Thread: BBC Supercharged

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Hi guys !! whatsup!!

* I just bought few things to my 76' Camaro :
* 489 stroker
* lunati camshaft (Part#60213)
* Dart heads Iron Eagle 345cc Intake 119 cc combustion chmaber
* lunati lifters and pushrods
* mighty Demon 850 cfm
* Th 400 trans with full manual valve body

I wanna buy a supercharger but i dunno what kind of supercharger or which size ?? can u guys help me ??
and to let u know my com. ratio is 7:1 and I want to know what u guys think!!

Originally Posted by camaro76_454

Hi guys !! whatsup!!

* I just bought few things to my 76' Camaro :
* 489 stroker
* lunati camshaft (Part#60213)
* Dart heads Iron Eagle 345cc Intake 119 cc combustion chmaber
* lunati lifters and pushrods
* mighty Demon 850 cfm
* Th 400 trans with full manual valve body

I wanna buy a supercharger but i dunno what kind of supercharger or which size ?? can u guys help me ??
and to let u know my com. ratio is 7:1 and I want to know what u guys think!!

I would run a 8-71.
Or you could buy a Pro charger and use one "blow-through carb".
You will need two blower carbs if you run a 8-71.
What are your cam specs?
I also would like to know what pistons you are using and a part number to obtain a comp ratio of 7.to 1 with a 119 cc cylinder head.

the cam specs is :Retro-Fit Hydraulic Roller
duration @0.05'' 241/249
lift 625/625
lobe 110/106
RPM Range: 2600-6600
Hydraulic Roller; Serious Street/Race cam. Needs 10.5:1 compression and 3200 RPM stall converter. Works with moderate nitrous and small
superchargers. Very "Healthy" idle quality.

The Pistons are lunati D shape pistons but its comp. ratio is 7:1 with 119 cc

Originally Posted by camaro76_454

the cam specs is :Retro-Fit Hydraulic Roller
duration @0.05'' 241/249
lift 625/625
lobe 110/106
RPM Range: 2600-6600
Hydraulic Roller; Serious Street/Race cam. Needs 10.5:1 compression and 3200 RPM stall converter. Works with moderate nitrous and small
superchargers. Very "Healthy" idle quality.

The Pistons are lunati D shape pistons but its comp. ratio is 7:1 with 119 cc

The pistons you have listed are for a 4.0 stroke not a 4.25 stroke.

Oh sorry Erik i got the wrong # my pistons are not Lunati they are SRP Pistons ( #142979)

To make serious hp with a 489 and a blower you would need a 8-71 and it is not a small blower.
I would look at cams that are ground on 110/112 or 114.
I would look at a cam that favors the exhaust by about 10 degree's.
A good example would be a Comp. cam part #11-414-8.
This is a retro fit hyd. roller
The specs. are 242/254 @.050, the lift is .566/.575 on 113 l/s.
The power band is 2,400 to 6,400 it would be a little less in your 489.
I am not saying you cam won't work but there are better cams out there.

nice choice of cam Erik but is it good for street?

Originally Posted by camaro76_454

nice choice of cam Erik but is it good for street?

We have made well over 850 hp with that cam in a 496 on pump gas and 9 lbs. of boost with a 8-71.

ok what about carbs? im thinking of using 2 Mighty Demons 750 cfm . What u think?
Do I need a “pop” off valve kit?

Originally Posted by camaro76_454

ok what about carbs? im thinking of using 2 Mighty Demons 750 cfm . What u think?
Do I need a “pop” off valve kit?

I would run twin 850 carbs for blown applications.
No you don't need the "pop-off valve" but I would run the aluminum blower studs.

871 is good but a 671 would do . like the bm sealed blower this would have to do with what you are going to do with it and 750 carbs work good i have a548 with a bm mega and it works just fine with two 750 i have never had any one say it would run better with a bigger blower or carbs when it spinning the tries off in 3 gear when it run in to booost but if you are going balls out then yes put the big blower on and big carbs but you will have to find away to hook it