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Old 08-14-2010, 10:48 PM
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Cam/Converter combo???

Here is an engine question...

I currently have a 355 small block with the following:
10.5:1 compression

Pistons KB KB 112 + .040
Rings Childs Albert + .040
Rods Eagle 6" H-beam
Timin Chain Cloys, street Roller
Oil pump Melling high volume(no pick-up)
Main bearings Cleavite 77 "P" std
Rod bearings Cleavite 77 "P" std
Crankshaft Cast steel, Skat
Damper Powerbond HP
Head Gaskets Felpro 1003
Intake gaskets Felpro 1205
Intake manifold Weiland 17530
Solid lifters
3 Comp Cam pushrods
Mr Gasket Head bolts (From Pugh)
ARP 4 bolt main bolts
One World Sportsman II head,springs,locks& seals
Head bolt washers
5 Comp Cams pushrods 7972
Roller rockers

The cam is a Lunati Cam .517/.543 lift 278/288 duration

The carb is a 750 CFM dominator...

This was mated up to a powerglide with a 4500 stall converter
....


OK, So here is my question...I want to put this motor and tranny combo in my rat rod and cruise with some more power...What Cam and coverter combo would you swap it to?And would you go with a hydraulic cam and lifters??

Looking for something that starts right up, idles decent and cruises nice with the power on tap if I need it..

Any help?

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Old 08-15-2010, 10:07 AM
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No one got any reccomendations?
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Old 08-15-2010, 01:54 PM
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You have a running engine with a cam and converter that match and it seems like a good setup. Why change anything? Just drop it in the car and go.
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Old 08-16-2010, 10:06 AM
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Quote:
Originally Posted by bigdog7373
You have a running engine with a cam and converter that match and it seems like a good setup. Why change anything? Just drop it in the car and go.
Well the current combo is geared more towards drag racing and top end power..I wanted something a bit more streetable and dependable. The current set up tends to be a bit overkill for cruising to local shows..
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Old 08-16-2010, 12:22 PM
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i have to ask this, the 278/288 that is the advertised duration right. as i would seriously expect a solid cam with a 278/288 duration at 050 would have a ton more lift atleast .620".

so then i ask what is the acutall duration of this cam at 050 cause a typicall cam with 278/288 would have around 222-232 duration at 050 and would typically have a power band of 2200ish (maybe 2600ish) to what ever. so an optimal stall speed would be 2500-3000. a 4500 stall is WAY TOO MUCH!!!

my advise for this motor and transmission if you want to put it in a cruiser car would be to keep the cam, loose the powerglide and get a th350 or th400 use some 3.73 or higher gears. this is just my opinion but to me the powerglide is a great drag racing transmission when mathced with the correct rear gears to counter act the sluggish 1st gear. but for driving on the street you wont want to use such a low gear cause you will still want to be able to drive it on the highway (at 55 or so when needed) and not run 3500rpm doing it. so you will have to use a higher gear such as 3.42-4.10 but when you match these gears to the high 1.76 or 1.82 first gear in the powerglide the car will feel sluggish. a powerglide with 3.42-4.10 gears is about the same as using a th350/400 with 3.08 gears, it will have no bottom end
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Old 08-16-2010, 12:35 PM
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Here is the actual cam spec sheet...I want to keep the glide if possible....Right now it cruises good with the old 350 and glide thats in there..I want to use the motor that I have and tranny I have, with minimal modifications..like a Cam and TQ converter..
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Old 08-16-2010, 01:03 PM
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okay so i just looked it up and it is a solid flat tappet cam with an operating range of 3000-6500, the best stall for this would be a 3500 stall. the 4500 is still way to big. i still think that this cam isn't too bad for driving on the street considering i use a solid flat tappet cam in my 385 that i use as a street stip car with similar specs, mine is touch more aggressive but it's also in a 385 and your's is in a 355 in which a motor with more cubes likes more cam. so in my opinion this cam will do fine on the street and it looks like you should still be able to run it on 93 octane. but you will want to choose a smaller converter and if you still plan to use the powerglide you will want to use 4.10's or better.

