HP Factor and car weight/class

Rod Greene · 02-24-2015, 09:15 PM

So like an idiot I couldn't stay away and went to Pomona. Talked to some people got the bug to finish one of my cars. It has been a few years since I raced so i have some questions on how the replacement head hp factor works. To make it easy say the shipping weight is 3000lbs and the HP factor is 300 makes it a natural E car. The replacement head is rated at 310 does it now make the car a natural D or do you have to add the weight and keep it in E. I know I could take weight out of the E combo and move to D my question is how does the replacement head HP work. I hope this makes sense.

Larry Hill · 02-24-2015, 09:35 PM

The factor is with the oem head only. Aftermarket head has to add or subtract weight to make it fit the oem head class.

Rod Greene · 02-24-2015, 10:12 PM

Thank You Larry. That is what I thought just wasn't sure.

Dwight Southerland · 02-25-2015, 12:05 AM

Look it up on www.classracerinfo.com I do all those calculations for you.

02-24-2015, 09:15 PM	#1
Rod Greene Senior Member Join Date: Mar 2002 Location: TN Posts: 530 Likes: 406 Liked 241 Times in 81 Posts	HP Factor and car weight/class So like an idiot I couldn't stay away and went to Pomona. Talked to some people got the bug to finish one of my cars. It has been a few years since I raced so i have some questions on how the replacement head hp factor works. To make it easy say the shipping weight is 3000lbs and the HP factor is 300 makes it a natural E car. The replacement head is rated at 310 does it now make the car a natural D or do you have to add the weight and keep it in E. I know I could take weight out of the E combo and move to D my question is how does the replacement head HP work. I hope this makes sense. __________________ Rod Greene Real men shift for them selves. Slowly working on TA Challenger for D,E/S and a 72 Challenger for SS/K, L as if I don't have enough other projects. Last edited by Rod Greene; 02-24-2015 at 09:18 PM.

02-24-2015, 09:35 PM	#2
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,583 Likes: 1,866 Liked 10,582 Times in 2,186 Posts	Re: HP Factor and car weight/class The factor is with the oem head only. Aftermarket head has to add or subtract weight to make it fit the oem head class. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

02-24-2015, 10:12 PM	#3
Rod Greene Senior Member Join Date: Mar 2002 Location: TN Posts: 530 Likes: 406 Liked 241 Times in 81 Posts	Re: HP Factor and car weight/class Thank You Larry. That is what I thought just wasn't sure. __________________ Rod Greene Real men shift for them selves. Slowly working on TA Challenger for D,E/S and a 72 Challenger for SS/K, L as if I don't have enough other projects.

02-25-2015, 12:05 AM	#4
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,996 Likes: 63 Liked 756 Times in 189 Posts	Re: HP Factor and car weight/class Look it up on www.classracerinfo.com I do all those calculations for you. __________________

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