462624 Chevy head question

Rick Schilling · 12-05-2011, 06:41 PM

Does anyone have knowledge about the differences in 462624 small block Chevy cylinder heads? I know that for the most part, they are light weight castings (scalloped along the lower edge) and can be somewhat prone to cracking. There seems to be, however, multiple versions of the same head, all with the same casting number. Some are scalloped and some are not. Some have different markings on the ends than others. Some are found on GM crate motors made in Mexico and there is also a marine version. Which ones are preferred and how can they most easily be identified?

FED 387 · 12-05-2011, 06:57 PM

probably the worst if not one of the worst heads Chevy ever made!!! TOTAL JUNK!!!! Look at a used set of used Vortec or Dart heads---New better to start with right out of the box--- fix em up for hi po if ya want---my opinion---Comp

Bobby Zlatkin · 12-06-2011, 06:19 AM

Rick, you're right, they are light weight castings and prone to cracking.

However, if that is what you are required to run, then you have no other choice. I would look for the heaver, flat accross the bottom 'made in Mexico' heads. I think there is more meat there. They were used on early crate motors (late eighties, early 90's.) back when they were called 'Target Master' motors.

Your best bet on finding a pair would be in a junk yard, out of a truck. I was lucky. I found a virgin pair of Target Master "made in Mexico" heads at a swap meet.

pmrphil · 12-06-2011, 10:18 PM

I believe that some of the truck applications also had 3/8 exhaust stems

rustbucket79 · 12-08-2011, 02:21 AM

Truck heads were 1.72/1.5, car heads were 1.94/1.5, and they were offered over the counter with 2.02/1.60 (a la L 82 heads) We've never come across a set of heavy castings with that casting number.

Mike Taylor 3601 · 12-08-2011, 01:52 PM

Rust bucket is correct to add to his info I don't remember a Mexico version.
Mike Taylor 3601

Rick Schilling · 12-12-2011, 07:48 PM

Thanks to everyone for your input. I really do appreciate it.

12-05-2011, 06:41 PM	#1
Rick Schilling Member Join Date: Feb 2009 Location: Indy Posts: 103 Likes: 18 Liked 14 Times in 10 Posts	462624 Chevy head question Does anyone have knowledge about the differences in 462624 small block Chevy cylinder heads? I know that for the most part, they are light weight castings (scalloped along the lower edge) and can be somewhat prone to cracking. There seems to be, however, multiple versions of the same head, all with the same casting number. Some are scalloped and some are not. Some have different markings on the ends than others. Some are found on GM crate motors made in Mexico and there is also a marine version. Which ones are preferred and how can they most easily be identified?

12-05-2011, 06:57 PM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,349 Likes: 328 Liked 280 Times in 150 Posts	Re: 462624 Chevy head question probably the worst if not one of the worst heads Chevy ever made!!! TOTAL JUNK!!!! Look at a used set of used Vortec or Dart heads---New better to start with right out of the box--- fix em up for hi po if ya want---my opinion---Comp

12-06-2011, 06:19 AM	#3
Bobby Zlatkin Member Join Date: Mar 2003 Location: Mills River, NC Posts: 417 Likes: 0 Liked 0 Times in 0 Posts	Re: 462624 Chevy head question Rick, you're right, they are light weight castings and prone to cracking. However, if that is what you are required to run, then you have no other choice. I would look for the heaver, flat accross the bottom 'made in Mexico' heads. I think there is more meat there. They were used on early crate motors (late eighties, early 90's.) back when they were called 'Target Master' motors. Your best bet on finding a pair would be in a junk yard, out of a truck. I was lucky. I found a virgin pair of Target Master "made in Mexico" heads at a swap meet. __________________ Bobby & Norene Zlatkin L/SA

12-06-2011, 10:18 PM	#4
pmrphil Member Join Date: Aug 2010 Location: CT Posts: 386 Likes: 1,255 Liked 248 Times in 107 Posts	Re: 462624 Chevy head question I believe that some of the truck applications also had 3/8 exhaust stems __________________ Phil Molski S/C 1623

12-08-2011, 02:21 AM	#5
rustbucket79 Junior Member Join Date: Aug 2004 Location: Canada Posts: 45 Likes: 0 Liked 0 Times in 0 Posts	Re: 462624 Chevy head question Truck heads were 1.72/1.5, car heads were 1.94/1.5, and they were offered over the counter with 2.02/1.60 (a la L 82 heads) We've never come across a set of heavy castings with that casting number.

12-08-2011, 01:52 PM	#6
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,303 Likes: 198 Liked 116 Times in 48 Posts	Re: 462624 Chevy head question Rust bucket is correct to add to his info I don't remember a Mexico version. Mike Taylor 3601

12-12-2011, 07:48 PM	#7
Rick Schilling Member Join Date: Feb 2009 Location: Indy Posts: 103 Likes: 18 Liked 14 Times in 10 Posts	Re: 462624 Chevy head question Thanks to everyone for your input. I really do appreciate it.