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  #16 (permalink)  
Old 10-30-2004, 11:09 PM
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400 vs 455

Hey Guys

I'm new to this, I hope someone can get me going in the right direction.. I have 2 engines one of them is a 400 G018 with Casting #15 heads G038. The block codes is YE which makes this engines a 340hp 10.5 to 1 compression. The other one is a 455
J192 and the block codes is YC. The heads are 4X K172. Which makes this a 250 hp with 8 to 1 compression.. In saying all of this.. These two motor are the first I have tore down to the block. Now I don't know which one to go with to rebuild. I'm restoreing a 1966 4-door bonneville which was been in the family for 38 years. I just want when this car to crank-ups peoples heads to turn and pull out on the road push the gas and the tires to light up... Hopefully someone can get me in the right direction.. I would like around 400 to 600 hp on pump gas... Is this possable... The car will be going to olded curiz and some show not on the Drag Strip...

Thanks SpeedCrazy

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  #17 (permalink)  
Old 11-02-2004, 10:07 AM
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Bullheimer,

The link below is good to confirm valve and chamber sizes for the 326-455 pontiac. I think your question might be----
Can you put a 4bbl on heads intended originally for a 2bbl and the answer is yes, in some cases, I won't say most-- the spec sizes are the comparable anyway.

http://www.angelfire.com/on/geebjen/heads.html

but yes, mine originally had a 2bbl on it. Granny motor, came out of a 65 tempest with 55k, old lady turned it into a cigarette case on a telephone pole and I bought the 326 for $150.

I have ported and polished the heads since, but I need more cubes, that's why I'm building the 400. I'm already scouting for a 455. For what it's worth----
some things you can do to make your heads "bigger"
-taller rocker studs (cheap)
-roller rockers(279)
-port/ polish(free)
-over-size valves/job (about 200 at shop)
-I have heard of guys even powder coating
to increase flow(haven't confirmed this works)
-intake /carb spacers (about 40)
you get some major fuel velocity and low end torgue from this simple/cheap trick
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Old 11-02-2004, 03:21 PM
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Thanks for the infor, I went to the web site you gave me... Ok the heads I have for the 400 engine are 75cc which came with it and the heads I have for the 455 are 114cc.. If I put the heads off the 400 on the 455 will it make to much compression for pump gas or would you even do that... The 400 engine is a 1968 and the 455 engines is a 1973...
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Old 11-03-2004, 12:51 PM
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Bull

http://www.taperformance.com/faq's.htm

Another link, I know. This explains beyond my scope, what you would need to do if you wanted to top your smog 455 off with the retro 400 heads. It's a forum that makes alot of sense once I read it. and yes, I would have had the knee jerk "no, don't do it" but this is good info. By the way, one of the concerns the forum doesn't mention about head swapping is the fact that this is not an exact science. in a word, not all 455 blocks will play with all 400 heads and vice versa. So I would do some homework and even do a dry run with the swap to make sure they play well together on the stand and even put in the valve train to check clearances. Big things to watch:
--do the lifter seats "match" the bottom of push rod.
--are you going to run roller rockers if so, do/will they match up with the hybrid push rods you will end up using
--will the gaskets lay true
--check head bolt depth on both sets to see if they match.
--make sure you have figured out how these suckers are going to get oil--either through a galley by the lifter chamber or the hollow rod (not all rods are hollow)

Last edited by tempt; 11-03-2004 at 03:25 PM.
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Old 11-10-2004, 11:29 PM
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Re: Big Block Pontiac Performace

Quote:
Originally posted by DollarDan_RoadRage
Iam bilding a 37 pontiac and i wont a big block with a blower. But i dont know anything about pontiac. so some sugestions on what engine i sould find and what i should do to it. thanks for any help
Here you go:

http://www.craigslist.org/eby/car/48545184.html
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Old 12-09-2004, 06:03 PM
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tempt, since this thread was brought back from the dead, what are the specs on your Lunati Cam? i just bought a summit 2800, which was there top of the chart cam, pretty lame, but i havent installed it yet as i was gonna just put it in with my stock 2bblheads. but if i can find 4bbl 326 heads i would be able to bump the cam up. what do you think of the 2800?
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Old 12-10-2004, 11:37 AM
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Bull,

Here is a general description:

I will access lift, duration, separation for you if you want or you can take part number and go to Lunati.com and they will spell it out for you.
Sorry, Haven't looked at the specs since april, A Lotta 400 cid water has gone under the bridge since then, don't remember 326 bump stick specs: here's the part number though and how I would describe it's use for you
o00072LK would be the cam and lifter part number for your car. This cam has a
lopey idle, will work with your transmission (assuming you still have the slim jim 2sp or th350,
(will handle converter and minor engine mods.
Price is $149 it's a great cam, great low-end torque and w/ the right richness on the secondaries, it will howl at WAT too.
... just looked at the 2800; this appears to be a stock cam replacement which is fine if you don't intend to make any mods. The whole thing here is that a bigger bump stick won't do much good without any air. Those heads gotta go eventhough you mentioned 114cc chambers, that's decent man--- I would do some research and find out the what intake/exhaust valves are and maybe upsize a little at the shop and go with those heads, put that 455, '73 you probably know was the last of the heavy hitter-455's to come out of detroit. As far as the 326 goes, I would pump it up with a better intake and cam, port the heads, then at least you could sell to an up-an-comer when you step up to the 455??

