RPM vs MPH

Dan Fahey · 06-02-2018, 01:05 PM

What RPM are Stockers driving across the Traps and at what MPH?

Jason · 06-02-2018, 03:12 PM

More than what S/S and Modified did years ago.

GTX JOHN · 06-02-2018, 04:04 PM

Pretty Hard to answer that general a question because every combo
varies.

Our 340/318 Stocker even with Hyd. Lifters trap about 7200 to 7300 and
have for last 30 years or so (Since Valve Spring Pres. rule was changed).

Dan Fahey · 06-02-2018, 08:28 PM

Quote:

Originally Posted by GTX JOHN

Pretty Hard to answer that general a question because every combo
varies.

Our 340/318 Stocker even with Hyd. Lifters trap about 7200 to 7300 and
have for last 30 years or so (Since Valve Spring Pres. rule was changed).

Thank you..
It is good information.
My LT1 iron head in PS touches 6400 rpm at 105 mph best.
Trying to figure best gear and tire for a 4100 lb car moving to Stock.

Figure a long stroke Olds 455 would have 4.56s.
Remember GTOs seem to like 4.33s
305 SBC Camaros guessing like 5.13s
Depending on story 283s would go 7800rpm.

Dan

HR9121 · 06-02-2018, 10:21 PM

I would think you would want a 4.88 with that combo Dan.

Dan Fahey · 06-02-2018, 10:42 PM

Quote:

Originally Posted by HR9121

I would think you would want a 4.88 with that combo Dan.

Have 4.56s with 28 slicks

Mepprecht · 06-02-2018, 10:48 PM

Quote:

Originally Posted by HR9121

I would think you would want a 4.88 with that combo Dan.

That’s what the baby LT1 uses in my car. Cross at 6500 soooo

X-TECH MAN · 06-03-2018, 01:01 PM

Quote:

Originally Posted by Jason

More than what S/S and Modified did years ago.

Yepper.......You nailed it !

Greg Reimer 7376 · 06-05-2018, 08:42 PM

At Pomona, I ran 110.66 in my Chevelle first time run Thursday. Tach indicated 7465 RPM at the end. 5.57 gears, Hoosier 9 inch radial slicks, it felt like the engine probably wouldn't go much higher. The formula there is something like 68 RPM per MPH. The real fast 283 cars with 6. 14's at 103-105 must be over 8000. Scary to think about.

HR9121 · 06-05-2018, 09:19 PM

Garley Daniels once told me with a small block "RPM's are your friend" lol!

06-02-2018, 01:05 PM	#1
Dan Fahey VIP Member Join Date: Oct 2008 Posts: 2,128 Likes: 1,084 Liked 184 Times in 113 Posts	RPM vs MPH What RPM are Stockers driving across the Traps and at what MPH?

06-02-2018, 03:12 PM	#2
Jason Member Join Date: Jul 2003 Posts: 235 Likes: 0 Liked 6 Times in 4 Posts	Re: RPM vs MPH More than what S/S and Modified did years ago.

06-02-2018, 04:04 PM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,736 Likes: 2,808 Liked 2,487 Times in 698 Posts	Re: RPM vs MPH Pretty Hard to answer that general a question because every combo varies. Our 340/318 Stocker even with Hyd. Lifters trap about 7200 to 7300 and have for last 30 years or so (Since Valve Spring Pres. rule was changed). __________________ John Irving 741 Stock 741 Super Stock

06-02-2018, 10:21 PM	#5
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,467 Likes: 146 Liked 3,363 Times in 731 Posts	Re: RPM vs MPH I would think you would want a 4.88 with that combo Dan. __________________ James Williamson W200 J/SA. SS/JA

06-05-2018, 08:42 PM	#9
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,137 Likes: 172 Liked 719 Times in 220 Posts	Re: RPM vs MPH At Pomona, I ran 110.66 in my Chevelle first time run Thursday. Tach indicated 7465 RPM at the end. 5.57 gears, Hoosier 9 inch radial slicks, it felt like the engine probably wouldn't go much higher. The formula there is something like 68 RPM per MPH. The real fast 283 cars with 6. 14's at 103-105 must be over 8000. Scary to think about.

06-05-2018, 09:19 PM	#10
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,467 Likes: 146 Liked 3,363 Times in 731 Posts	Re: RPM vs MPH Garley Daniels once told me with a small block "RPM's are your friend" lol! __________________ James Williamson W200 J/SA. SS/JA