57 Vette FI heads...? - Page 2 - TriFive.com, 1955 Chevy 1956 chevy 1957 Chevy Forum , Talk about your 55 chevy 56 chevy 57 chevy - Belair , 210, 150 sedans , Nomads and Trucks, Research, Free Tech Advice

Click here to see our full list of sponsors for all your Parts and Restoration Needs

Click here to find Out all of the Latest information on the Danchuk Tri-five Nationals


Go Back   TriFive.com, 1955 Chevy 1956 chevy 1957 Chevy Forum , Talk about your 55 chevy 56 chevy 57 chevy - Belair , 210, 150 sedans , Nomads and Trucks, Research, Free Tech Advice > Wanted / WTB / Trades / Auctions/ Links to Trifive Related Sites > TriFive related Ebay auctions and Craigs List, Links to other sale sites
User Name
Password
Register FAQ Top Posters Mobile Members Search Today's Posts Mark Forums Read
HomePage Todays Post Mark Forums Read upcoming Events
Newsletter 55-56-57 Chevy Parts & Services Official Sponsors
Photo Gallery Garage Photos Trifive Classifieds Trifive on Facebook Calendar Tech Articles Arcade Oldies
Trifive Cards Car Certificate Trifive Brochure Help with Photos Website Help Videos Contact Us

TriFive related Ebay auctions and Craigs List, Links to other sale sites Post a link to a current eBay auction or Craig's List for any TriFive related content.

Parts on Ebay            
Reply
 
Thread Tools Display Modes
Old 11-13-2019, 08:51 PM   #11
557B210
Administrator & Tech Articles

557B210 has made a donation to the forum!

 
557B210's Avatar
 

Join Date: May 2008
Location: Orange Park, FL
Posts: 45,476
Member #5571
Default

Harold J. Louisiana more than likely
__________________
______________________

* See my painfully slow and overly detailed build thread here: https://www.trifive.com/forums/showthread.php?t=79427

* I have a vast data base of TriFive restoration & upgrade articles for our members' use...Send me a PM with your EMAIL ADDRESS and subject matter...See this link:
https://www.trifive.com/forums/showthread.php?t=175309


* Contact me by PM to purchase your PHR's Project X and TriFive Gasser Building CD's

_________________david aka POPS & sherry
557B210 is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-14-2019, 09:46 AM   #12
chevyman57
Senior Member 1 Blue Star



 

Join Date: Feb 2006
Location: Pinetta FL
Posts: 350
Member #302
Default X heads

Quote:
Originally Posted by 557B210 View Post
Harold J. Louisiana more than likely
your are correct thank you
Larry chevyman57
chevyman57 is online now   Reply With Quote
Old 11-14-2019, 11:25 AM   #13
BamaNomad

Trifive Leaders Club




 
BamaNomad's Avatar
 

Join Date: Mar 2014
Location: Huntsville, AL
Posts: 6,188
Member #31544
Default

Just to confirm the results of this thread, I searched for and found where John Z Hinckley replied to a question in March 2006 in the CRG board about the significance of the 'X' on heads . He said...

"A friend who has spent his entire career at the Saginaw foundry says the "X" is meaningless - just a foundry marker - on all small-block heads except the 461's, where the 461X had a 15cc larger intake port."

Those who know of JohnZ will appreciate his input.
__________________
BamaNomad(er)
'55, '56, '57 Nomads
North Alabama area
Gary
BamaNomad is online now   Reply With Quote
Old 11-16-2019, 06:30 PM   #14
ChevyGasserMadness
Senior Member 1 Silver Star



 
ChevyGasserMadness's Avatar
 

Join Date: Feb 2010
Location: Kingsville, Md.
Posts: 753
Member #12118
Default

In 62 the 327 double hump 461 X Fuelie heads were the ones to have . I believe they also were on the 340hp SHPE in the Corvette. The Fuelie cars were rated 360 hp.
__________________
"I'm Goin' the distance, I'm goin for speed." Cake
ChevyGasserMadness is offline   Reply With Quote
Old 11-17-2019, 01:12 AM   #15
Rick_L

Trifive Leaders Club




 

Join Date: Mar 2007
Location: Katy, TX
Posts: 34,064
Member #2256
Default

I'll go along with the others that said the 461X heads are the only "X" heads that were truly different from their "non-X" counterparts, at least to my knowledge.

