496ci revamped

Speedlink1973 said:
I believe it is a Chinese intake,
I say this because the intake doesn't seem to have the USA badge as the rest of new
Intake manifolds do.
Click to expand...
Its pretty bad right now.
Be sure to test fit the intake soon on your engine to make to it lines up correct.

Only 1 guy I know for sure making an all USA made top end kit for a Pontiac V8.
DCI Don Johnson. Top notch. $20K his top end RA5 package with custom headers by him.
Can make over 1000 HP pump gas. 1400 HP Race gas.
wish I had the $20K I would buy it.

Using Vintage Pontiac iron best ever factory made with modern racing parts hidden inside.
Big Nitrous hit for 400-500 Hp more.
 
This tells it all
Assembled in the USA from foreign and domestic parts
 

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Maniacmechanic1 said:
Unlike past Edelbrock quality.
Ports off from gasket alot.
At least no major core shift.
All China parts famous for that.
Nightmare today unless you buy the very best racing parts for 700 -1000 + HP.
Click to expand...
Nice thing is I can polish it up nicely
With no fuel in the runner just air
The gasket that came with kit doesn't match heads very well, so I bought large oval port intake gaskets from AFR
Being they're AFR heads, they match perfectly to heads
 
Speedlink1973 said:
Nice thing is I can polish it up nicely
With no fuel in the runner just air
The gasket that came with kit doesn't match heads very well, so I bought large oval port intake gaskets from AFR
Being they're AFR heads, they match perfectly to heads
Click to expand...
Go down deep as you can reach. At least 1-2 inches.
Not worried about port velocity.
Drag WOT power at track.
Have Drag Gears in diff now too.
 
I have a question.

Do you think spacer under throttle body will help on EFI?

I'm guessing not being fuel is being shot
Right into the intake , and no fuel is being mixed in plenum
 
larger intake manifold plenum volume TENDS to allow higher rpms
throttle body efi acts like a carb, as the injectors dump fuel/air in the plenum
throttlebw2.jpg


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throttlelbw2.jpg

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vgd5.jpg


0412em_18_z+cylinder_head_porting+.jpg

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direct port fuel injection has a separate, individual fuel injector feeding each cylinder, the plenum essentially runs mostly dry air free of fuel

directportd.png
 
yes Id agree the use or non-use of a throttle body spacer,
under the throttle body on a direct port injection intake,
should NOT have a major effect on the engines power band or fuel/air ratio.
will a spacer placed under the throttle body,on a direct port injection intake,
in theory increase the plenum volume and thus the engines rpm potential,
yes... but not the fuel/air ratio or low and mid rpm power by much if anything/
 
Grumpy said:
yes Id agree the use or non-use of a throttle body spacer,
under the throttle body on a direct port injection intake,
should NOT have a major effect on the engines power band or fuel/air ratio.
will a spacer placed under the throttle body,on a direct port injection intake,
in theory increase the plenum volume and thus the engines rpm potential,
yes... but not the fuel/air ratio or low and mid rpm power by much if anything/
Click to expand...
Thanks Grumpy,
 
Speedlink1973 said:
I have a question.

Do you think spacer under throttle body will help on EFI?

I'm guessing not being fuel is being shot
Right into the intake , and no fuel is being mixed in plenum
Click to expand...
Grumpy answered.

My 2 cents is sometimes a spacer helps other times not.
Probably will help in your Camaro.
It's a Big cubic inch engine your trying to feed and your Drag Racing.

A Wilson or High Velocity Billet 1 or 2 inch spacer I would try and Open spacer style.
Has to all fit under the hood of your Camaro.
Want a K&N Filter at least 3 inches tall.
5-10 inches better.
Cowl is low so limited to what fits unless you use a 5 inch Cowl Induction hood or a Ram Air Hoodscoop.
Pro Stock style best.
Cuts down on visabilty driving a Big scoop.
 
Pontiac Guys have issues trying to feed big cubic inch Stroker engines proper too.
480-535 ci.
No Room unless you have a GTO A body or an early Pontiac Widetrack 1959-64.
 
Big Hole in the hood cut out.
Rain an issue.
Never solved water entry.

Only Pontiac Factory Ram Air or Shaker hood scoop solves.
Not going to work on your 1st Gen Camaro.
 
I bought a e-book of David Vizard's
Just to read when I'm board,

I found my build almost to the tee
More so with the new fuel injection
My heads a bit better 290cc to 280cc trick flow ( which are close enough to the same flow wise)and my cam with 1 degree duration on intake more and 3 degrees on exhaust my lift is a bit less @ .635 .640 11.2:1 to one compression
Edelbrock pro flo fuel injection only difference there is mine is a newer version.
But maybe read this and look at rocker arm geometry, am I reading it correctly?
1.96:1 and 1.79:1?
Grumpy,Brian I have the ability to make changes now being on on vacation starting next week.
Rock arm geometry seems odd. Screenshot_20190324-072642_Google Play Books.jpg
 
yes that rocker ratio will not be close to stock,
stock ratio is 1.7:1 , higher than stock rocker ratio,
it WILL increase stress on the valve train,
it WILL cause more wear over time and the higher lift MAY require a different valve spring and,
it WILL require a bit of carefully checking on the clearances.
higher lifts can produce minor boosts in power,
but generally the gains are in the 10-16 hp range and the cost is lower long term durability.
generally swapping to a cam with a couple degrees different duration, or in LSA,
will produce similar results

drawsdf.jpg

https://www.jegs.com/i/Comp+Cams/24...MIvtyquvSa4QIVAR6tBh1-gw8_EAQYAiABEgIu2vD_BwE


http://www.superchevy.com/how-to/engines-drivetrain/sucp-0202-rocker-arm-ratio/
 
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Speedlink1973 said:
I bought a e-book of David Vizard's
Just to read when I'm board,

I found my build almost to the tee
More so with the new fuel injection
My heads a bit better 290cc to 280cc trick flow ( which are close enough to the same flow wise)and my cam with 1 degree duration on intake more and 3 degrees on exhaust my lift is a bit less @ .635 .640 11.2:1 to one compression
Edelbrock pro flo fuel injection only difference there is mine is a newer version.
But maybe read this and look at rocker arm geometry, am I reading it correctly?
1.96:1 and 1.79:1?
Grumpy,Brian I have the ability to make changes now being on on vacation starting next week.
Rock arm geometry seems odd. View attachment 11849
Click to expand...
In case you have noticed Grumpy and Me are each Biased some or alot.

Grumpy has followed alot of David Vizzards recipe modified a bit by him.
Comes with the territory as he is a retired mechanical engineer.
And he likes Road Race durability.

I have followed and used David Vizzard tech too.
An ancient article I don't think is online.
He used to write for Dirt Track short track oval racers.
Mighty Mouse 454.
Put Titanium metal into the T/A way back.
Working on my old Trans Am today again.

High Ratio Rockers can work 1.9 :1. Only Recommend Crower Enduro Stainless steel.
The arc Geometry is Best and not matched by anyone and also cost the most.
Only can be shown on a full assembled engine and proven final racing.

Shaft Rockers more popular today.
Best like Jesel and Crower will cost $2,000 or more on popular V8s.

Winning edge when you want need it.
Step up and pay. No way around.
 
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