Need help with cam selection - update cam chosen and a question.

[A34]

Hey Guys,

I have a 69 Charger with 4spd and 3.54 Dana. What cam would you recommend for a .020 over engine running stock exhaust manifolds and intake manifold. Mild port work with larger exhaust valve. I have a 800 AVS and pertronix installed in the factory dual point that has been recurved. It has a factory h-pipe with repro hemi mufflers.

It's 9.5 compression now running a thick headgasket. Debating on putting the thin steel one on to bump it to 9.9.

Just wondering what cam you guys would recommend at either the 9.5 compression or 9.9 ?

Thanks !

[Chryco Psycho]

this opens up far more question than answers
First I like the Lunati VooDoo cams they are designed for the wider Mopar lifter & take advantage of that to the fullest these tend to offer a lot of lift & breathing potential without a lot of duration allowing them to idle well & make vacuum for power brakes & still make max power .
So Solid or hyd cam , what powerband do you need to match all the other engine components , are you keeping the stock intake & exhaust manifolds  , heck lets start with what size is the engine ?
Auto or manual trans , if Auto what converter stall , power brakes or not , what size rear gear & tires , we want the engine in the powerband at highway speed .
Are you willing to swap valve springs , what valve spring do you have now , are they old or new ?

I would order the cam with 3 bolt chain , just added security , no extra cost . You will want a 112 CL with stock exhaust manifolds

[A34]

this opens up far more question than answers
First I like the Lunati VooDoo cams they are designed for the wider Mopar lifter & take advantage of that to the fullest these tend to offer a lot of lift & breathing potential without a lot of duration allowing them to idle well & make vacuum for power brakes & still make max power .
So Solid or hyd cam , what powerband do you need to match all the other engine components , are you keeping the stock intake & exhaust manifolds  , heck lets start with what size is the engine ?
Auto or manual trans , if Auto what converter stall , power brakes or not , what size rear gear & tires , we want the engine in the powerband at highway speed .
Are you willing to swap valve springs , what valve spring do you have now , are they old or new ?

I would order the cam with 3 bolt chain , just added security , no extra cost . You will want a 112 CL with stock exhaust manifolds

LOL, sorry. trying to do too many things at once. The engine is a 440 and I'm running it as described above. No alterations except the cam, so I'm wondering what cam would be best running basically a stock engine with a little bigger carb and exhaust valve. It's manual drum brakes !! Whoo Hooo !! It'll stop on a dollar bill.  It's a 4 spd with 3.54 dana and 255/60/15 tires in the rear. The engine is a new rebuild and I'm looking to hammer the dog snot out of the car. I'm not looking to cruise at highway speeds, I'm looking to drive it like I did as a knuckle head 17 year old banging gears, so I want it to perform under hard acceleration. Thanks !!! 

[Chryco Psycho]

Well the Lunati VooDoo 60303 or the bigger 60304 may fit the bill well ,
you are not concerned with converter stall at all & vacuum as much with manual brakes
My mistake I guess I missed the 4 spd part in the first post .
you could call Lunati & talk to them about your best fit , I assume you want to stay with hyd cam , & stock rockers , I still do not know where you are at with valve springs , you probably will have to match them to the cam . As I said with Iron manifolds I would go with a 112 CL not 110

[A34]

Hey Man,

Thanks for the info. I've got new springs, but forgot what brand they are. I'll check and be sure they match to the cam, or get new ones. 

[Chryco Psycho]

 

[BSB67]

Call Bob.

http://sixpacksuperbee.homestead.com/MRSIXPACK.html

[Challenger340]

just a suggestion,
make SURE of the CR with a dwnfill volume check for best results, don't get SURPRISED later.

[A34]

Hey guys,

I got a cam coming from Bob K. Here are the specs on what I'm building, what do you think?


69 Charger with 440, 4-spd, 3.54 Dana. It is iron headed with stock exhaust and intake manifolds. Running h-pipe with repro hemi mufflers.

Pistons .020 KB hyperteutectic, cast high silicon piston. The deck is .014" uncut. The head is 86.8 cc with 5 cc in the piston. the valves are 1.810 exh and 2.140 int.

Head gasket - will use a thin one.

stock rocker arms (debating on using the crane ductile iron adjustable ones)

valve job - precision multiangle with hardened seats

Carter Thunder series AVS 800 cfm

Prestolite dual point, with pertronix kit.