They had about 170cc intake port volume, where all the other "camel hump" heads only had 155cc. In fact the only other production SBC iron head that had 170cc port volume was the Vortec 350 head. They were produced in 1962 and 1963 on 327 engines that had the 300, 340, and 360 hp ratings. They did not have the 2.02/1.60 valves though. The heads were sought after for NHRA racing in the Modified and Comp classes that required a straight plug iron OEM head in the 70s and 80s, and didn't allow anything but bowl porting. I ran such a class, and spent a fair amount of time looking for some. They were worth about .15-.20 et on my dragster.
Rick_L is online now   Reply With Quote
Old 11-17-2019, 09:55 PM   #16
ChevyGasserMadness
Senior Member 1 Silver Star



 
ChevyGasserMadness's Avatar
 

Join Date: Feb 2010
Location: Kingsville, Md.
Posts: 753
Member #12118
Default

Quote:
Originally Posted by Rick_L View Post
I'll go along with the others that said the 461X heads are the only "X" heads that were truly different from their "non-X" counterparts, at least to my knowledge.

They had about 170cc intake port volume, where all the other "camel hump" heads only had 155cc. In fact the only other production SBC iron head that had 170cc port volume was the Vortec 350 head. They were produced in 1962 and 1963 on 327 engines that had the 300, 340, and 360 hp ratings. They did not have the 2.02/1.60 valves though. The heads were sought after for NHRA racing in the Modified and Comp classes that required a straight plug iron OEM head in the 70s and 80s, and didn't allow anything but bowl porting. I ran such a class, and spent a fair amount of time looking for some. They were worth about .15-.20 et on my dragster.
To add ...they were a must in the Corvette judging world of NCRS for the 62 SPHP and Fuelie cars.
__________________
"I'm Goin' the distance, I'm goin for speed." Cake
ChevyGasserMadness is offline   Reply With Quote
Old 11-17-2019, 10:30 PM   #17
Rick_L

Trifive Leaders Club




 

Join Date: Mar 2007
Location: Katy, TX
Posts: 34,064
Member #2256
Default

Yes, in a way, that's because they were the only date correct "camel hump" heads in 1962 and 1963. "Plain" 461 castings didn't exist until the 1964 model year.

But, how is an NCRS judge going to see that on an assembled engine? You can't see the date code or any relevant casting marks with the head on the engine and the valve cover on the head. Even with the valve cover off, you can't see the "X" designation - but you can see the date code.
Rick_L is online now   Reply With Quote
Old 11-18-2019, 08:20 AM   #18
topdog
Senior Member 3 Gold Stars



 
topdog's Avatar
 

Join Date: Sep 2010
Location: Northville michigan
Posts: 3,897
Member #15087
Default

Quote:
Originally Posted by ChevyGasserMadness View Post
In 62 the 327 double hump 461 X Fuelie heads were the ones to have . I believe they also were on the 340hp SHPE in the Corvette. The Fuelie cars were rated 360 hp.
I have these double hump heads on my 55 with big valves and ported, but they don't compare to some of the new head designs for power
Attached Images
File Type: jpg IMG_0442.jpg (949.2 KB, 4 views)
topdog is online now   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:29 PM.

Click here to see our full list of sponsors for all your Parts and Restoration Needs

Websites
www.tri-5.com www.tri-fives.com www.trifive.com

Powered by vBulletin
Copyright 2000-2009 Jelsoft Enterprises Limited.
1957 CHEVROLET BEL AIR Information, 1957 CHEVROLET BEL AIR Specifications, 1957 CHEVROLET BEL AIR Resources, 1957 CHEVROLET BEL AIR Pictures, 1957 CHEVROLET 55 chevy 56 chevy 57 chevy 1955 55 chevy pictures 55 chevy parts 55 chevy truck 55 chevy pickup 55 chevy nomad 55 chevy gasser 55 chevy pro street 56 chevy pictures 56 chevy parts 56 chevy truck 56 chevy pickup 56 chevy nomad 56 chevy gasser 56 chevy pro street 57 chevy pictures 57 chevy parts 57 chevy truck 57 chevy pickup 57 chevy nomad 57 chevy gasser 57 chevy pro street 55 chevy photos 55 chevy parts 55 chevy truck 55 chevy pickup 55 chevy nomad 55 chevy gasser 55 chevy pro street 56 chevy photos 56 chevy parts 56 chevy truck 56 chevy pickup 56 chevy nomad 56 chevy gasser 56 chevy pro street 57 chevy photos 57 chevy parts 57 chevy truck 57 chevy pickup 57 chevy nomad 57 chevy gasser 57 chevy pro street 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad belair Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five belair Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 belair chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy belair 57 chevy 1955 Chevy belair 1956 Chevybelair 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy belair 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five belair Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy belair 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy belair 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five Tri5 55 chevy 56 chevy 57 chevy 1955 Chevy 1956 Chevy 1957 Chevy Bel Air 210 150 and Nomad Tri-5 Tri-five 55chevy 55 chevy pictures 55 chevy parts 55 chevy truck 55 chevy pickup 57 chevy 55 chevy nomad 55 chevy gasser 55 chevy pro street Searches related to 57chevy 57 chevy pictures 57 chevy 57 chevy truck 57 chevy parts 57 chevy pickup 57 chevy nomad 1957 chevy Tri5