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Now for something different, a Pontiac OHC L6

  
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Now for something different, a Pontiac OHC L6

 
TheSilverBuick TheSilverBuick
Guru | Posts: 1220 | Joined: 02/06
Posted: 11/18/10
02:52 PM

Because this places needs the occasional new thread, I thought I'd post this here too.  

I picked up a 1969 4.1L Pontiac overhead cam inline six.  I want a '69 Firebird, and since I have two big block Buick's and a 428 FE powered T-bird I could go smaller with the Firebird.  Since I don't have the car yet it means I can spend some time and money on the engine first Grin

For those that don't know, Pontiac made these engines for four years, from the '66 model year to the '69 model year.  They made more power than the Chevy straight sixes and ran at least 1,000rpm higher.

So some pictures, if you know the Chevy inline six, some parts will look familar.

The intake/exhaust side.
75605 1639150932309 1042835976 31720251 6960748 N

The MIGHTY one barrel carb :P
76264 1639153852382 1042835976 31720256 1872183 N

A 1969 4.1L Code. The Date code says December 1968.
75186 1639154372395 1042835976 31720258 2375199 N

148341 1639154812406 1042835976 31720260 3842314 N

The accessory side.
148521 1639155452422 1042835976 31720262 5956465 N

What paint scheme to go with eventually?
149516 1639156132439 1042835976 31720264 3434384 N

The accessory block driven by the timing belt. Has the Distributor, Oil and Fuel Pumps.
149204 1639156532449 1042835976 31720266 935151 N

You can see the slots where it bolts up, it's how the timing belt is tightened.
154289 1639156972460 1042835976 31720269 7106732 N

The Pontiac has a deeper skirt block, surrounding the main caps compared to the chevy for more strength.
150595 1639157532474 1042835976 31720272 3232549 N

Oil's full, engine turns easily.  I think I'll pull the distributor, get a drill and test the oil pressure.
155484 1639158252492 1042835976 31720275 6313691 N

Big Ol' Cam Sprocket.
149648 1639158612501 1042835976 31720278 6305501 N

The Accessory drive sprocket.
76632 1639159092513 1042835976 31720280 4606924 N


My plan is to rebuild it for some boosted high rpm action Cool Get the crank perfectly balanced, some light weight forged pistons, aftermarket connecting rods, then make up an intake and exhaust for a turbo and multiport fuel injection.

I should start tearing into it some time after Thanksgiving.  
-
The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. '69 Firebird replaced!

http://www.bangshift.com/forum/index.php?topic=6189.0

460-BBF-Turbo-In-CC 460-BBF-Turbo-In-CC
Guru | Posts: 1163 | Joined: 10/03
Posted: 11/18/10
04:43 PM

Cool!

I've got a Pontiac Sprint 6 engine (OHC 6 with a factory Quadrajet and split exhaust manifolds) that may go into a HAMB-style '64 Biscayne one of these days. I was thinking turbo as well.  It'd be fun to whip on some 409s with it.

Keep us posted. I look forward to seeing your build.  
--------------------------------
460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005
-------
October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power."
-------
"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

ERIK427 ERIK427
Enthusiast | Posts: 279 | Joined: 11/09
Posted: 11/18/10
06:06 PM

Love the motor! I've used this motor as a example many times in the famous OHC vs OHV debates. Although I can't think of them, there are web sites for this motor. A small turbo would be perfect.  

gettnlarge01 gettnlarge01
Guru | Posts: 1505 | Joined: 11/09
Posted: 11/20/10
04:22 PM

being different is good,,,,  
luck is when skill and opportunity meet

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 11/21/10
08:17 PM

I can dig it!  Cool  My first car was a 66 Tempest Sprint.  
idrivejunk

gettnlarge01 gettnlarge01
Guru | Posts: 1505 | Joined: 11/09
Posted: 11/22/10
04:41 PM

my first car was a truck,,lol  
luck is when skill and opportunity meet

460-BBF-Turbo-In-CC 460-BBF-Turbo-In-CC
Guru | Posts: 1163 | Joined: 10/03
Posted: 11/23/10
08:02 AM

Idrivejunk, I've owned a 370 h.p. 1969 Grand Prix SJ since 1981.  I orginally bought it because it was about $1,000 cheaper than a GTO and it was a sleeper to most of my less knowledgeable cohorts. And it handled better than my old GTO-powered LeMans Sport(which had sustained some body damage).

