The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-22-2023, 05:52 PM   #1
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
Re: Early 327 engine information gurus?

Quote:
Originally Posted by Rods View Post
Well i just finished my 67 build and it has the 327 375 with hump heads

I added power steering and all the other bells and whistles

Ive added some pics of how i did mine maybe it will help

I mocked everything up then sent it out to powder coating

Then reinstalled everything
Woo, 375!
Quote:
Originally Posted by zicc1835 View Post
another fan of 327s this one out of a 67 truck
Great to see all the 327 love. All great looking motors. and we know how great they run
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 01-26-2023, 10:16 AM   #2
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
Re: Early 327 engine information gurus?

A car built around the 327. Game changer!!

__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 01-26-2023, 04:22 PM   #3
Accelo
Senior Member
 
Accelo's Avatar
 
Join Date: Mar 2015
Location: washington
Posts: 2,358
Re: Early 327 engine information gurus?

All double heads are not Fuel injection heads.
The same double hump castings were used on everything from 327’s 275HP and up. All double hump heads came with either 1.94 or 2.02 valves. Only the lowly 250hp and some others like the 310hp had the small valve heads (1.74). The double hump heads are not rare at all.
The 300hp also had the same casting number and double hump identifications as their 2.02 big brothers. The 300hp has the 1.94 intake valves. Only the 350hp and 365 and 375hp motors came with 2.02 valves.
2.02 heads also had the side of the chamber, nearest to the intake, machined/relived from the combustion chamber from the factory. If you retrofit 2.02 valves to these heads and do not relieve the chambers you actually cut the port flow not increase it. It's mostly old inaccurate lore from long ago lives on never be replaced.
That said I would like to see a 327 with a modern set of Vortec heads installed on it. Would be interesting to see how it would run with some better flowing heads. They would drop the compression slightly as they have 67cc Chambers not the 64cc chambers like the original heads.
If you raced an all-stock 365hp 327 and a stock truck 5.3L in the exact same vehicles the modern truck motor would be faster. The 5.3L makes way more torque. And if you installed an equivalent cam in the truck motor, as the 365/375hp 327 it would be even worse for the 327.
For the record I have a 340hp 327. It is a great motor. But GM has leaned a bit since then.
Cheers.
Accelo is offline   Reply With Quote
Old 01-26-2023, 05:04 PM   #4
mr48chev
Registered User
 
mr48chev's Avatar
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,819
Re: Early 327 engine information gurus?

327 engines are cute and worth about 50 Bubba points at small car shows but those heads won't have hardened valves seats in them and aren't going to work well with the gas we have now.

Personally I'd have to think it is rather lame to pull a good strong running engine out a car to stick one in that's only plus is nostalgia rather than practical. Build it for an older rig out of the 50's and spend the money to bring it up to snuff with camel hump heads that have had hard seats put in and a good cam = Bonus.
__________________
Founding member of the too many projects, too little time and money club.

My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
mr48chev is online now   Reply With Quote
Old 01-26-2023, 05:26 PM   #5
A1971Blazer
Senior Member
 
A1971Blazer's Avatar
 
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,227
Re: Early 327 engine information gurus?

Quote:
Originally Posted by mr48chev View Post
327 engines are cute and worth about 50 Bubba points at small car shows but those heads won't have hardened valves seats in them and aren't going to work well with the gas we have now.

Personally I'd have to think it is rather lame to pull a good strong running engine out a car to stick one in that's only plus is nostalgia rather than practical. Build it for an older rig out of the 50's and spend the money to bring it up to snuff with camel hump heads that have had hard seats put in and a good cam = Bonus.
lame or not.....it's not prudent to put a 16 year old kid in 400 HP truck....
If I wanted to wake it up, I'd cam it, stick a set of Vortec heads and matching aluminum intake...again...not for a 16 year old with little driving experience...
__________________
1967 C10 Step side
1968 C10 Step side
1970 Chevrolet K/5 Blazer
1972 Chevrolet K/5 Blazer
.............
A1971Blazer is offline   Reply With Quote
Reply

Bookmarks


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 03:52 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright 1997-2025 67-72chevytrucks.com