VALVE Springs: SINGLE VALVE SPRING W/ DAMPER, 130# @ 1.830' INSTALLED 315# @ .550' LIFT

Here's what the engine builder wants to do:

If the deck hasn't been cut it really needs to be or there could be sealing issues later on. With the pistons being .014 below the deck I don't think that the deck has been cut because this sound normal with 2.06 CD pistons. This is what I would suggest, cut the deck to square the block and no more, us a thin head gasket. Machine another set of 906's which I have here, or later heads as I have a set of 452's also. Put in the larger Exhaust valve and retain the stock size Intake valve, gasket match the heads and let it be at that, because the cam that your using is too small for any port work other than gasket matching. Also too cutting the heads about .040 will help the compression out and make the engine run a good bit better. I would like to see the head CC's be around 76 or 78 cc's with a thin gasket besides. I would do a clean up cut on the intake manifold gasket surface to make sure that it is flat and surface the intake side of the heads to match the head decking. This will make everything fit very nicely.

Engine builder thinks my 2.14 intake valve in my head is too big for the build and it needs a 2.08. Other people have said it'll be fine. The heads are new, so I'm leaning toward keeping them.

My goal is a stock appearing engine externally. I like the package. What do you guys think? Any suggestions?

[firefighter3931]

From what i understand the BobK cam builds a LOT of cylinder pressure. You might want to do cranking compression test after it's up and running to see how much squeeze it's making. It might not run on pump gas....



Ron

[A34]

From what i understand the BobK cam builds a LOT of cylinder pressure. You might want to do cranking compression test after it's up and running to see how much squeeze it's making. It might not run on pump gas....



Ron

Thanks Ron, will do. If it doesn't run on pump gas, I'm not too concerned. It gets driven so infrequently, I don't mind putting some race gas in it. The local Sunoco actually sells it for around $8/gal. last time I checked. Which is pretty convenient, maybe not as cheap as at a track.

[Challenger340]

Apologies here,
some quick calcs from what you posted for specs, puts the Engine currently, at around 9.65 for CR with the Iron Heads ?
and,
AFTER the planned Machining.....UP around 11:1 on the Iron Heads ?
as stated,
that is NOT Pump Gas territory, and WILL require not "some" Race Gas, but probably a 50/50 mix at all times ?

No matter, Compression makes POWER...period ! Hence the wider lsa and greater cylinder Pressure.

Bob K certainly needs no introduction, if he is your Builder.... or the Cam Grinder....

However, IMO
I see no problem with the 2.14 and 1.81 Valves, especially since more recent Technology holds that Increasing the INTAKE Flow against a wider lsa Cam to promote a HOTTER BURN,
actually PRESSURIZES the Exhaust Port HARDER to get it out....
because invariably the restriction is the exhaust manifolds, NOT the BB Mopar Exh Port !




 

[A34]

Thanks for the info.

I think the CR now is more like 9.45 and will be right at 10 or maybe a tad over with the specs. I already bought the cam from Bob, and the price was in line with what other folks charge.

I'll post on Moparts and see what those guys say.

[BSB67]

Bob K certainly needs no introduction, if he is your Builder.... or the Cam Grinder....

I think I have the same question...is Bob K the builder, or the cam supplier, or both?  Who's quote is in red?

Those specs are 11:1. Nothing less. Bob's cams installed as specified provide interesting valve timing that will allow more CR than conventional cam.....but 11:1 seems to much for pump gas IMO. Call him to make sure.

[A34]

Bob K certainly needs no introduction, if he is your Builder.... or the Cam Grinder....

I think I have the same question...is Bob K the builder, or the cam supplier, or both?  Who's quote is in red?

Those specs are 11:1. Nothing less. Bob's cams installed as specified provide interesting valve timing that will allow more CR than conventional cam.....but 11:1 seems to much for pump gas IMO. Call him to make sure.

I'm just buying the cam/lifters from Bob. The comments in red are from the local guy building my engine.

[BSB67]

Bob K certainly needs no introduction, if he is your Builder.... or the Cam Grinder....

I think I have the same question...is Bob K the builder, or the cam supplier, or both?  Who's quote is in red?

Those specs are 11:1. Nothing less. Bob's cams installed as specified provide interesting valve timing that will allow more CR than conventional cam.....but 11:1 seems to much for pump gas IMO. Call him to make sure.

I'm just buying the cam/lifters from Bob. The comments in red are from the local guy building my engine.

BTW,, If you are okay with using some race gas/11:1 CR, with well prepared cast iron heads and Bob's cam, the car will be capable of mid to low 12s @ 113 in good weather conditions in street trim if everything else is right. FWIW

[A34]

I'd be happy with that. Maybe if the compression is gonna be that high, I'll go back with the thicker head gasket.