I keep hoping these alternative muscle cars will catch on some day. They've got a better weight distribution than even a Gen I Monte Carlo (which has more engine setback than a Chevelle, GTO, Skylark, 442 etc.).

Unfortunately, most muscle car books overlook these cars, probably because (1) perceptions of them are tainted by the slow and heavy "smogger" Grand Prixs of the mid '70s; 2) their neo-classic styling doesn't have very many '60s muscle car styling cues; (3) they've got a limited competition heritage.

But there has been the occassional racing GP . . . .

195
Vintage NASCAR 1969 Grand Prix (Built and driven by Roy Tyner, Restored by Keith and Joyce Vrabec)

Still the '69-'70 Grand Prixs (and to a slightly lesser extent, the '71-'72 GPs) remain one of the best values in "overlooked" muscle.  
--------------------------------
460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005
-------
October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power."
-------
"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

gettnlarge01 gettnlarge01
Guru | Posts: 1505 | Joined: 11/09
Posted: 11/24/10
03:43 PM

+1  
luck is when skill and opportunity meet

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 11/25/10
05:51 PM

+2! And they have tons of room for turbos, huh? I traded a Ventura II for mine. (Model J, 455 swap)

IMG 6246  
idrivejunk

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 11/25/10
05:54 PM

Heres the OHC Sprint6 car. I sure miss it. SilverBuick, good luck finding your Firebird home for the sixer. Post updates!  Cool

1966Pontiactempestsprint6  
idrivejunk

TheSilverBuick TheSilverBuick
Guru | Posts: 1220 | Joined: 02/06
Posted: 12/01/10
10:17 AM

I'm working on getting the engine to my basement for disassembly. It is currently residing at the top of my basement stairs and I hope to have it in the basement tonight.  
-
The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. '69 Firebird replaced!

http://www.bangshift.com/forum/index.php?topic=6189.0

ERIK427 ERIK427
Enthusiast | Posts: 279 | Joined: 11/09
Posted: 12/03/10
10:47 PM

Bolt on a side mounted Roots style blower. Also, I bet you could find all kinds of bore and stroke combos. Maybe a stroker motor?  

TheSilverBuick TheSilverBuick
Guru | Posts: 1220 | Joined: 02/06
Posted: 12/06/10
08:32 AM

Icon QuoteERIK427:
Bolt on a side mounted Roots style blower. Also, I bet you could find all kinds of bore and stroke combos. Maybe a stroker motor?

LMAO!  I did this as a joke, but rest assured it'll be turbo'd before all is done.  I also have a 292 crank to try in it.  But I've been chatting with folks who spin their small block chevy's to 8100+rpm and it sounds like I may have an issue with stroke and cylinder filling if I want to see those, and then some, rpm.  Though boosted is a bit different beast. I'll be test fitting the 292 crank anyways.

L 70741Ec5be8f4d86997e08c07302d4aa

L 6E702b63db684cd2ad0dde0b5caf9bcc

L E694b3c65f4d46edb2f8287c19307f7c  
-
The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. '69 Firebird replaced!

http://www.bangshift.com/forum/index.php?topic=6189.0

ERIK427 ERIK427
Enthusiast | Posts: 279 | Joined: 11/09
Posted: 12/06/10
01:32 PM

Still a very cool motor, my uncle says they run like a well built small block.  

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 12/07/10
05:41 PM

Buick, thats hilarious. LMAO  Laugh  
idrivejunk

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