Another Pontiac V8 Found and Brought Home 1970 Firebird Espirit 350

what many guys fail to understand is potential for detonation damage,
you put 10 lbs of boost on an 11:1 compression engine,
and youll be looking at expensive metallic scrap, eventually,
unless your running methanol and/or 115 octane fuel mixed with alcohol
and a damn good lubrication and cooling system,
and an ignition controlled or limited with a knock sensor
 
E85.
Grumpy said:
what many guys fail to understand is potential for detonation damage,
you put 10 lbs of boost on an 11:1 compression engine,
and youll be looking at expensive metallic scrap, eventually,
unless your running methanol and/or 115 octane fuel mixed with alcohol
and a damn good lubrication and cooling system,
and an ignition controlled or limited with a knock sensor
Click to expand...
E85 Grumpy.
Methanol.
VP Q16 with Nitromethane.
 
Can't
Grumpy said:
what many guys fail to understand is potential for detonation damage,
you put 10 lbs of boost on an 11:1 compression engine,
and youll be looking at expensive metallic scrap, eventually,
unless your running methanol and/or 115 octane fuel mixed with alcohol
and a damn good lubrication and cooling system,
and an ignition controlled or limited with a knock sensor
Click to expand...
Cant use a knock sensor and count on it with High Boost.
Knock sensors always shut off turned off.
 
Pretty Good results Single ancient Turbo and 10lbs boost only.
Bench Racing Fun.
Got the basic cam profile to work with.
It's an Isky 108 LCA.
High Boost needs 114-124 LCA I know.
 

Power output is right on par with Edelbrock heads on my recent DD2000 Engine simulations done.
They are old 1965-1966 421 iron heads or 1967 670 Iron heads.
I can tell by the Center Exhaust port 135 degree turn down design. And shape.
Unique to those years.
He is testing at High Altitudes because he corrects for sea level and it's 504 Hp output from his iron headed Pontiac 350.
Impressive.

Something most guys don't understand is the fact huge flowing ports does not mean 100% of the flow potential enters the cylinder.
400-500 CFM port may deliver only 200 CFM into the engine.
Velocity not there.
And combustion chamber profile shape is key. Close guarded by top pro head porters and near impossible to duplicate unless your a Pro Head Porters too..all done by hand grinding.

Got a set of 1965 421 Heads I hung onto.
Knew they are good ones !
 
I ran my own Engine Simulation tonight Grumpy with my Trans Am.
Made an airflow file like I did for Speedlink last night with his 496.

The last engine was alot more powerful than I thought.
Just shy of 600 Hp.
Race cam Isky.
I knew it was Powerfull !
I Just did not know exact...felt like way more than 500 Hp prior to Isky.

It wants my 1050 Bo Laws Carb.
Dual Plane RAIV intake Ok yet...
Single plane used I right below the 707 Hp Hellcat.!

My heads actually flow a bit more than published online.
Recall peak numbers and lifts.
But not entire curve.
Lost the Paper printout when I had the RAIV heads tested by a Pro in Chicago 2004.

Used Rons Pontiac website for airflow specs RAIV @ 12 inches water depression.
DD2000 has different test depression levels and 12 inches selected used.

Don't need much emergency power NOS!
Small kicker only.
1050 CFM Pro Flow Bo Laws I got and 4.30 gears installed for Drag !
 
Not peaky also Grumpy.
Wide power band spread out.
468 ft/lbs @ 2000
502 ft/lbs @ 2500

With 800 CFM SD455 Q-jet I used with factory RAIV aluminum intake...
Old Engine combo .
 
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Pictures with the valve covers off the 1970 Pontiac 350 the seller sent me via Text last Sunday morning.
Pretty clean for 50 years old so I knew it was a Good Engine yet !
Usually bucket fulls of sludge in old engines !
 
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Its a 1965 Pontiac 326-389-421 Flexplate.

I can tell by the Robin Blue paint.
Has large Turbo 400 13 inch converter pattern.
And has the smaller Powerglide- TH350 12 - 10 inch conveter bolt pattern.
Turbo 350 came out in 1967 & Buick engineered it & had it 1st.
1965 was the 1st year of the Turbo 400 in Pontiacs, last year of the Robin Blue Pontiac Paint. 1966-1970 was Silver metallic blue.
It was hooked up to a ST300- Pontiacs own version of the Powerglide, witness marks there. 326 or 389 engine.
421 only used the TH400.
TH400 was not used in Tempest GTO till 1967 year.
Has the 4 lightning holes on outer edge one corner for 6 inch ounce asymmetric weight offset balance like stock.
$20 bucks only off of ebay.
No stripped or damage ring gear teeth.
See if I can get the Pontiac 350 running soon again in my spare time. Should live again easy.
 
Going to reuse the stock 1970 RAIV aluminum intake for now again on the TA Grumpy.
I will be well into the 600 HP Range this time around.
I have a a rare single plane intake I bought maybe 5 years now put away.
Early Edelbrock Torker the original for a Pontiac V8.
Its needs full race porting to work on my 1970 RAIV heads but the stock shaker fits.
I am going to hire the very best I know of.
Chad Spiers to Race port the intake.
Hopefully be close to 700 HP all motor then.
 
Grumpy said:
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https://www.jegs.com/p/Edelbrock/Ed...MItb3UnfKR4gIVhEsNCh0aIQTeEAAYASAAEgLDovD_BwE

I've repeatedly found this intake with a 750-850 cfm holley, to produce rather impressive results
on several 400-428 pontiac engine builds,
obviously you need the required hood clearance to use it,
as its a couple inches taller than most stock pontiac intakes
Click to expand...
Can't use.
Won't fit.
Got the real RAIV Shaker I talked about years back with you.
1 year only.
1 engine. 1970 RAIV.
Probably worth $10k alone now.
Got it from a Pontiac bud in New York.
Paid alot of $$$$ for it.
Snuck it by the wife.
 
Last edited by a moderator:
Mainly the plenum volume needed Grumpy single plane.
800 -1085 com BLP Bo Laws gives 33% alone.
May do for a while.
It's that BE Sale in powerbamd.
Every little bit helps WOT.
 
Said 1050 prior. It's a 1085 Pro Flow model I bought.
More to account for displacement wet flow actually the engine sees.
 
There might be a way to use a Victor.
Take it and Saw it right at the Runners to flange.
Cut angle as required.
TIG weld it back together.
Just plenum volume needed for 700 Hp + NA.
Be up there in Rpms anyhow and I have Ti parts.

That Crosswind is a POS.
Actually lose 40-50 Hp over a dual plane.
And every one sits lopsided on a Pontiac V8 and No ports line up.
China Shit garbage.
 
Wont know if possible without looking at a Pontiac Victor close up in person myself.
Compare to my stock RAIV piece.
4500 model Victor Intake should have largest plenum volume. TIG on a new top for 4150 1085 BLP.
 
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