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  #1 (permalink)  
Old 04-04-2008, 07:13 PM
Rob Keller's Avatar
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Question Pontiac Questions.

Hey Y'all

Well I got me a addition to my junk pile.

A 75 Grand LeMans
350 2 bbl {Pontiac}
Turbo 350
Not sure what the rear gear is.

Well the car has 207 ,000 miles on it & it has a miss.

I hope to get it on my buddies scope tomorrow

I put plugs in it & it seemed a bit better but I am leaning to-wards a Cam & lifters plus the other stuff timing gears & chain.

So if I must do some top end work I have a few Questions

I want to put a 4 bbl on it I located some 6X heads .

What would be the best cam for this ?
{Crane Fireball?}

I'm not racing it just want to cruise & have some get up & go when needed.

~? What is the difference between 6 X heads & 7 L 's?

~? can I use the 6 X heads on the 350?

I noticed the 7's had no end exhaust manifold bolt holes & visually the intake valves looked larger {not sure}


Thanks


Rob

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  #2 (permalink)  
Old 04-04-2008, 07:42 PM
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Hey Rob I have an old 82 corvette motor I would probably be willing to trade for that..
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Old 04-05-2008, 04:12 PM
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For What the worn out cam?

Your on!

You can have the lifters too.

I need this thing to quench my Gas thirst driving that dualie as a daily is killing me.

Find me a 71 LeMans & its a deal its gotta be solid Running would help too .

Am I going to have to go to the Pontiac site ?

You know I don't wanna!

Or am I just on everyones ignore list?




R
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Old 04-05-2008, 04:33 PM
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Ha! You know I am just messing around.
You know come to think of it...There is not a lot of Pontiac talk around this place..
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Old 04-05-2008, 06:44 PM
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pontiac head codes

6x heads are like 114cc's. they only work with 455's. your little 350 will have like no compression at all with these junkers. sell them to a guy with a 455.
another thing is that 350's are just not going to get you anywhere. sorry. they are the same size block and internals as a 400 so get one or else go to a pontiac race parts site and buy a whole 383 pontiac stroker rotating assembly for some $1700. can get some 72cc chamber e-heads. building pontiacs takes alot of money. just ask me why i have two engines still sitting in pieces.

i did some c.r. calcs for you with a bore of 3.875 (stock) and a stroke of 3.75, flat tops with 6cc valve reliefs, .39 gasket, .030 in the hole your c.r.is like 6.4:1. i don't know if it would even run. that is also with 114cc chambers. you definitely need different heads. i think jim butler performance is in alabama or something but florida has tomahawk performace parts i believe. no, they are in cali, you want www.krepower.com, no they are in ohio. www.sdperformance. com is in bc canada. hmm.
http://www.jbp-pontiac.com/ is in tennessee

i know there is somebody down there. hey don't feel bad. i spent $400 on some ported 4x heads and $200 more for the port matched intake. fortunately they were "only" 98ccs. But i got them for my 400, and it would send my c.r. down below 8:1, so they were useless!! now i have to save them for my 455 build

the 6x's had different sized chambers as well. look for the smaller chamber with a number 4 stamped on a boss just to the upper right of the first plug hole. i don't know the exact size of the chamber tho. probably 94cc's or so. the number 8 stamped there will be the 114cc chamber. you can go to the pontiac site www.performanceyears.com and search it out. good luck


hey, i couldn't help it. i had to know myself: here is a post i stole from over there which came from wallace racing.com:

6X-4 350(and 77-79 T/A 6.6), 93cc, 2.11/1.66"
6X-6 455, 114cc ? /124cc, 2.11/1.66"
6X-8 400, 101cc, 2.11/1.66"
6H-6 455, 124cc, 2.11/1.66"
6S-7 350 w/AIR, 93cc, 2.11/1.66"
6S-9 400 w/AIR, 101cc 2.11/1.66"

The 6X-4 and 6X-8 were the only heads used after 1976.

your cr will be 7.38:1 with the smaller 94cc 6x-4 head. i re-did the calcs. obviously it will be worse with a bigger chamber such as with any 4x head

and fyi, here are sum figs on the 4x head with secondary casting numbers where i told you the 4 and the 8 are stamped above:
There are 4X (1H) that came on a 455 with 114cc chambers .
4X(3H,and 7H) have screw in studs with 2.11 / 1.66 valves.
4X(4H) and 4X(3H) went to screw-in studs begining castings around May7th,1973
4X(3H,4H,7H) have 98 cc chambers.

and now you know..... the REST of the story. well, at least as it pertains to 4x and 6x castings anyways

i re-read your post bro. if your engine has 200K miles on it, it's time to PUNT BRO!

i guess that's why nobody responded to this post. AAAAAAAAAAAHHHHHH!