oh you mention this is a rat rod, what size tire are you running as if you are running anything larger than 30" then i would step up to a 4.56 gear with the powerglide all just so that your bottom end doesn't seem sluggish. but that is just my opinion.
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Old 08-16-2010, 01:12 PM
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Quote:
Originally Posted by my87Z
okay so i just looked it up and it is a solid flat tappet cam with an operating range of 3000-6500, the best stall for this would be a 3500 stall. the 4500 is still way to big. i still think that this cam isn't too bad for driving on the street considering i use a solid flat tappet cam in my 385 that i use as a street stip car with similar specs, mine is touch more aggressive but it's also in a 385 and your's is in a 355 in which a motor with more cubes likes more cam. so in my opinion this cam will do fine on the street and it looks like you should still be able to run it on 93 octane. but you will want to choose a smaller converter and if you still plan to use the powerglide you will want to use 4.10's or better.

oh you mention this is a rat rod, what size tire are you running as if you are running anything larger than 30" then i would step up to a 4.56 gear with the powerglide all just so that your bottom end doesn't seem sluggish. but that is just my opinion.

The tires are MT 33x19's, I think it has a 4.56 gear in the rear.....I think Ill try the converter and cam combo I have first and see where it goes..The converter may be 3500 if I recall...My dad built the motor and tranny combo..It was in my Camaro and would run 11.67@115..
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Old 08-16-2010, 01:31 PM
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Quote:
Originally Posted by Dajerseyrat
The tires are MT 33x19's, I think it has a 4.56 gear in the rear.....I think Ill try the converter and cam combo I have first and see where it goes..The converter may be 3500 if I recall...My dad built the motor and tranny combo..It was in my Camaro and would run 11.67@115..

that sounds about right
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Old 10-01-2010, 11:20 PM
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Quote:
Originally Posted by my87Z
okay so i just looked it up and it is a solid flat tappet cam with an operating range of 3000-6500, the best stall for this would be a 3500 stall. the 4500 is still way to big. i still think that this cam isn't too bad for driving on the street considering i use a solid flat tappet cam in my 385 that i use as a street stip car with similar specs, mine is touch more aggressive but it's also in a 385 and your's is in a 355 in which a motor with more cubes likes more cam. so in my opinion this cam will do fine on the street and it looks like you should still be able to run it on 93 octane. but you will want to choose a smaller converter and if you still plan to use the powerglide you will want to use 4.10's or better.

oh you mention this is a rat rod, what size tire are you running as if you are running anything larger than 30" then i would step up to a 4.56 gear with the powerglide all just so that your bottom end doesn't seem sluggish. but that is just my opinion.

Just curious, do you think this cam would work well on a 2200 stall converter on a 700R4 tranny with 488 rear gears on a 32" tire, in a 3600 lb car?
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Old 10-02-2010, 12:49 AM
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Quote:
Originally Posted by Dajerseyrat
Just curious, do you think this cam would work well on a 2200 stall converter on a 700R4 tranny with 488 rear gears on a 32" tire, in a 3600 lb car?
Not very well, 2200 stall is way too low, cam will lug at cruising speeds in OD, and the 4.88 ratio combined with the 3.06 1st gear is less then desirable, just too much multiplication, rpm drop in second gear will be excessive. If you have to run the 700R4 stay with at least 3000 stall.
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Old 10-02-2010, 01:36 PM
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Quote:
Originally Posted by ericnova72
Not very well, 2200 stall is way too low, cam will lug at cruising speeds in OD, and the 4.88 ratio combined with the 3.06 1st gear is less then desirable, just too much multiplication, rpm drop in second gear will be excessive. If you have to run the 700R4 stay with at least 3000 stall.
What do you mean by the cam will lug in overdrive at cruising speeds? please explain further..As of right now the car i have runs 2000 rpm at 60mph. Generally I never leave 3rd gear unless I get on a highway with 55mph+roads, most of my cruising is done on 35-40mph roads.
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Old 10-02-2010, 02:41 PM
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I would think the engine would buck and jump at an rpm lower than 2500 in OD with that cam, cam doesn't even start really working till then. Sort of like what you get with too low an rpm in high gear with a manual trans.
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