400ci small block fuellie heads which cams should be used

well? was that what you were hoping for/ was there any major issues you need resolved
have the problems you had earlier been mostly resolved?

the HP & torque curve lines don,t look to be crossing at about 5252 rpm, ?????

https://www.motorauthority.com/news/1115177_why-do-horsepower-and-torque-cross-at-5252-rpm

https://www.roadandtrack.com/car-culture/a15839774/why-do-horsepower-and-torque-cross-at-5252-rpm/
One horsepower is equal to 33,000 foot-pounds of work per minute.
Add in the equations relating to torque and velocity,
and you'll find that horsepower always equals torque multiplied by rpm, divided by 5,252.

Good eye Grumpy. Is it because his graph mixes US and metric units of measurement -> TQ is in NM? I'm not sure.
 
Hi grumphys

Yes no more " rattling " engine...
And no more pinking.
No more bad electrics ( you should see the bulbs glow, you need welding goggles now)
Engine cuts straight away when you cut the contact...
The 5250 is where we " cut" the measurement.
We need a better carb setup and ignition timing...
When I my gonna do that....
Oh rear axle starts to make noise now.
Did I mention I bought a camper with a 440 mopar!!!

Keep at it Arjen!
 
Good eye Grumpy. Is it because his graph mixes US and metric units of measurement -> TQ is in NM? I'm not sure.
We had a simular discussion yesterday on the dyno 5 measurement ( in sae hp) and the measurement on our dyno ( in din hp).

Anyway. Drove way over the legal speed limit yesterday.
The rear tyres have worn enough to a layer way they have way more grip.
 
Yes.
This car is greatest fun I have ever had in a car....
The whole process of building our " own " engine and the 310 bhp....
So

What is next....


I own a 1969 gto
A 1975 c10
A 1985 c10
A 1979 440 mopar camper

Who has any ideas????
Because I wanna keep on doing this!!!!
 
1969 GTO With A Full Pontiac V8.
DCI RAM AIR 5 HEADS PORTED TO FLOW 550 CFM INTAKE @28 inches water depression.
Pump gas Boost 2000 Hp.
Methanol 4000 hp
 
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Good this is the New plan!!!
My pontiac has got 067 heads on.
I have just bought a couple of 48 heads.
We will Ram 3 our engine!!!
 
Good this is the New plan!!!
My pontiac has got 067 heads on.
I have just bought a couple of 48 heads.
We will Ram 3 our engine!!!
If you build True to Ram Air III 400 specs you can use cast pistons.
The only engines of Pontiac to use factory forged pistons was the SD389, SD421, Pontiac RAIV, Ultra rare RA V.
SD455 .
TURBO 301.

They all had factory installed Moly top rings.
All had Thick Flash plated Chrome valvestems.
A couple of unique Pontiac Features that made them super durable.
 
I have a good grasp on both reality and experience, and dealing with machine shops,
before you jump into any project do the required research,
think, do the calcs, price parts, talk to your local machine shop,
get out that legal pad calculator and make the required inquires and phone calls
and I have to point out I have zero brand loyalty,
as an engineer Im concerned more with cost and potential results per dollar spent
Id rather build Chrysler/ MOPAR first and second gen, hemi's than any other engines
if you check carefully, on a dollar per horse power, basis,
I don,t build many Chrysler/ MOPAR engines for the same reason you probably won,t want to build Pontiac's
you can build a darn impressive BBC with significant horse power for less total cash outlay.
than a similar horse power Pontiac.
now Ive built plenty of both engines and I have no problem building either one,
if you want under 500 hp the SBC or CHEVY LS is the route most people take.
yes you could build a 500 caddy, 455 buick, or BBO (OLDS)

either more common, pontiac or BBC engine family can be built to run well,
and the BBC and pontiac engines have a great deal of potential,
the results you can expect are based partly on your checking account balance,
and the skill and knowledge of the local machine shops
but Id point out, you can find more good aftermarket parts , at a reasonable price at swap meets,
far more often for the BBC, and whats even more important,
you have a far wider selection of O.E.M. and aftermarket parts too choose from,if you select a BBC.
Id bet 3/4 of the current after market manufacturers no longer produce Pontiac V8 parts
yes you can build either engine family, but your wallet will hurt a bit less per horse power gained with a BBC,
unless you already have significant pontiac parts and GOOD QUALITY pontiac parts and,
you are willing to be limited to what those parts can provide.
theres zero doubt Pontiac made some good engines, but theres currently,
a limited and shrinking base of salvage yard engines.

