Hello all,

Starting the rebuild on my 1971 W30 engine. The car is an automatic car with air conditioning. I need a camshaft since the original is long gone. I am looking for a stock type camshaft that will be close to what came from the factory. I don't want anything wild, just stock. From what I"ve been reading I believe that the A/C auto camshafts were the same as a regular 442. However I have not been able to determine what a stock camshaft would be. I looked at Comp Cams and they have a stock muscle car series (can't remember the name) but don't know if that is something I should entertain or not. Anybody have a recommendation?

Cheers

Richard

 

442.com has all that info

1971 400084 36 250/264 .400/.400 350 2BC, 4BC AT
400117 44 258/272 .435/.435 455 Toro w/2.73 axle, 455 ex 400 or
Perf. Eng.
400165 57 285/287 .472/.472 455 4400 OAI w/AC, 4400 AT
402486 48 262/274 .440/.440 350 4BC ST,455 Toro w/3.07
409691 61 286/287 .474/.472 455 4400 ST, AT OAI ex AC
409717 32 250/264 .400/.400 350 5y400
409759 68 294/296 .472/.472 455 4400 ST OAI (W-30)

 

Here's the specs for the 1971 W-30 cams. Note that the duration is the advertised duration, not at .050". You can use these specs to help you pick a modern cam, but be warned that modern performance cams tend to have faster ramps, more lift, and less duration, so you'll be comparing apples to oranges.

Personally, if you let me choose from these exact three cams today, I wouldn't hesitate to use the W-30 MT cam (409759) even for an AT car with AC. But I'd also use a higher stall converter (say, 2800 - 3000).
--------------------------------

P/N: 400165
Application: W-30 AT w/AC, also non-W30 442 AT.
IVO: 24 BTDC
IVC: 81 ABDC
EVO: 74 BBDC
EVC: 33 ATDC
Intake CL: 118 ATDC
Exhaust CL: 112 BTDC
Lobe Separation: 115
Duration: 285/287
Overlap: 57
Valve Lift: .472/.472

P/N: 409691
Application: W-30 AT exc. AC, also non-W30 442 SM.
IVO: 28 BTDC
IVC: 78 ABDC
EVO: 74 BBDC
EVC: 33 ATDC
Intake CL: 114 ATDC
Exhaust CL: 112 BTDC
Lobe Separation: 113
Duration: 286/287
Overlap: 61
Valve Lift: .474/.472

P/N: 409759
Application: W-30 SM.
IVO: 32 BTDC
IVC: 82 ABDC
EVO: 80 BBDC
EVC: 36 ATDC
Intake CL: 114 ATDC
Exhaust CL: 114 BTDC
Lobe Separation: 114
Duration: 294/296
Overlap: 68
Valve Lift: .472/.472

 

Or you could just do an Erson TQ50. Lift is .504 on both, adv is 296/306 with an @.050 of 228/235. This cam works great with stock rockers and is just a bit faster than the original stuff. Let me know if I can help.

Thanks and best of luck!!!

 

Thanks for the responses guys! Would like to stick as close to stock as possible. I did see a lot of those specs before but didn't know how they translated to modern stuff. That Erson TQ50 looks interesting buy the way. I definitely may consider that.

Cheers,

Richard

 

cutlassefi, the TQ50 is suited to the A/C and TH400 equipped 455 then?
Would it require a higher stall converter?

 

That's a good question, something I also need to know - am going to have cutlassefi make one for me - what I want is a box stock period cam that won't require anything like a higher stall speed, faster ramps, etc with the understanding that there may be some minor improvements from todays cam designs - or not. Personally I would be happy with an original nos cam but this car will be strictly a highway/driver car. Also don't want any noise.

 

If you want that stock cam, give Greg at Supercars Unlimited a call to find out if he still has it:

http://www.supercarsunlimited.com/70...aft-d1116.aspx

 

From my experience i would say that a 228/235-cam would be on the edge for an automatic low compression car…i think stock was around 214/218 on the intake side. If you want to keep it stock including the stock-shiftpoints there is no sense in adding a cam that brings its benefits beyond those shift-rpms….but you would lose lowend-punch and your smooth idle. For a stock rebuild i would not go higher than a 221-intake @0,050...

 

I have had great luck with several W30 cars and the 409759 294/296/472 cam always performed well with stock exhaust and intake and automatic w/AC, I always had enough vacuum for the brakes and the low end response was always great. JMO