Last edited by bullheimer; 04-05-2008 at 09:13 PM. Reason: more poncho sheite than the law allows
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Old 04-05-2008, 09:34 PM
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its A GRANDMA CAR.

no really
any way I think it just needs a cam there is no ignition problem says the SUN machine .

& the timing chain is S.S.S. sloppy I can bet the farm it has never been into .

I will call the guy I got it from after reading the box of papers & stuffs

the crank bolt looked like it was missing but after some scratching I found it!

it might have jumped a tooth but I still got dome descent donuts in the parking lot {better take it easier on the old girl fer now}

Bull If I could afford that high dollar stuff Id be on it in a new york minuet .

so I guess I will get my arse over to summit & see how much a stock cam lifters & timing set costs ... gaskets too .


I wish I had all the 400's & 455's Ive had to scrap

that would make you vomit!

thanks for the killer info

Weirdbeard Id trade it for a 71 ~2 in a heart beat ,t ~37 luxury ...Sport!! I think they are some sexy looking cars even rusted out.

Slap slap back to reality




R
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Old 04-05-2008, 11:07 PM
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rob, don't even take the heads off.
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Old 04-06-2008, 12:51 PM
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I might have no choice.

I did the card /intake valve on the tail pipe test & its a popping

so I removed the dist cap to take a peek & found the HEI button was on the wrong side of the rubber washer replaced the cap & rotor next will be the wires but now

...

It will stall out when I let off the gas no power steering or brakes sucks!

its so quite I cant hear it running.

I will have to have the A/C sucked down to have enuf room to remove the cam I have to remove the condenser.

I just hope the lifter are not mushroomed too bad.




R
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  #9 (permalink)  
Old 04-08-2008, 04:37 AM
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If I pull the motor.

And want to put a 4 bbl on it what cam would you recommend?


I am looking at a complete kit because all the things wrong just keep adding up like a rear main seal leakage that is significant.

Also any other sites than Summit.

Its been a long time since Ive done a complete one.

Might see if I repair the fenders while I got it down.






R
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  #10 (permalink)  
Old 04-08-2008, 09:10 PM
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Get hold of Ken Keefer. He can help you with everything you need when it comes to a Pontiac, whether it be street only, street/strip, or race only. His website is here: http://www.angelfire.com/fl4/pontiacdude428/

You can also go here http://forums.performanceyears.com/forums/ with questions about your Pontiac build.

Last edited by WDCreech; 04-08-2008 at 09:18 PM.
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Old 04-08-2008, 11:35 PM
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i think that pontiac 350 is screamin for some closed chamber heads!
pre 65 heads can be used on a 65+ block right?
just not the other way around?
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Old 04-08-2008, 11:44 PM
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at 200k I wouldn't even dream of touching that engine unless I had a new set of rings in hand. Even if you just hit the cylinders with a hone and install some cheapo file fit cast iron rings you'll be better off. I understand the budget constraints but you can still build a decent rebuilt engine in your garage for less than a grand from soup to nuts. I won't be a brawler but it'll be a LOT better than what you got.
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Old 04-09-2008, 11:07 PM
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Quote:
Originally Posted by h0trod389
i think that pontiac 350 is screamin for some closed chamber heads!
pre 65 heads can be used on a 65+ block right?
just not the other way around?
It can be done either way, but valve angle is different between the two, and the earlier heads didn't flow as well. How ever. the '67, 670s, closed chamber heads have the correct valve angle, and you could use pop-up or dished pistons to get the desired compression. With large valves in the 670s, you'd have tou put notches for the valve, at the top of the cylinder, in a 350.

Last edited by WDCreech; 04-09-2008 at 11:14 PM.
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Old 04-21-2008, 11:46 PM
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I saw an article in an old hotrod Pontiac magazine where they tested intake manifolds, and the old pre-EGR factory Q-jet intake made more power at low rpm than a Performer, and equalled it at high rpm. The exhaust crossover on the pre-'72 intakes is not exactly compatible with the one on the later heads, but a fix is described at http://wallaceracing.com/intake-crossover.html . Or you could use a '72 intake.

Lots of good Pontiac info at www.pontiacstreetperformance.com . Click on the Service emblem, and also on "torque power" for some engine builds.
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