Where to look for # on 454 heads? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**FRENCHBLUE72** · 07-21-2007, 10:31 PM

Can anyone point me in the right direction here are some that I found anyone know what they mean???

front 336781 middle gm10t back k1574

**too much stuff** · 07-21-2007, 11:38 PM

454 oval port truck or car made on nov. 15 1974.

**FRENCHBLUE72** · 07-21-2007, 11:56 PM

Thanks for the quick reply....

bighead · 07-22-2007, 01:40 AM

good flowing large oval port heads

mnunn454 · 07-22-2007, 07:48 AM

Commonly referred to as "781s", they're really decent as a set of street heads. "049s" are comparable heads. They've got the larger valve sizes which helps airflow.

Chevy High Performance did a BBC Head "bake-off" of sorts a few years ago where they rated airflow and gave head stats for a variety of heads. 781s were included. It may still be on their website.

While not the best for racing, you can do a lot with these heads. Just be sure you have them checked out for defects, cracks etc, before going too far with them. Also, you'll want "open chambered" pistons to match so you can optimize the compression ratio.

**FRENCHBLUE72** · 07-22-2007, 08:18 AM

Thanks agian guys I have the heads and motor out of a suburban I had got the block # and just wanted the head # as I need a new intake..

07-21-2007, 10:31 PM	#1
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Where to look for # on 454 heads? Can anyone point me in the right direction here are some that I found anyone know what they mean??? front 336781 middle gm10t back k1574 __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

07-21-2007, 11:38 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,718	Re: Where to look for # on 454 heads? 454 oval port truck or car made on nov. 15 1974. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

07-21-2007, 11:56 PM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Re: Where to look for # on 454 heads? Thanks for the quick reply.... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

07-22-2007, 01:40 AM	#4
bighead Registered User Join Date: Nov 2005 Location: McKinney, Texas Posts: 465	Re: Where to look for # on 454 heads? good flowing large oval port heads

07-22-2007, 07:48 AM	#5
mnunn454 Registered User Join Date: Dec 2006 Location: Rhode Island Posts: 602	Re: Where to look for # on 454 heads? Commonly referred to as "781s", they're really decent as a set of street heads. "049s" are comparable heads. They've got the larger valve sizes which helps airflow. Chevy High Performance did a BBC Head "bake-off" of sorts a few years ago where they rated airflow and gave head stats for a variety of heads. 781s were included. It may still be on their website. While not the best for racing, you can do a lot with these heads. Just be sure you have them checked out for defects, cracks etc, before going too far with them. Also, you'll want "open chambered" pistons to match so you can optimize the compression ratio. __________________ 69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe

07-22-2007, 08:18 AM	#6
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Re: Where to look for # on 454 heads? Thanks agian guys I have the heads and motor out of a suburban I had got the block # and just wanted the head # as I need a new intake.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..



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