Latest NHRA Engine HP and Engine Parts updates

FED 387 · 01-28-2025, 12:34 AM

Check em out ---FED 387

goinbroke2 · 01-28-2025, 05:22 PM

GM 307 200/165 change to 307 200/260 1971 Nova Stock

95hp?? In one hit? Who did that or is it a mistake? Thinking maybe 165hp to 160hp?

Larry Hill · 01-28-2025, 05:40 PM

On the 376/ 385 Direct Injection engine the dome was changed from .045” high with a volume of 4.0 cc to a .060” dome height with a volume of 4.1 cc.

I wonder how many times they had to pour to arrive at the .015” taller dome only displacing .1cc more volume.

Maybe NHRA has a portable climate controlled room maintaining a standard temperature.

MR DERBY CITY · 01-28-2025, 05:44 PM

Quote:

Originally Posted by goinbroke2

GM 307 200/165 change to 307 200/260 1971 Nova Stock

95hp?? In one hit? Who did that or is it a mistake? Thinking maybe 165hp to 160hp?

Oh it is no mistake , Billy Nees is responsible for the extra 95 HP……..….LOL.!!!

Larry Hill · 01-28-2025, 05:58 PM

Just looking but the 2010 428 Ford piston has w/notches but no cc volume.

I would be surprised if that was not on the tech list of things to do!

GUMP · 01-28-2025, 06:17 PM

Quote:

Originally Posted by Larry Hill

On the 376/ 385 Direct Injection engine the dome was changed from .045? high with a volume of 4.0 cc to a .060? dome height with a volume of 4.1 cc.

I wonder how many times they had to pour to arrive at the .015? taller dome only displacing .1cc more volume.

Maybe NHRA has a portable climate controlled room maintaining a standard temperature.

The dome shape is different on the stock piston when compared to the COPO piston. My factory installed pistons would have failed....

The head is as-cast too.

Larry Hill · 01-29-2025, 08:40 AM

If the dome is shorter than specified and smaller volume it should pass tech.
If they say it must be this tall or displace this many cc that could be a problem.

GUMP · 01-29-2025, 09:31 AM

Quote:

Originally Posted by Larry Hill

If the dome is shorter than specified and smaller volume it should pass tech.
If they say it must be this tall or displace this many cc that could be a problem.

I think that it is important for the stock piston to pass teardown....

01-28-2025, 12:34 AM	#1
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,399 Likes: 482 Liked 320 Times in 172 Posts	Latest NHRA Engine HP and Engine Parts updates Check em out ---FED 387

01-28-2025, 05:22 PM	#2
goinbroke2 Senior Member Join Date: Mar 2002 Location: NS CANADA Posts: 832 Likes: 1,302 Liked 319 Times in 121 Posts	Re: Latest NHRA Engine HP and Engine Parts updates GM 307 200/165 change to 307 200/260 1971 Nova Stock 95hp?? In one hit? Who did that or is it a mistake? Thinking maybe 165hp to 160hp? __________________ Jim Miller 103 U/SA

01-28-2025, 05:40 PM	#3
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,582 Likes: 1,866 Liked 10,582 Times in 2,186 Posts	Re: Latest NHRA Engine HP and Engine Parts updates On the 376/ 385 Direct Injection engine the dome was changed from .045” high with a volume of 4.0 cc to a .060” dome height with a volume of 4.1 cc. I wonder how many times they had to pour to arrive at the .015” taller dome only displacing .1cc more volume. Maybe NHRA has a portable climate controlled room maintaining a standard temperature. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 01-28-2025 at 05:43 PM.

01-28-2025, 05:58 PM	#5
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,582 Likes: 1,866 Liked 10,582 Times in 2,186 Posts	Re: Latest NHRA Engine HP and Engine Parts updates Just looking but the 2010 428 Ford piston has w/notches but no cc volume. I would be surprised if that was not on the tech list of things to do! __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

01-29-2025, 08:40 AM	#7
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,582 Likes: 1,866 Liked 10,582 Times in 2,186 Posts	Re: Latest NHRA Engine HP and Engine Parts updates If the dome is shorter than specified and smaller volume it should pass tech. If they say it must be this tall or displace this many cc that could be a problem. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 01-29-2025 at 08:46 AM.