Stock 1975 Dodge Coronet. Mopar guys.

383bigblock · 12-12-2020, 07:36 PM

What engine in a 1975 Coronet 2 door would make for a good(consistent/competitive) combination in NHRA stock? 318 or 400? Can anybody recall seeing a 1975 Coronet being raced in Stock? Any ideas or information would be appreciated. Thank you.

Myron Piatek · 12-12-2020, 10:51 PM

You might be able to outfit a 2 door as a Road Runner also.

Register and log in to research the options here:.

http://www.classracerinfo.com/

GTX JOHN · 12-13-2020, 12:00 AM

Convert to 78 = just some trim change Grille etc.

318/230
360/276

These are the best factors for this body

We race both these combos with success

383bigblock · 12-13-2020, 07:25 PM

Interesting. Just for my own understanding why wouldn't the 190hp or 235 hp 400 engines be good as a combination? Is it because they, if I'm reading the NHRA classification correctly, have been factored to 310hp and 320hp respectively. Is the low compression that much of a hindrance? What about the 1975 360 190hp? Good combination even if its been factored to 276hp?

GTX JOHN · 12-13-2020, 09:21 PM

The 400 in our 74 Ply. Sat. is 294 iron 296 Aluminum = same engine at 310 or 320 - You would not stand a chance against us.

The 360 / 190 if a four barrel would be OK.

The 318 to be a four barrel has to be 78 up.

383bigblock · 12-13-2020, 10:35 PM

Thank you for taking time to answer my questions GTX John. It is appreciated since I am trying to learn and you have the knowledge gained from hard work and experience. If you have the time could you explain why the 400 combination works in a 1974 Plymouth but may not be so good in a 1975 Dodge. Trying to learn the ins and outs. Thank you.

GTX JOHN · 12-14-2020, 01:15 AM

Different Horsepower factors for similar engines in different year
cars.

My 73 400/Aluminum head = 296
Your 75 400/alum. head = 320

I/SA 12 LBs. per HP
Means your similar engine would have to weigh 290 Lbs
more than my car in the same class - An almost impossible
difference in weight to overcome give everything else is the same!

Much easier to change year of car when it is just grille/taillights
would give you a better factor or combo to work with!

The 78 318/230 is a great combo= we held the National Record and
many class wins including Indy before my son got bored with it and
decide to go faster!

The 78 360 started out at 270 and was a class winner and fast.
Eventually the Wagon was factored to 289 while the sedan was 270
making class impossible for us. Now all the 78 360 are at 289 with
either big cam or our old small cam version. The big cam is still
OK but no longer a killer combo.

Half the battle in Stock and Superstock is selecting the most competitive combo
out of some many possible choices.

Billy Nees · 12-14-2020, 08:24 AM

Quote:

Originally Posted by GTX JOHN

Half the battle in Stock and Superstock is selecting the most competitive combo out of some many possible choices.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^This!^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Dave Gantz · 12-14-2020, 08:28 AM

It doesn't make sense, so don't be confused. NHRA doesn't make sense. There is not much logic.

383bigblock · 12-15-2020, 12:23 PM

Thank you everybody for the replies and insight. As this would be my first experience with NHRA stock along with a couple of friends and we have a 1975 Coronet with a 400 it seems that if we went this route it would be a learning experience and wouldn't be competitive on a national level and/or in a heads up situation, not that we're expecting that. Might it be at least a consistent combination with either the 400 or 360?

12-12-2020, 07:36 PM	#1
383bigblock Junior Member Join Date: Oct 2009 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Stock 1975 Dodge Coronet. Mopar guys. What engine in a 1975 Coronet 2 door would make for a good(consistent/competitive) combination in NHRA stock? 318 or 400? Can anybody recall seeing a 1975 Coronet being raced in Stock? Any ideas or information would be appreciated. Thank you.

12-12-2020, 10:51 PM	#2
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,538 Likes: 34 Liked 132 Times in 48 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. You might be able to outfit a 2 door as a Road Runner also. Register and log in to research the options here:. http://www.classracerinfo.com/ __________________ LOCOMOTION Racing

12-13-2020, 12:00 AM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,528 Likes: 2,220 Liked 1,792 Times in 571 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. Convert to 78 = just some trim change Grille etc. 318/230 360/276 These are the best factors for this body We race both these combos with success __________________ John Irving 741 Stock 741 Super Stock

12-13-2020, 07:25 PM	#4
383bigblock Junior Member Join Date: Oct 2009 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. Interesting. Just for my own understanding why wouldn't the 190hp or 235 hp 400 engines be good as a combination? Is it because they, if I'm reading the NHRA classification correctly, have been factored to 310hp and 320hp respectively. Is the low compression that much of a hindrance? What about the 1975 360 190hp? Good combination even if its been factored to 276hp?

12-13-2020, 09:21 PM	#5
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,528 Likes: 2,220 Liked 1,792 Times in 571 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. The 400 in our 74 Ply. Sat. is 294 iron 296 Aluminum = same engine at 310 or 320 - You would not stand a chance against us. The 360 / 190 if a four barrel would be OK. The 318 to be a four barrel has to be 78 up. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 12-13-2020 at 09:28 PM.

12-13-2020, 10:35 PM	#6
383bigblock Junior Member Join Date: Oct 2009 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. Thank you for taking time to answer my questions GTX John. It is appreciated since I am trying to learn and you have the knowledge gained from hard work and experience. If you have the time could you explain why the 400 combination works in a 1974 Plymouth but may not be so good in a 1975 Dodge. Trying to learn the ins and outs. Thank you.

12-14-2020, 01:15 AM	#7
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,528 Likes: 2,220 Liked 1,792 Times in 571 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. Different Horsepower factors for similar engines in different year cars. My 73 400/Aluminum head = 296 Your 75 400/alum. head = 320 I/SA 12 LBs. per HP Means your similar engine would have to weigh 290 Lbs more than my car in the same class - An almost impossible difference in weight to overcome give everything else is the same! Much easier to change year of car when it is just grille/taillights would give you a better factor or combo to work with! The 78 318/230 is a great combo= we held the National Record and many class wins including Indy before my son got bored with it and decide to go faster! The 78 360 started out at 270 and was a class winner and fast. Eventually the Wagon was factored to 289 while the sedan was 270 making class impossible for us. Now all the 78 360 are at 289 with either big cam or our old small cam version. The big cam is still OK but no longer a killer combo. Half the battle in Stock and Superstock is selecting the most competitive combo out of some many possible choices. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 12-14-2020 at 01:21 AM.

12-14-2020, 08:28 AM	#9
Dave Gantz Senior Member Join Date: Nov 2005 Location: Verrry South Jersey Posts: 529 Likes: 125 Liked 223 Times in 118 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. It doesn't make sense, so don't be confused. NHRA doesn't make sense. There is not much logic.

12-15-2020, 12:23 PM	#10
383bigblock Junior Member Join Date: Oct 2009 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Stock 1975 Dodge Coronet. Mopar guys. Thank you everybody for the replies and insight. As this would be my first experience with NHRA stock along with a couple of friends and we have a 1975 Coronet with a 400 it seems that if we went this route it would be a learning experience and wouldn't be competitive on a national level and/or in a heads up situation, not that we're expecting that. Might it be at least a consistent combination with either the 400 or 360?