pontiac
https://www.opgi.com/gto/1968/

http://www.amesperf.com/?gclid=EAIaIQobChMIgr7jy7vF4AIVEIvICh0NlAzNEAMYAiAAEgIyWPD_BwE

https://www.carid.com/pontiac-parts/?gclid=EAIaIQobChMIgr7jy7vF4AIVEIvICh0NlAzNEAMYAyAAEgIy-vD_BwE

https://www.frankspontiacparts.com/?gclid=EAIaIQobChMIlZeNmrzF4AIVEo_ICh3W6QIPEAAYASAAEgJDtPD_BwE

https://www.thepartsplaceinc.com/browse/gto-lemans


http://garage.grumpysperformance.com/index.php?threads/pontiac-performance-tips.451/#post-72464

http://garage.grumpysperformance.com/index.php?threads/409-pontiac-build.1434/#post-59379

http://garage.grumpysperformance.co...tech-you-may-not-know.11663/page-2#post-55277

https://www.pontiacdiy.com/how-to-improve-pontiac-v-8-performance-engine-block-guide/

https://www.pontiacdiy.com/pontiac-v-8-crankshaft-performance-guide/

https://www.pontiacdiy.com/pontiac-v-8-oiling-system-guide/

https://www.pontiacdiy.com/how-to-improve-pontiac-v-8-engine-performance-exhaust-guide/

https://www.pontiacdiy.com/how-to-disassemble-your-pontiac-v-8-engine/

http://garage.grumpysperformance.com/index.php?threads/a-few-pontiac-related-dynos.15309/#post-90077
 
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Good this is the New plan!!!
My pontiac has got 067 heads on.
I have just bought a couple of 48 heads.
We will Ram 3 our engine!!!
The Muscle Era Pontiac Parts are worth alot of money today.
067 HEADS worth $900 a set here.
48 RAIII Worth $1200-1500 here.

Can make more power with aftermarket heads but The Awe Kool factor is not there unless 100% Stock parts used in Publics eye.
Like Mecums and Barrett Jackson.

It's A fact.

Race engines have to Win at No Prep Drag Racing today or no one cares.
Street Racing.
On Tv Street Outlaws.

Can slip a hotter cam in your Pontiac 400 RAIII.
Tell no one.
Each RAM AIR ENGINR SERIES Have a distinctive exhaust sound note.
Too hot or to small of cam Pontiac Guys like me can tell.
 
I have noticed the trend stated on all the Facebook Pontiac, Olds V8, and Chevy Groups I am on.

Near stock people go WOW !
GO CRAZY.
MILLIONS.
AFTERMARKET ONLY RACERS EXCITED.
 
Hello,

I'm the next student and I'm currently working on the 400Ci SBC.
While I was trying to measure the timing, I ended up with a bent pushrod.
In the engine we use hydraulic lifters. I have tried to make it solid one by putting a shim on top of the hydraulic lifter.
After that we set the clearance to zero to see the actual seat to seat timing.
What we think went wrong, is that the rocker arm was set to high to compensate to zero clearance that the sleeve in the rocker arm is not long enough and the rocker arm pushed against the bolt to which it is attached.

What do you guys think about this?
How can we prevent this?

kind regards,
Simon
 
first you radically changed the valve train geometry and stock stamped rockers have slots that limit the arc of travel significantly.
I'm not surprised you bent a pushrod.
after market rockers have longer slot clearance, and yes it pays to buy a single solid lifter to check the cam timing with





 
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keep in mind the combo of the parts strength, durability, you've selected,
that result in the engines compression ,cam timing and head flow rates,
as the combo of selected parts, have a significant effect on the engines potential power and rpm range.
obviously those components must match the drive train and cars gearing.
obviously the headers and intake or induction system, either EFI or carbs also help limit or enhance the potential power.
Id suggest a 7-8 quart baffled oil pan with a windage tray




as a general rule a serious street/strip, sbc will use 4340 forged steel, rotating assembly crank,
6" rods about an 11:1 -12:1 compression ratio, and a set of heads that flow at least 250 cfm at .500 lift,
and ideally at least 280 cfm at 700 lift a decent hydraulic roller cam with a duration at .050 should be in the 245-250 degree range with a 106-108 lsa and use 1.6:1 roller rockers and a 800-850 cfm carb minimum.
(ideally a tunnel ram with efi dual throttle bodies and injectors sized to match the power range)
ideally matched to a manual trans or a 3400 rpm stall converter and a 3.90:1-4.56:1 rear differential gear in a car under 3200 lbs
including the driver
 
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