Best Mopar engine for SSGT? - Page 2

Greg Gay · 05-25-2007, 10:36 PM

RJ,

The 70 and 71 high compression 340's have a 2.02 intake valve. The 72 and 73 low compression 340's have a 1.88 intake valve. I am assuming heads with the 2.02 valve can flow substantially more air than the 1.88 with S/S style porting.

Charlie Walc ran one of the high compression 340's in S/S years ago. He said it was a fun car, but an expensive one.

Paul Precht · 05-26-2007, 12:58 AM

Hi Stewart, I'm not sure if the 67 383 AFB has the weights in the rear or not. I have flowed the one without the weights and it was 565 cfm. The AVS is 635 and the 70 Holley is 645. These are clean stock carbs I had laying around, The numbers are rounded to the nearest 5. If the intake will be custom made the Stage V head which is similar to the 346 and 452 would be the best bet. If you use a store bought mani the 906 head can be an advantage. I would stay away from the 67. Paul.

RJ · 05-26-2007, 06:17 AM

Quote:

RJ,

The 70 and 71 high compression 340's have a 2.02 intake valve. The 72 and 73 low compression 340's have a 1.88 intake valve. I am assuming heads with the 2.02 valve can flow substantially more air than the 1.88 with S/S style porting.

Charlie Walc ran one of the high compression 340's in S/S years ago. He said it was a fun car, but an expensive one.

Greg, for some reason NHRA says the 2.020" intake head requires the same intake port volume as the 1.880" valved heads, so I don't know there is much there once you sink the valve/fill in the floor. The piston is the only other difference, and I can get a piston weight at or below what the low compression 340's currently run.

George Mirza · 05-26-2007, 08:58 PM

Hey Paulie,
Sam Dillow is looking to contact you. Send me a message with a number he can reach you at.
Gmirza1236@aol.com

Greg Gay · 05-26-2007, 09:57 PM

RJ, you may be right. The port volume may be restrictive enough that the bigger valve makes no difference. I understand that the area closest to the valve is the most important, and as you move back upstream, it has less effect. I certainly have no first-hand experience doing any port work. Perhaps Paulie, who has been posting on this thread, might have some ideas.

RJ, do you run a late model GTO? If so, how fast is it, and what modifications have you made to it?

RJ · 05-27-2007, 12:34 AM

davyjones · 05-27-2007, 01:36 AM

I am not a mopar guy at all ... but it seems that wayne taylor , ken etter, Bob mazzolini have had pretty fast cars with the 318. i have no clue what year or car that combo is from .

RJ · 05-27-2007, 02:15 AM

Greg, e-mail me - carolinaperf@yahoo.com

Dwight Southerland · 05-28-2007, 08:57 AM

The '70 Holley on the Road Runner/Super Bee engine (335hp) flows considerably more than 645 cfm. The primaries are 1.562" (same as a 600 cfm carb) and the secondaries are 1.750" (same as an 850 cfm carb). I had one on my flow bench recently and it was well over 700 cfm.

roadrunnerrunner · 06-12-2007, 12:34 AM

Stewart, you may want to contact Jim Fitzpatrick in Orlando.He does a fair amount of heads ..all Mopar I think.He seems to be very knowledgeable and alwaya willing to help.

05-26-2007, 08:58 PM	#14
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Hey Paulie, Sam Dillow is looking to contact you. Send me a message with a number he can reach you at. Gmirza1236@aol.com __________________ GEORGE MIRZA STK 1236

05-28-2007, 08:57 AM	#19
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,001 Likes: 64 Liked 780 Times in 194 Posts	The '70 Holley on the Road Runner/Super Bee engine (335hp) flows considerably more than 645 cfm. The primaries are 1.562" (same as a 600 cfm carb) and the secondaries are 1.750" (same as an 850 cfm carb). I had one on my flow bench recently and it was well over 700 cfm. __________________

05-25-2007, 10:36 PM	#11
Greg Gay Member Join Date: Aug 2003 Location: Vermont Posts: 388 Likes: 21 Liked 285 Times in 72 Posts	RJ, The 70 and 71 high compression 340's have a 2.02 intake valve. The 72 and 73 low compression 340's have a 1.88 intake valve. I am assuming heads with the 2.02 valve can flow substantially more air than the 1.88 with S/S style porting. Charlie Walc ran one of the high compression 340's in S/S years ago. He said it was a fun car, but an expensive one.

05-26-2007, 12:58 AM	#12
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 733 Likes: 359 Liked 327 Times in 121 Posts	Hi Stewart, I'm not sure if the 67 383 AFB has the weights in the rear or not. I have flowed the one without the weights and it was 565 cfm. The AVS is 635 and the 70 Holley is 645. These are clean stock carbs I had laying around, The numbers are rounded to the nearest 5. If the intake will be custom made the Stage V head which is similar to the 346 and 452 would be the best bet. If you use a store bought mani the 906 head can be an advantage. I would stay away from the 67. Paul.

05-26-2007, 09:57 PM	#15
Greg Gay Member Join Date: Aug 2003 Location: Vermont Posts: 388 Likes: 21 Liked 285 Times in 72 Posts	RJ, you may be right. The port volume may be restrictive enough that the bigger valve makes no difference. I understand that the area closest to the valve is the most important, and as you move back upstream, it has less effect. I certainly have no first-hand experience doing any port work. Perhaps Paulie, who has been posting on this thread, might have some ideas. RJ, do you run a late model GTO? If so, how fast is it, and what modifications have you made to it?

05-27-2007, 12:34 AM	#16
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts

05-27-2007, 01:36 AM	#17
davyjones Junior Member Join Date: Dec 2003 Location: ALTA LOMA , CA Posts: 92 Likes: 0 Liked 1 Time in 1 Post	I am not a mopar guy at all ... but it seems that wayne taylor , ken etter, Bob mazzolini have had pretty fast cars with the 318. i have no clue what year or car that combo is from .

05-27-2007, 02:15 AM	#18
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Greg, e-mail me - carolinaperf@yahoo.com

06-12-2007, 12:34 AM	#20
roadrunnerrunner Junior Member Join Date: May 2007 Location: Ocala, Florida Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Stewart, you may want to contact Jim Fitzpatrick in Orlando.He does a fair amount of heads ..all Mopar I think.He seems to be very knowledgeable and alwaya willing to help.