New Amc Guy

MellowYellowAmx said:
I’m also thinking about buying the Edelbrock Amc Aluminum heads which have are 52 cc’s and would give me a nice bump in compression and take some weight off the nose of the car.

Thanks for the advice

Shawn
Click to expand...
I know that CC290B6 Cam from the Pontiac world.
It's a good cam.
Drag Race.
Streetable.
It wants High static Compression ratio.
At least 11.25 :1.
12.0 - 13.0 :1 preferred. 110 motor Octane Race Gas.
Sunoco 110.
VP Leaded Race Fuel used. C10.
Full ignition advance.
Initial + Mechanical. No vacuum advance used.
Not a sissy Pro Tour Old man drive slow cam.
Made For Drag Race battle.
Pontiac V8 32-36 BTDC Total timing.
Want an ultra fast mechanical advance.
All in by 900-1100 Rpm.
Need lightweight advance springs to do that.
Or Vertex Mag if go that route. No springs used in Mags. Pendulum weights with precise ramps. Another topic.

Anyhow...no lazy pump gas cruise style advance.
Ultra fast advance required.

Can cruise also on streets.
3.90 diff gear works.

Depends how fast you want to go in 1/4.
Get to a point its near impossible to cruise on street unless you really do your homework.
 
My friend had a 1974 AMC AMX Yellow like yours.
But with a 360 4bbl.
727 Auto.
12-,bolt AMC rear. Posi. Think 3.55 gears.
Exact gearing not positive.
Were not drag gears but cruised and pulled nice on the streets.
Beautifully styled CAR !
 
I have engine simulations done.
I started at 9.5:1 static compression ratio.
CC290B6 Cam.
I had to use a Pontiac 400 for a baseline engine.
No AMC V8 engine selection.
I looked up the AMC 401 heads flow rates On Stan Weisse Website.
Looked at flow data. Very similar to Pontiac D- Port High compression factory heads.
Good enough to get you a baseline & run simulations.
Looked on the AMC forum for valve sizes.
Compared to Weisse Website & used Stan's W. Listed stock valve sizes. Intake 2.025 & Exhaust 1.625 ".

The higher the static compression the greater the torque band & Hp increases follow suite.

Post simulations next.
Open Large tube headers.
Single plane intake.
830 CFM carb.

Only the compression ratio changed on each.
 
s1AmpFh.png


9.50:1.
 
thank you for the help and simulations!

I know now that I need to pull my heads and cc the chambers and start exploring my options.

Measure my heads gaskets and see if a thinner head gasket or Just buying some of the Edelbrock Or Indy aluminum heads. Either way the heads will cost me $2,00o to $3,000
Or just buy some new pistons for half the cost.

But seeing exactly what I my heads are and the gasket thickness.

The heads started life as 58 cc smog era heads that have been decked at least twice.

Again than you. More squeeze and better gearing. And opening up that exhaustA7677D19-3A70-40B0-B077-5C07047EB472.jpeg465B39F2-63A9-43E8-A956-750574869513.jpeg
 
MellowYellowAmx said:
thank you for the help and simulations!

I know now that I need to pull my heads and cc the chambers and start exploring my options.

Measure my heads gaskets and see if a thinner head gasket or Just buying some of the Edelbrock Or Indy aluminum heads. Either way the heads will cost me $2,00o to $3,000
Or just buy some new pistons for half the cost.

But seeing exactly what I my heads are and the gasket thickness.

The heads started life as 58 cc smog era heads that have been decked at least twice.

Again than you. More squeeze and better gearing. And opening up that exhaustView attachment 10968View attachment 10969
Click to expand...
index.php

The C2290B6 I have used 1st hand in a Pontiac 455.
Same basic grind as the AMC but different valve lifts.
It was made for drag racing with Iron heads before aluminum heads became popular.
Still a very good cam.
Lobes last a long time.
Does not pound the valvetrain apart.

Best thing about a flat tappet solid lifter cam is there is no chance of a roller lifters ever failing and destroying the entire engine in seconds.
Reliable power.
Giving up some over modern rollers.
Costs a mint to have best Roller cam hardware race ready.
$350 -500 flat tappet solid vs 2000-5000 Roller cam cash.
 
Last edited by a moderator:
MellowYellowAmx said:
thank you for the help and simulations!

I know now that I need to pull my heads and cc the chambers and start exploring my options.

Measure my heads gaskets and see if a thinner head gasket or Just buying some of the Edelbrock Or Indy aluminum heads. Either way the heads will cost me $2,00o to $3,000
Or just buy some new pistons for half the cost.

But seeing exactly what I my heads are and the gasket thickness.

The heads started life as 58 cc smog era heads that have been decked at least twice.

Again than you. More squeeze and better gearing. And opening up that exhaustView attachment 10968View attachment 10969
Click to expand...
index.php

Someone knows how to make good welds.:)
 
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