, Ab. Canada
Posts: 9,282
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Any reason to not consider the Corvette 3947801 or equiv aluminum Qjet manifold? Other than the "cost" .

Levon Hovagimian
Team Chevelle #279
2015 Camaro ZL1 Summit White (Bone Stock)
70 Chevelle SS 454 LS5 4 speed. SOLD
Current Engine VortecPro 460 (513 HP) Original is resting
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1966 427 Corvette SOLD
1973 Camaro IHRA Hot Rod (LS-6 Auto)11.00 @121 (Chased a 10.99 or better) SOLD

Priddis Greens, Ab. Canada


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
LevonH is offline  
post #41 of 66 (permalink) Old Aug 31st, 19, 6:44 AM
Senior Tech Team
Joe
 
Join Date: Nov 2003
Location: Thornton, Pa
Posts: 13,284
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by nashville beth View Post
Gene,

I just don't like the "bowties" on the intakes because it's a dead giveaway that it's not old. Gotta have that 60's look y'know?

Well I have been ed-g-cating myself on q-jet trivia (this thread has been q-jet hijacked LOL)

I think the best cores to rebuild are 1976-1978 which are all 800 cfm.

I found one on facebook marketplace that a guy says he just pulled off a good-running 78 vette smallblock. It looks like it's unmodified and hopefully never rebuilt.

If I don't get this one I'll keep looking for something like it 76-78.

Those years have an external adjustment for tuning that's very desirable.
Painted to match the engine, 90%+ people won't know the intake is not vintage. Especially if you use a Qjet and a stock style air cleaner.

Status: Car-Less


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
GRN69CHV is offline  
post #42 of 66 (permalink) Old Aug 31st, 19, 8:45 AM
Lifetime Premium Member
Beth
 
Join Date: Oct 2010
Location: Nashville TN
Posts: 1,648
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by LevonH View Post
Any reason to not consider the Corvette 3947801 or equiv aluminum Qjet manifold? Other than the "cost" .
Well, they are over $500.

Plus the 67 cast-iron q-jet manifold is original for 396/325 hp and flows a little better - it's a high-rise design.

And costs $50.
shovelrick likes this.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
nashville beth is offline  
post #43 of 66 (permalink) Old Aug 31st, 19, 8:52 AM
Lifetime Premium Member
Beth
 
Join Date: Oct 2010
Location: Nashville TN
Posts: 1,648
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by GRN69CHV View Post
Painted to match the engine, 90%+ people won't know the intake is not vintage. Especially if you use a Qjet and a stock style air cleaner.
I could paint my performer rpm orange. After grinding off edelbrock's CHEESY "made in america" flag. :-)

Not that our flag is cheesy. It just doesn't belong on an intake manifold

But I think I will have two nice setups for fuel delivery: I already have a "takeoff" Holley 850 vacuum secondary that is from a ZZ502. That will go on the performer rpm. I can use that when I go to the track.

Then my street setup will be the q-jet and stock 67 hi-rise intake.

It will be fun seeing if the q-jet can come close to the big Holley in qtr mile times.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
nashville beth is offline  
post #44 of 66 (permalink) Old Aug 31st, 19, 7:03 PM Thread Starter
Tech Team
Pete
 
Join Date: Aug 2012
Location: Janesville Wi
Posts: 418
Garage
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by ShouldntBeHere View Post
Wow! KILLER power from such a mild build with stock-ish parts. Did you dyno it with headers or manifolds?

Your build made considerably more power then our stock-ish rebuild of a L78 with a 235/241* hyd roller...and stock square port heads.....We dynoed with vette manifolds and unfortunately a 650DP carb (thought it was a 750) and Iíve always been a little disappointed with the numbers... (441hp/435tq SAE).

I see guys like you and Mark doing these factory builds nailing 500 hp and Iím like


Nice work man!
Thanks Alan- Based off of the testing I've done and posted here, the L-36 427/496 lost 62hp iirc from 2" headers to Corvette manifolds at the 582hp level, and the 427 L-71 lost 32hp with manifolds at the 532hp level. I would venture 25-30hp would be had on yours with headers vs manifolds.
The owner of the dyno had just finished a L-78 for a 1970 Chevelle, and it made 475hp with 220's/230's HR cam I believe.

Quote:
Originally Posted by nashville beth View Post
Looks like this is the carb for me; the hi-rise 67 cast-iron intake with this carb should be a killer sleeper combo.

https://www.smicarburetor.com/produc.../productID/849

Part Number:
335025

Product Name:
Rochester 4BBL Quadrajet 800CFM

Description:
SMI - STAGE TWO - (800 CFM) ROCHESTER QUADRAJET
For use with Aftermarket Headers, Cams and Intakes.
That is what Sean sent for this L-36 project.

Quote:
Originally Posted by 25C 70 View Post
How does the low rise cast iron intake compare to the aluminum low rise intake. Besides the obvious weight difference. Just curious.
I haven't built an engine using the low rise iron intake yet, although I did purchase a complete '71 LS5 last fall I have considered building, but would prefer to sell to someone that needs it. Maybe I'll be able to build and test it for whoever may buy it if I don't do it first.

CP Motorworks,Inc

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Custom Performance Engines &
Cylinder Head Fixtures for Vertical Mills and Surfacing Machines

1971 Chevelle 406- Mine
1970 Chevelle 496- 10.2:1, 781 ovals, 3.31, 275/60 DR 3800lbs, [email protected] on 91 octane - Hers
CPMotorworks is offline  
post #45 of 66 (permalink) Old Sep 1st, 19, 7:21 AM
Senior Tech Team
Joe
 
Join Date: Nov 2003
Location: Thornton, Pa
Posts: 13,284
Re: 1969 L-36 390HP 427 CPMotorworks 2019

Quote:
Originally Posted by nashville beth View Post
I could paint my performer rpm orange. After grinding off edelbrock's CHEESY "made in america" flag. :-)

Not that our flag is cheesy. It just doesn't belong on an intake manifold

But I think I will have two nice setups for fuel delivery: I already have a "takeoff" Holley 850 vacuum secondary that is from a ZZ502. That will go on the performer rpm. I can use that when I go to the track.

Then my street setup will be the q-jet and stock 67 hi-rise intake.

It will be fun seeing if the q-jet can come close to the big Holley in qtr mile times.
The 850 Vac secondary Holley is flat out a terrible carb. I played with one of those on two versions of a 454 and then a very healthy 540 motor. If you're running any decent converter (ie 3000 stall), tuning the vacuum secondary is almost impossible. Either it is very slow to open, or with the lightest spring it opens so quick you get the lean bog. Maybe you'll have better luck.

Status: Car-Less


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
GRN69CHV is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome