351 C 2bbl History ??

Dave Noll · 01-11-2014, 06:25 PM

I'm curious how this engine started @ 164 hp and is now factored @ 240 hp. I see a 72 165/350 chev with more compression & a slightly bigger carb is between 224 - 230. I know I have the bigger ports/valves with the cleveland but I'm not finding that advantageous. I know of one person who tried the 351c 2bbl route but he couldnt run the numbers. Has somebody run this succesfully to get the # to 240 or was this just an NHRA "THING"?

Billy Nees · 01-11-2014, 07:01 PM

Quote:

Originally Posted by Dave Noll

I'm curious how this engine started @ 164 hp and is now factored @ 240 hp. Has somebody run this succesfully to get the # to 240 or was this just an NHRA "THING"?

It received it's 240 rating based on an "overrated" gross rating from the late 60s and early 70s. When the manufacturers went to a net HP rating in 1972? it put NHRA in a position of having to assign a realistic number to these combos so they looked at the nearest gross rated combo that they could find and rated them from that.
On a lighter note, they are a lot more receptive to giving these combos back HP than they have ever been.

Bill Diehl · 01-11-2014, 08:41 PM

Quote:

Originally Posted by Billy Nees

It received it's 240 rating based on an "overrated" gross rating from the late 60s and early 70s. When the manufacturers went to a net HP rating in 1972? it put NHRA in a position of having to assign a realistic number to these combos so they looked at the nearest gross rated combo that they could find and rated them from that.
On a lighter note, they are a lot more receptive to giving these combos back HP than they have ever been.

So, if I ask nicely they will show some love to the 71 Boss that's at 355 now?

Seriously, no block, no crank, Chinese rods, when everybody else get the aftermarket good stuff?

Dave Noll · 01-11-2014, 09:33 PM

Bill,
I think this is the car that put the hurt on that combo BUT it was a while ago.

8. Rob Youngblood, Nampa, Idaho, D/S '71 Mustang, 10.698 (-1.102)

He races a Vette now.

Dave Noll · 01-12-2014, 12:55 AM

Billy,
Did some research. The 71 is the same engine rated @ 240 in both sides of the classification guide. The 70 has a little more cam, carb, & compression & is @ 250. I dug out an old old Motor's manual & looked up the 70 & it also had it rated @ 250 @ 4600 & torque was 355 @ 2600. Since apparently Ford had this thing (71,72) @ 240 do you think NHRA will go below that ?

Billy Nees · 01-12-2014, 09:16 AM

Bill, I doubt it!

Dave, yup.

Dave Noll · 01-12-2014, 05:36 PM

Worth a try. Thanks.

01-11-2014, 06:25 PM	#1
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 709 Likes: 2,666 Liked 238 Times in 111 Posts	351 C 2bbl History ?? I'm curious how this engine started @ 164 hp and is now factored @ 240 hp. I see a 72 165/350 chev with more compression & a slightly bigger carb is between 224 - 230. I know I have the bigger ports/valves with the cleveland but I'm not finding that advantageous. I know of one person who tried the 351c 2bbl route but he couldnt run the numbers. Has somebody run this succesfully to get the # to 240 or was this just an NHRA "THING"? __________________ Dave Noll, EF/S ,?/SA 6526

01-11-2014, 09:33 PM	#4
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 709 Likes: 2,666 Liked 238 Times in 111 Posts	Re: 351 C 2bbl History ?? Bill, I think this is the car that put the hurt on that combo BUT it was a while ago. 8. Rob Youngblood, Nampa, Idaho, D/S '71 Mustang, 10.698 (-1.102) He races a Vette now. __________________ Dave Noll, EF/S ,?/SA 6526

01-12-2014, 12:55 AM	#5
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 709 Likes: 2,666 Liked 238 Times in 111 Posts	Re: 351 C 2bbl History ?? Billy, Did some research. The 71 is the same engine rated @ 240 in both sides of the classification guide. The 70 has a little more cam, carb, & compression & is @ 250. I dug out an old old Motor's manual & looked up the 70 & it also had it rated @ 250 @ 4600 & torque was 355 @ 2600. Since apparently Ford had this thing (71,72) @ 240 do you think NHRA will go below that ? __________________ Dave Noll, EF/S ,?/SA 6526

01-12-2014, 09:16 AM	#6
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,487 Likes: 3,588 Liked 7,685 Times in 1,732 Posts	Re: 351 C 2bbl History ?? Bill, I doubt it! Dave, yup. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

01-12-2014, 05:36 PM	#7
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 709 Likes: 2,666 Liked 238 Times in 111 Posts	Re: 351 C 2bbl History ?? Worth a try. Thanks. __________________ Dave Noll, EF/S ,?/SA 6526