Welcome to the THE H.A.M.B. forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Go Back   THE H.A.M.B. > General Discussion > The Hokey Ass Message Board

Reply
 
Thread Tools Display Modes
Old 11-01-2007, 01:52 PM   #1
RacerRick
Old School HAMBer
 
RacerRick's Avatar
 
Join Date: May 2005
Location: Toronto, Ontario
Posts: 2,742
Default '462' Double Bump head question...

The pontiac I just bought has a set of 462 castings on its unmolested 327 engine that was swapped in from a 67' car. This engine has never been apart and has been sitting for many a year.

In looking up these heads, I noticed that there seems to be a lot of disagreement on them. Especially the chamber cc's. I have listings from 60cc's to 67cc's.

Has anyone actually measured a set?

I need to know the approx chamber cc's and won't be able to tear down the engine for at least two weeks. I am going to drop them on the 350 short block I have sitting here if they get a clean bill of health. Its a basic rebuild with cast 4 valve relief flattops 0.045" down in the hole. I am aiming for mid-low 9:1 compression with a felpro 0.038" gasket. That compression should work fine with the old 327-350hp cam I have here.
offline   Reply With Quote
Old 11-01-2007, 02:07 PM   #2
arkiehotrods
Alliance Member
 
arkiehotrods's Avatar
 
Join Date: Mar 2006
Location: Northwest Arkansas
Posts: 4,168
Default Re: '462' Double Bump head question...

Here's a quote from the book, "High Performance Small Block Chevy Cylinder Heads:"

"Head History

The selection list is basically rather thin for today’s performance engines. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1.72/1.50-inch valves. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. The easiest way to reference any production head is with the last three digits of its casting number. The most famous heads are the 461 and 462 heads that offer 160-cc intake ports, 64-cc chambers, and 2.02/1.60-inch valve sizes. For years, these were coveted castings in the performance community that were not superseded until the advent of the Chevy over-the-counter Turbo and Bow Tie iron pieces. Even for many years after their introduction, the Bow Tie was considered exotic fare for street engines."
offline   Reply With Quote
Old 11-01-2007, 02:08 PM   #3
arkiehotrods
Alliance Member
 
arkiehotrods's Avatar
 
Join Date: Mar 2006
Location: Northwest Arkansas
Posts: 4,168
Default Re: '462' Double Bump head question...

From chevytalk.com

"462" – Could be 3890462, 3891462, 3990462. The 462 is one of the best flowing production SBC heads. They were used between 1962-1968 on various HP versions of 302, 327, or 350 engines. They could have come with either 1.94/1.50" or 2.02/1.60" valves, had 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's. These heads have double hump casting marks.
offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 11-01-2007, 02:10 PM   #4
arkiehotrods
Alliance Member
 
arkiehotrods's Avatar
 
Join Date: Mar 2006
Location: Northwest Arkansas
Posts: 4,168
Default Re: '462' Double Bump head question...

From carcraft.com
Small-block Chevy cylinder heads can be categorized in several different ways. One of the easiest is to group them by intake-port volume. For the purposes of this story, we will organize these heads into three categories: Category 1, 179 cc and smaller; Category 2, 180 cc to 199 cc; and Category 3, 200 cc to 220 cc. Unmolested production heads generally fall in Category 1, but not always. For this test, we've evaluated most of the popular heads. For the earlier heads, we'll refer to them by the last three digits of their casting number, as in 462 heads, which were early castings that had a 64cc combustion-chamber volume and were used on 327 and 302 engines. The later heads will be referred to by their application, such as the aluminum L98 TPI castings, the LT1 and LT4 5.7L engines, as well as the cast-iron Vortec head and the new LS1.
offline   Reply With Quote
Old 11-01-2007, 02:15 PM   #5
SinisterCustom
Old School HAMBer
 
SinisterCustom's Avatar
 
Join Date: Feb 2004
Location: METHaway, WA
Posts: 8,253
Default Re: '462' Double Bump head question...

I have a pair of these on the 350 in my A PU.....they are 64cc.....yeah, I measured...also 2.02/1.60.

Here's a great thread on camel humps...
http://www.jalopyjournal.com/forum/s...cylinder+heads
__________________
Pinstriping by Josh

Last edited by SinisterCustom; 11-01-2007 at 02:33 PM.
offline   Reply With Quote
Old 11-01-2007, 02:19 PM   #6
pittsburgholdschooler
Grenade Inspector
 
pittsburgholdschooler's Avatar
 
Join Date: Jul 2007
Location: White Oak, Pa
Posts: 178
Default Re: '462' Double Bump head question...

The Most desireable of that series is the 461 "X" castings...look at the bottom of the runner area on the head for a cast in "X"...these were used on Fuelie vette engines and have larger, smooth ports, and the smaller CC chambers...i ran these for years on 327s I ran in my Vega....
offline   Reply With Quote
Old 11-01-2007, 02:22 PM   #7
arkiehotrods
Alliance Member
 
arkiehotrods's Avatar
 
Join Date: Mar 2006
Location: Northwest Arkansas
Posts: 4,168
Default Re: '462' Double Bump head question...

The "Chevrolet Small Block V-8 I.D. Guide" says all the 462 castings were 64 cc except for the 1967 casting 3890462, which had 66 cc. That head was used on the '67 302 in Z/28s and in some 327s in passenger cars (2.02/1.6)
offline   Reply With Quote
Old 11-01-2007, 02:49 PM   #8
RacerRick
Old School HAMBer
 
RacerRick's Avatar
 
Join Date: May 2005
Location: Toronto, Ontario
Posts: 2,742
Default Re: '462' Double Bump head question...

Quote:
Originally Posted by arkiehotrods View Post
The "Chevrolet Small Block V-8 I.D. Guide" says all the 462 castings were 64 cc except for the 1967 casting 3890462, which had 66 cc. That head was used on the '67 302 in Z/28s and in some 327s in passenger cars (2.02/1.6)

This is a 67' engine - with head casting 3890462. It s a 300hp 327.

Thanks, this should work perfect, but I may use the thinner gaskets.
offline   Reply With Quote
Old 11-01-2007, 03:17 PM   #9
Homespun91
Old School HAMBer
 
Homespun91's Avatar
 
Join Date: Jul 2006
Location: Peoria, IL (more or less)
Posts: 2,798
Default Re: '462' Double Bump head question...

I can say that the pairs of 462s I've done in the past were all (nominal) 64cc chambers....they tend to be closer to 65-66 in my experience....the two center chambers are more toward the high side of this than the outer two. Dunno why, maybe the mold guy was feeling queasy that day.
__________________
Against stupidity, the gods themselves contend in vain. - Schiller

Life's a bitch. If it was easy, it would be a slut.
offline   Reply With Quote
Reply

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 On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 01:36 AM.