C3: 1970 LT1 Carb metering block #'s.

[Dan Pepper]

I recently purchased a '70 LT1 Holley list 4555 carburetor. It's GM part #3972121, dated 023. I'm curious if it retains it's stock metering blocks. The front metering block is stamped 6333 ,and the rear is stamped 4519. Are these the correct metering blocks for the carb? Thanks.

[Robert E.]

Re: C3: 1970 LT1 Carb metering block #'s.

Hi Dan,

According to the 4th edition of the '70-'72 TIM, you do indeed have the correct metering blocks.

Robert

[Dave S.]

Re: C3: 1970 LT1 Carb metering block #'s.

Dan,

#6333 and #4519 are correct. #3972121 is correct as well. 023 is 3rd week of Feb. 1970. My 70 VIN 14803 has a 1st week of March 1970 date on the Holley.

[Terry M.]

Re: C3: 1970 LT1 Carb metering block #'s.

Dan -- Service metering blocks had two sets of numbers stamped on them -- one of which will be the correct numbers you cite. So long as your metering blocks have only the numbers you mention -- you are good to go.

[Dan Pepper]

It's correct then. Thanks for the info. *NM*

[Clem Z.]

i have seen holley metering blocks

stamped with both the metering block part number and the carb number. these were not replacement metering bodies but on original carbs.