|
|
08-26-2023, 04:04 PM | #1 |
VIP Member
Join Date: Dec 2001
Location: Texarkana Ark/TX
Posts: 2,359
Likes: 443
Liked 684 Times in 266 Posts
|
SS/GT Engine Choice
Car will be a Gen 3 Camaro Badged as a IROC Z-28
Weight should put the car in GT/CA- GT/DA Depending on engine choice. 3 engine choices Idea is to use parts & pieces I have laying around my shop I Just want the best .50 - .80 under index runner. 1. '69 427 425/445 4.311 bore 3.76 stroke 12.7 actual measured compression 401 Alum heads 2.19/1.845 780 Vac Holley carb 2 '70 402 375/405 4.185 bore 3.76 Stroke 12.58 actual measured compression 401 Alum Heads 2.19/1.88 780 Vac Holley carb 3. '71 454 425/435 4.311 Bore 4 Stroke 10.96 actual measured compression 401 Alum Heads 2.19/1.88 780 Vac Holley Carb 4. '71 454 425/424 4.311 bore 4 stroke 10.96 actual measured compression Iron 188 or 990 heads 2.19/1.88 780 Vac Holley Carb I like what combination Dwight Southerland suggested, but I want to use parts I have available. Yes, I'm a tight Arse! If you don't want to make a public comment just DM/PM me Thanks, all comments are appreciated Adger Smith
__________________
Adger Smith (Former SS) Last edited by Adger Smith; 08-26-2023 at 04:16 PM. Reason: sp |
08-26-2023, 06:13 PM | #2 |
Member
Join Date: Mar 2006
Location: California
Posts: 147
Likes: 2
Liked 103 Times in 32 Posts
|
Re: SS/GT Engine Choice
[QUOTE=Adger Smith;685052]Car will be a Gen 3 Camaro Badged as a IROC Z-28
Weight should put the car in GT/CA- GT/DA Depending on engine choice. 3 engine choices Idea is to use parts & pieces I have laying around my shop I Just want the best .50 - .80 under index runner. 1. '69 427 425/445 4.311 bore 3.76 stroke 12.7 actual measured compression 401 Alum heads 2.19/1.845 780 Vac Holley carb 2 '70 402 375/405 4.185 bore 3.76 Stroke 12.58 actual measured compression 401 Alum Heads 2.19/1.88 780 Vac Holley carb 3. '71 454 425/435 4.311 Bore 4 Stroke 10.96 actual measured compression 401 Alum Heads 2.19/1.88 780 Vac Holley Carb 4. '71 454 425/424 4.311 bore 4 stroke 10.96 actual measured compression Iron 188 or 990 heads 2.19/1.88 780 Vac Holley Carb I like what combination Dwight Southerland suggested, but I want to use parts I have available. Yes, I'm a tight Arse! If you don't want to make a public comment just DM/PM me Thanks, all comments are appreciated Adger Smith[/ 1972 402
__________________
John Ancona 705 STK / SS |
Liked |
08-27-2023, 12:34 AM | #3 |
VIP Member
Join Date: Dec 2001
Location: Texarkana Ark/TX
Posts: 2,359
Likes: 443
Liked 684 Times in 266 Posts
|
Re: SS/GT Engine Choice
John,
I like the oval port as we discussed, but don't have the pieces for it. The only parts for the rectangle port combinations I need to buy is the pistons. I have a nice worked 401 heads & intake & carb. Thanks...
__________________
Adger Smith (Former SS) Last edited by Adger Smith; 08-27-2023 at 12:34 AM. Reason: sp |
08-27-2023, 10:39 AM | #4 |
Member
Join Date: Jul 2006
Location: South Dakota
Posts: 142
Likes: 65
Liked 332 Times in 51 Posts
|
Re: SS/GT Engine Choice
71 425/435 Would weigh in GT/CA close to smaller motors in GT/DA with only a .10 difference in index --- less likely to get hit with HP ,not many running this motor, plus with 4 in stroke piston speed will flow a lot of air. Bob
|
08-28-2023, 08:05 AM | #5 |
VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,982
Likes: 54
Liked 726 Times in 177 Posts
|
Re: SS/GT Engine Choice
Knowing that when it comes to spending you are tighter than skin on a grape, the 454-425/435 is the best choice since you have the heads already.
What did I recommend before? I don't remember that conversation.
__________________
|
08-28-2023, 09:57 AM | #6 |
VIP Member
Join Date: May 2006
Location: Murfreesboro TN
Posts: 4,930
Likes: 1,003
Liked 1,079 Times in 282 Posts
|
Re: SS/GT Engine Choice
I'd build the 402, at maximum bore size. With modern rings, good oil, etc, you'll get hundreds of passes on it.
If you have not purchased connecting rods and pistons, or ground the crank, I'd go with small block small journal and small block wrist pins, and a 1.0 MM/1.0MM/3.0MM ring package. I think that I have a nice, conservative, stock core (billet) camshaft for it, that Billy and Tim did for me. A certain wise and learned friend and I were discussing this on Thursday. For GT in particular.
__________________
Alan Roehrich 212A G/S |
Liked |
|
|