Last edited by tempt; 12-10-2004 at 12:21 PM.
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  #23 (permalink)  
Old 12-10-2004, 01:35 PM
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yeah the heads always seem to be the weak link with a pontiac. but i had a big time poncho builder say the 2bbl heads i had would be incredible when hogged out. must be because of the chamber size you mentioned. i dont even remember who it was it was so long ago. what caught my eye was you said your 326 would twist the car up pretty good. i dont have the means to get a 455, and i am using this car for daily driving, i really like the milage i am getting, i do have the stock 2 speed, but was wanting to upgrade to a 4sp auto. got any recommendations? i take it your 326 had 4bbl heads? i want it to sound like a hot rod, not a grocery getter like now, and be able to burn rubber when its not raining
here's the spec on the summit 2801:Vendor Summit
Product Line Summit Camshafts
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 2,000-4,500 RPM
Intake Duration 050 inch Lift 214
Exhaust Duration 050 inch Lift 224
Advertised Intake Duration 272
Advertised Exhaust Duration 282
Intake Valve Lift with Factory Rocker Arm Ratio 0.442
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.465
Lobe Separation (degrees) 112 . think it would run with my stock heads? it's alittle bit milder than the one you ran from Lunati, that was Lunati's top of the chart cam btw.

Last edited by bullheimer; 12-10-2004 at 01:51 PM.
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Old 12-10-2004, 02:11 PM
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Burn rubber when not raining, that's hilarious. I'm sorry, I thought I heard say you had your hands on a 455 at one time. The th700 is a great tranny w/ overdrive. You can buy one 4-about 3200 or take th400 and add your overdrive kit (4th gear) for about 2100 and it will be switch operated. Very cool option---- you essentially end up with twice as much plant at the track. Manual shift out of the hole wrap it to 4000, then hit overdrive and take to half gear in between each gear. BIG ADVANTAGE.

I have aluminized 2.5 pipes (unless you're running 500hp+ this is more than you'll ever need, don't ruin your bottom end by listening to these guys who bad-talk "back pressure"-- you need the right amount of back pressure in order to have any bottom end) and I kept the J pipes at 2.25 (better low-end torgue with a throatier sound (best of both worlds) my own recipe. Mufflers are dynomax --superturbos and my wife complains that one of these days our fish is going to commit suicide and jump out of the tank when I start her up. Shakes the sheeoot of the house (attached garage).
Bull, trust me, you can make a 326 perform just like a small block if you want. It shouldn't cost a lot of money either. The heads are the big thing.
Intake: Get an edelbrock performer RPM (the 'rpm' is the highrise performer)-- yes, it will still fit under your stock hood, but I put an aftermarket scoop on (Lund.com), with 2" spacer, more fuel velocity; that has the hood looking exactly like a goat hood for about $69--. This arrangement creates a ram-air effect. If you look down the scoop, all you see is cleaner--wham!! AIRHAMMER!! I did my own paint work. I will try to start one of these project folders sometime and include pics.
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  #25 (permalink)  
Old 12-10-2004, 04:19 PM
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my wrecker here will get me either the 200-r4 or a th700 for $250. i am trying to decide which is better, has the best gear ratios although i've heard 700's would need an adapter plate. i have no idea what my gears are but they're spiders. i had a chance to get a low cr 455 but he wanted like $450 so i passed. i would have had to get heads too. (i bought a performer already so the rpm cant happen). i also dont have headers either because my friend put thorleys/performer on his catalina and it didnt improve it much. wonder what you think of maybe trading in the 2800 for the 2801 with stock exhaust, performer, Q-jet i just scored off a '76 Olds 350, or if i should just put in the 2800. i really doubt i'll be able to change trannies before summer unless my uncle dies, and i've seen some unreal 1/4 mile times from cars with only one tire spinning. i will not be doing any headwork to my heads either other than gasket matching them, what about using the 2800 with higher ratio rocker arms?

DAMN, TEMPEST! I just noticed you only have like 6 posts and there just about all in this thread!! not much of a talker are you? that's pretty weird since you probably know alot, at least about pontiacs. loosen up bro! it's good to hear from you! i re-read your posts and it seems like you did in fact put that Lunati in the 2bbl 326 since it had a 2bbl on it stock. thats the good news. bad news is i still have this 2800 cam
also, the taperformance link doesnt work anymore

Last edited by bullheimer; 12-20-2004 at 11:26 AM.
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  #26 (permalink)  
Old 01-14-2005, 05:32 PM
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Sorry Bull,

Just changed jobs and it's kept me hoppin'. Sounds like a you gotta line on a 455. That's great, for 450 i'd snag that. They aren't on every street corner anymore---

and no, I don't know a whole lot. I just hang out with old guys who do--- and do and repeat as they tell me ))

I check out the lift on the 2801 especially if you are thinking about the scalability of your plant long term. Gently reminder---
You said it yourself, the performer, and headers won't do any good until the air is right.
#1 1.65.1 (7's might even go) srew-in studs
#2 cost 28 bucks a head to mill--- big air-- big fuel!!
#3 bigger valves- if your going to replace the valves anyway, you can get a major response from this, I'm doing it now w/ the 400 intake--1.96 to 2.11's ex-- 1.64 to 1.77's
then-- your 2801 will play big #'s with perf and headers because you'll have some wind.
-----Way Off the subject-- I just installed a gas powered 100,000 Btu airplane hanger heater in my garage Whoo Haa!! it was 11F last night and 69.4f in my garage. I took off valve springs in my socks!! this thing's a monsta!!
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