HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Class Racer Builds
Register Photo Gallery FAQ Community Calendar


Reply
 
Thread Tools Display Modes
Old 05-18-2024, 07:39 PM   #1
HP HUNTER
Senior Member
 
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 637
Likes: 76
Liked 317 Times in 115 Posts
Default 335 HP 396 290 Head Casting Build & Dyno Test

A while back I was looking for a transmission and came across a complete 335 HP 396 Stocker drive train for sale and and bought it. From what I've been told this engine/trans ran 3-5 tenths under the index in D/SA trim, dyno data also came with the engine which I will share as well. My plan is to go through the 290 head castings and see if I can make some improvements then dyno test the engine and finally run it in the car. I tore the heads down and preliminary cleaned them for a flow test, which I will post as the car ran 3-5 under the index. I will be testing the other head as well before any work starts to make sure it's similar in flow to the first head tested.
Attached Thumbnails
Click image for larger version

Name:	290.jpeg
Views:	1118
Size:	237.2 KB
ID:	69950  

Last edited by HP HUNTER; 05-19-2024 at 08:12 AM.
HP HUNTER is offline   Reply With Quote
Old 05-18-2024, 11:37 PM   #2
Jeff Stout
VIP Member
 
Join Date: Dec 2001
Location: phoenix
Posts: 1,461
Likes: 59
Liked 699 Times in 278 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

I have had 3 sets of 290 heads on s/s. The best set had bottom of exhaust brazed in and made flat. The intake as high as it could before going thru roof. Kept spring rate 300 or better closed. Under 300 I would lose 1 or more MPH.
Jeff Stout is offline   Reply With Quote
Liked
Old 05-19-2024, 08:27 AM   #3
HP HUNTER
Senior Member
 
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 637
Likes: 76
Liked 317 Times in 115 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

In the picture its hard to see but both the intake and exhaust valves are sunk quite a bit, probably to get CCs and piston to valve clearance, which I will check so I can get my heights setup before any work is done. Flow testing was done @ 28 inches, 4.350 bore, SF 600.

Short port:

.100 73
.200 131
.250 154
.300 181
.350 208
.400 232
.460 243

Long port:

.100 73
.200 132
.250 161
.300 185
.350 210
.400 235
.460 257


Exhaust: No pipe


.200 107
.300 131
.400 152
.480 165

One thing to note, when a BBC head is flat milled to the extent this head is, flow is lost, although I understand CCs have to be met some way, it's definitely a juggling act. At this point I will clean the head, then locate the highest (closes to the piston) intake and exhaust valve and check piston to valve clearance then CC the chambers, after this the cylinder head restoration will start with pictures. If anyone has flow data for this type of casting in Stock Eliminator trim casting numbers, please feel free to post along with opinions.

063
215
290

Last edited by HP HUNTER; 05-19-2024 at 08:40 AM.
HP HUNTER is offline   Reply With Quote
Old 05-19-2024, 11:32 AM   #4
Tim H
VIP Member
 
Tim H's Avatar
 
Join Date: Jan 2007
Posts: 1,032
Likes: 1,010
Liked 478 Times in 155 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Chev V8 Big Block Cylnder Head 3964290 Small plug Flow Data - unported
Data Source Int/Ex Valve .100 .200 .300 .400 .500 .600
Chevy 290 Oval Port Iron CHP 01
253.0 / 112.0 cc's, Exhaust = No Pipe 2.065"/1.725" 60/47 122/88 172/113 214/133 244/152 256/161
Chevy 290 Oval Port Iron CHP 02
253.0 / 112.0 cc's, Exhaust = Pipe 2.065"/1.725" 60/47 122/90 172/118 214/138 244/160 256/174
Special thanks to Stan Weiss for supplying data. This is only a small detail of information available on his website. It is worth the time to dig into his stuff at
Tim H is offline   Reply With Quote
Liked
Old 05-19-2024, 10:52 PM   #5
Glenn Briglio
VIP Member
 
Glenn Briglio's Avatar
 
Join Date: Nov 2002
Location: Massapequa Park,NY
Posts: 1,251
Likes: 1,819
Liked 923 Times in 287 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Flow test should be done with correct bore size or you could be getting incorrect data.
__________________
1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.
Glenn Briglio is online now   Reply With Quote
Old 05-19-2024, 11:33 PM   #6
HP HUNTER
Senior Member
 
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 637
Likes: 76
Liked 317 Times in 115 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Quote:
Originally Posted by Glenn Briglio View Post
Flow test should be done with correct bore size or you could be getting incorrect data.
I will agree, but I'm just looking to see the gain, I will not buy a bore sleeve and top plate for this small bore project. I've been very impressed with your qualifying, great work!
HP HUNTER is offline   Reply With Quote
Old 05-20-2024, 08:06 AM   #7
Dwight Southerland
VIP Member
 
Dwight Southerland's Avatar
 
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,986
Likes: 55
Liked 731 Times in 180 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Did you pour the intake and exhaust ports for volume?
__________________
Dwight Southerland is offline   Reply With Quote
Old 05-20-2024, 09:35 AM   #8
HP HUNTER
Senior Member
 
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 637
Likes: 76
Liked 317 Times in 115 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Quote:
Originally Posted by Dwight Southerland View Post
Did you pour the intake and exhaust ports for volume?
Not yet, but I certainly will pour them, when I'am done the intakes will pour less than they do now. I will not be doing any porting, and they were not ported previously.
HP HUNTER is offline   Reply With Quote
Old 05-20-2024, 12:32 PM   #9
Adger Smith
VIP Member
 
Join Date: Dec 2001
Location: Texarkana Ark/TX
Posts: 2,416
Likes: 517
Liked 758 Times in 291 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Mark,
since I'm not well informed about the stocker combinatons...
What year and body does the 335 HP 396 fit?
I found the small cam 1969 335 HP 427 in Dwights class tool section
__________________
Adger Smith (Former SS)

Last edited by Adger Smith; 05-20-2024 at 12:35 PM. Reason: add
Adger Smith is offline   Reply With Quote
Old 05-20-2024, 01:49 PM   #10
HP HUNTER
Senior Member
 
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 637
Likes: 76
Liked 317 Times in 115 Posts
Default Re: 335 HP 396 290 Head Casting Build & Dyno Test

Quote:
Originally Posted by Adger Smith View Post
Mark,
since I'm not well informed about the stocker combinatons...
What year and body does the 335 HP 396 fit?
I found the small cam 1969 335 HP 427 in Dwights class tool section
I believe its been factored down to 330 HP with an automatic, 1968 Nova, Camaro, Chevelle SS From GM 350 HP 396 .460/.480 lift. 335 HP 427 is .398 lift I believe.
HP HUNTER is offline   Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 06:48 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.