Crate Motor question

07-23-2008, 11:06 AM

I'm familiar with Stock Eliminator cars but am putting together a crate motor combination and had a couple questions. I've searched this forum, as well as the IHRA web site, and still had some questions. My car is a '94 Z28 (hardtop stick car) that I'm going to put a 350/330/340 Vortec motor in.

1. What class(es) will this fall in and what will my race weights be? I know it is a natural B or C car with the LT1.

2. Are roller rockers permitted? I have a set of GM LT4 SA 1.6 rockers that I picked up somewhere.

3. Who would be some good sources to contact about having a nice set of heads done? I am going to do the shortblock myself.

Thanks for any help! I really appreciate it. Scott

Adger Smith · 07-23-2008, 12:49 PM

I just Re freshed one of my crate mtr customers 385 fast burn. When I originally did it we had to use the stamped steel rockers. They were a constant problem. It is now legal to use roller rockers in IHRA on Crate Mtrs & stockers.

Dragsinger · 07-23-2008, 02:30 PM

Gear Jammer,

I "think" this is the formula, if others see a flaw in my math, please speak up. Go to the NHRA site[IHRA uses these numbers], under "rules" pull down and select "stock car classification"

The lightest weight showing for a 1994 Camaro is 3044 pounds. [in IHRA, you can use the lightest NHRA weight, although you can also use the heavier weight] So, your Iron Vortec head engine is rated at 330 horse but factored to 340 horse. Here is the formula: 340 divided into 3044 = 8.95 pounds per horsepower. The class breaks are in 1/2 pound increments so you can run the car at the top of the 8.5 - 8.99 class. Also, you can move up one class to the 8.0 - 8.49 class, or down one class to the 9.0 - 9.49 class.
Thus:
8.0 x 340 = 2720 + 170 driver allowance = 2890. [probably would not get that light]
8.5 x 340 = 2890 + 170 = 3060 [maybe]
9.0 x 340 = 3060 + 170 = 3230 [most likely fit]

Then, what ever Crate Motor class runs at 9 pounds is your fit.

07-23-2008, 04:01 PM

Unless I'm missing it, I can't find anything on the IHRA web page. What class would be the 9 pound one? The car is going to be very light and I think 3230 would be a nice weight. With a Jerico do you think this will be a good combination?

Dragsinger · 07-23-2008, 05:04 PM

here ya go
http://www.ihra.com/competition/index.php#rulebook

tpoh815 · 07-23-2008, 05:21 PM

"G" crate motor

Dragsinger · 07-23-2008, 05:39 PM

I think your 94 Camaro with the Iron Vortec head with a stick would be great. That cylinder head is a strong runner. Plus, the F body 3rd & 4th generation are both proven performers.

Bobby Lundholm · 07-23-2008, 07:32 PM

For a good set of heads call Tim Sloan @ 919-258-5616.
One of the nicest guys you will meet, very helpful, and specializes in crate motors.

07-23-2008, 08:08 PM

Thanks for all the help. I'll give Tim a call on Thursday.

THE LEGEND · 07-23-2008, 09:36 PM

Gear Jammer,
I tried to PM you but it kicked back. Send me an e-mail chipthelegend@aol.com.
Chip

07-23-2008, 11:06 AM	#1
Gear Jammer '94 Guest Posts: n/a	Crate Motor question I'm familiar with Stock Eliminator cars but am putting together a crate motor combination and had a couple questions. I've searched this forum, as well as the IHRA web site, and still had some questions. My car is a '94 Z28 (hardtop stick car) that I'm going to put a 350/330/340 Vortec motor in. 1. What class(es) will this fall in and what will my race weights be? I know it is a natural B or C car with the LT1. 2. Are roller rockers permitted? I have a set of GM LT4 SA 1.6 rockers that I picked up somewhere. 3. Who would be some good sources to contact about having a nice set of heads done? I am going to do the shortblock myself. Thanks for any help! I really appreciate it. Scott

07-23-2008, 12:49 PM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 434 Liked 676 Times in 260 Posts	Re: Crate Motor question I just Re freshed one of my crate mtr customers 385 fast burn. When I originally did it we had to use the stamped steel rockers. They were a constant problem. It is now legal to use roller rockers in IHRA on Crate Mtrs & stockers. __________________ Adger Smith (Former SS)

07-23-2008, 02:30 PM	#3
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,759 Likes: 5 Liked 99 Times in 60 Posts	Re: Crate Motor question Gear Jammer, I "think" this is the formula, if others see a flaw in my math, please speak up. Go to the NHRA site[IHRA uses these numbers], under "rules" pull down and select "stock car classification" The lightest weight showing for a 1994 Camaro is 3044 pounds. [in IHRA, you can use the lightest NHRA weight, although you can also use the heavier weight] So, your Iron Vortec head engine is rated at 330 horse but factored to 340 horse. Here is the formula: 340 divided into 3044 = 8.95 pounds per horsepower. The class breaks are in 1/2 pound increments so you can run the car at the top of the 8.5 - 8.99 class. Also, you can move up one class to the 8.0 - 8.49 class, or down one class to the 9.0 - 9.49 class. Thus: 8.0 x 340 = 2720 + 170 driver allowance = 2890. [probably would not get that light] 8.5 x 340 = 2890 + 170 = 3060 [maybe] 9.0 x 340 = 3060 + 170 = 3230 [most likely fit] Then, what ever Crate Motor class runs at 9 pounds is your fit. __________________ Larry Woodfin 471W

07-23-2008, 04:01 PM	#4
Gear Jammer '94 Guest Posts: n/a	Re: Crate Motor question Unless I'm missing it, I can't find anything on the IHRA web page. What class would be the 9 pound one? The car is going to be very light and I think 3230 would be a nice weight. With a Jerico do you think this will be a good combination?

07-23-2008, 05:04 PM	#5
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,759 Likes: 5 Liked 99 Times in 60 Posts	Re: Crate Motor question here ya go http://www.ihra.com/competition/index.php#rulebook __________________ Larry Woodfin 471W

07-23-2008, 05:21 PM	#6
tpoh815 Senior Member Join Date: Oct 2003 Location: West Seneca Posts: 527 Likes: 48 Liked 18 Times in 8 Posts	Re: Crate Motor question "G" crate motor __________________ EX 5-Doorstocker

07-23-2008, 05:39 PM	#7
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,759 Likes: 5 Liked 99 Times in 60 Posts	Re: Crate Motor question I think your 94 Camaro with the Iron Vortec head with a stick would be great. That cylinder head is a strong runner. Plus, the F body 3rd & 4th generation are both proven performers. __________________ Larry Woodfin 471W

07-23-2008, 07:32 PM	#8
Bobby Lundholm Member Join Date: Dec 2006 Location: Charlevoix, MI Posts: 421 Likes: 94 Liked 84 Times in 33 Posts	Re: Crate Motor question For a good set of heads call Tim Sloan @ 919-258-5616. One of the nicest guys you will meet, very helpful, and specializes in crate motors. __________________ Bobby Lundholm 3516 G/SA

07-23-2008, 08:08 PM	#9
Gear Jammer '94 Guest Posts: n/a	Re: Crate Motor question Thanks for all the help. I'll give Tim a call on Thursday.

07-23-2008, 09:36 PM	#10
THE LEGEND VIP Member Join Date: Aug 2002 Location: Fayetteville, n.c. Posts: 1,411 Likes: 0 Liked 1 Time in 1 Post	Re: Crate Motor question Gear Jammer, I tried to PM you but it kicked back. Send me an e-mail chipthelegend@aol.com. Chip