Question about 750 Holley for crate motor

Jeremy K · 04-03-2010, 11:26 PM

I have a 750 holley to use on an IHRA crate motor, but it is missing the rear metering block. Just wondering if it is legal to use aftermarket metering blocks, such as the ones from AED. Thanks.

Dragsinger · 04-04-2010, 07:47 AM

Jeremy,

I "think" tech inspection would not like a billet replacement metering block. Modified metering block would be fine, just need to be of an original Holley material.

Also, you need the choke plate in place. The choke linkage is not required, just the plate and shaft, can be held open with a screw or such.

The "spirit" of the carb rule is, no external mods. Internal jetting, air, fuel mods are ok. No mods to the venture or throttle plates.

BLP, (Bo Laws Products) can supply anything you need. They are completely up-to-speed with class competition carbs.

X-TECH MAN · 04-04-2010, 07:49 AM

Quote:

Originally Posted by jeremy k

i have a 750 holley to use on an ihra crate motor, but it is missing the rear metering block. Just wondering if it is legal to use aftermarket metering blocks, such as the ones from aed. Thanks.

no.............

Jeremy K · 04-04-2010, 08:24 PM

Thanks for the replies. I looked on Summit and they have cast aluminum replacement metering blocks from AED and I looked at the replacement blocks from BLP also. Is it safe for me to assume that these would be acceptable for crate motor stock? Are there other options I could look into? Again, I don't have the secondary block which is the reason I'm looking to get replacements. The carb is a Holley 4779-3 if that helps. Thanks again.

Myron Piatek · 04-05-2010, 11:05 AM

While IHRA does allow the aluminum Quick Fuel and Holley Ultra 750 carbs on small blocks with choke tower, plate, etc., they may not allow swapping parts from different brands. You may have to call Mike Baker just to be sure.

I'll have to do some looking, but I may have a spare metering block or two. Just not sure of the application till I find them.

04-03-2010, 11:26 PM	#1
Jeremy K Junior Member Join Date: Nov 2009 Location: Bridgewater, NS, Canada Posts: 79 Likes: 0 Liked 1 Time in 1 Post	Question about 750 Holley for crate motor I have a 750 holley to use on an IHRA crate motor, but it is missing the rear metering block. Just wondering if it is legal to use aftermarket metering blocks, such as the ones from AED. Thanks.

04-04-2010, 07:47 AM	#2
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,759 Likes: 5 Liked 99 Times in 60 Posts	Re: Question about 750 Holley for crate motor Jeremy, I "think" tech inspection would not like a billet replacement metering block. Modified metering block would be fine, just need to be of an original Holley material. Also, you need the choke plate in place. The choke linkage is not required, just the plate and shaft, can be held open with a screw or such. The "spirit" of the carb rule is, no external mods. Internal jetting, air, fuel mods are ok. No mods to the venture or throttle plates. BLP, (Bo Laws Products) can supply anything you need. They are completely up-to-speed with class competition carbs. __________________ Larry Woodfin 471W

04-04-2010, 08:24 PM	#4
Jeremy K Junior Member Join Date: Nov 2009 Location: Bridgewater, NS, Canada Posts: 79 Likes: 0 Liked 1 Time in 1 Post	Re: Question about 750 Holley for crate motor Thanks for the replies. I looked on Summit and they have cast aluminum replacement metering blocks from AED and I looked at the replacement blocks from BLP also. Is it safe for me to assume that these would be acceptable for crate motor stock? Are there other options I could look into? Again, I don't have the secondary block which is the reason I'm looking to get replacements. The carb is a Holley 4779-3 if that helps. Thanks again.

04-05-2010, 11:05 AM	#5
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,539 Likes: 34 Liked 134 Times in 49 Posts	Re: Question about 750 Holley for crate motor While IHRA does allow the aluminum Quick Fuel and Holley Ultra 750 carbs on small blocks with choke tower, plate, etc., they may not allow swapping parts from different brands. You may have to call Mike Baker just to be sure. I'll have to do some looking, but I may have a spare metering block or two. Just not sure of the application till I find them.