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Old 07-04-2012, 12:30 PM
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68 Camaro Convertible, 327 RS
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Okay folks.

I'll pic up a set of 3.73 gears from Summit and start there.


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  #17 (permalink)  
Old 07-04-2012, 03:15 PM
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68 Camaro Convertible, 327 RS
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F-Bird, one more question.

Where do you get the numbers for the cam intake closing? I'm looking through the CAM shaft descriptions for comparison and can't find that number.

Is this something you calculate from the other specs?

(BTW, my tires size is 255-60-15 ..should be a 27" overall height..or close to it)

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Old 07-04-2012, 03:54 PM
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You can calculate it but a lot of cam manufacturers provide it. I wouldn't get cheap on the cam, cheap cams have 40 year old lobe profiles and they've improved a lot since then.
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Old 07-04-2012, 08:26 PM
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Originally Posted by F-BIRD'88 View Post
If you are going to run a 27" tire get 4.30's.
The tire diameter has an effect on the overall effective gearing.

No wonder it's a snail.

Your present cam timing open close numbers are -3 47 intake and 45 -1 ex
These are @.050" lifter rise
224-224 115-113 centers 114lsa .450-.461
Should be on the cam card.

that cam was designed for 11:1 +++ cr.
It is dead with anything less than about 10.3:1 compression.
Advancing it by 8deg (39deg intake) closing point will help low end power)
107 in 121 ex centers
This will help some but this cam does not like a stock converter, low compression or stock gears at all.

That cam needs a 3000++ stall converter (9.5" lockup (245MM) with funtional lock up
Precision Industries
Yank Performance

Your 291 casting heads just need porting (felpro 1205 gasket size.)
The compression ratio needs to be corrected to 10.3:1 10.5:1
may just need a .015" shim style head gasket and a head deck clean up.
Get a perfomer rpm manifold and 750cfm holley.
Isky 270 Mega cam #201271 with 1.6 rockers
270-270 221-221 @.050" .495" .495" valve lift with 1.6 rockers. 108LSA 104In c/L
same idle much more power.

much better cam,,, do all this and be prepared for 12sec ET performance.

4.30 gears 27" ties overdrive

Easy hiway cruise at 2350 rpm 100KLMS (62MPH) 2990 rpm @80 MPH (130KPH)

You can cruise to your hearts content. Be prepared to get nailed to the seat when you rug it.
Don't let your face crack from the perma grin.
This is how a 327 Camaro was intended to go.
Ive used the cam FBird suggested more times than I can remember in 327s-and 350s
The combo he is giving you is right on for what you wanna do
Cam should be pretty close to 450 460 or so lift n 220 to 230 duration @0.50
Thats about what he recommended
Listen to this guy.....Knows his chit......I been readin his posts
By the way I use 1.6 rockers with this cam,when that wasnt available I used BB rockers n bumped the covers for clearance........But that was Soooooo long ago
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Old 07-05-2012, 02:56 PM
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with the AFR heads the car is going to pick up regardless if you change the cam or not. I MYSELF wouldnt waste money on "generic" cam grinds they maybe low cost but Ive seen cam specs way off what they should be from "generic" cam grinds... I trust Comp cams, but id trust Isky more than even comp Cams, I do however like the XE comp cams line, and with the AFR heads the XE 274 although a bit larger in duration with the added lift will make ALOT of difference with what you have...

If you insist on keeping the intake you have do yourself a favor and at least port it... The weiand Stealth intake Flow's decent, but the professonal products single plane, (second time ive recomended that intake today) will work well and not cost you much bottom end with its "ram" effect.. So I recomend..

The Afr heads
CC XE 274 cam
Pro products single plane intake.
if money permits add an x-pipe and aero chamber mufflers
STICKY tires as well cuzz if i drove it with that combo Id be sideways in 3rd gear
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