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Old 08-20-2007, 06:02 PM
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pontiac 400 cam selection

i am trying to find a cam for my stock 400 is a crane 260 h suitable for a daily driver , or step up to a 268 h .. i will be replacing the heads also for a set from 67 ... thanks

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Old 08-20-2007, 07:43 PM
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Crane cams "blueprinted" copy of the old factory Pontiac 400 HO RAM-AIR "S" cam will work very well Crane number 9779068
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Old 08-20-2007, 07:51 PM
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Quote:
Originally Posted by F-BIRD'88
Crane cams "blueprinted" copy of the old factory Pontiac 400 HO RAM-AIR "S" cam will work very well Crane number 9779068
do you think this cam will work with the 67 #143 heads -10.5 comp .would it run on pump gas our would comp be to high
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Old 08-20-2007, 08:28 PM
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Quote:
Originally Posted by eddiekanjr
do you think this cam will work with the 67 #143 heads -10.5 comp .would it run on pump gas our would comp be to high
What do you call "pump gas" 91 is not the same as 93 or 94.

Of the cams of this "size" this cam is the best choice. Not familiar with "#143" heads or that up on pontiac motors as a whole so can't tell ya if you'll actually end up with 10.5:1. If you do end up with an actual 10.5:1 cr you will definatly be "on the edge."

You'll need to accuratly measure the chamber size of the heads, and piston deck clearance to accuratly calculate the cr using those heads on that motor.

http://www.snowperformance.net/
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Old 08-21-2007, 08:59 AM
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ok thanks alot . i think they are 68 0r 72 cc . these are the 325,333 hp heads made before the famous 670 . they are also closed chambered . but i will do the math
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Old 08-23-2010, 05:45 AM
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Quote:
Originally Posted by eddiekanjr
i am trying to find a cam for my stock 400 is a crane 260 h suitable for a daily driver , or step up to a 268 h .. i will be replacing the heads also for a set from 67 ... thanks

old thread worth reviving- the best cams for a street Pontiac are the factory 068, or the Comp Cams 268
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Old 08-23-2010, 06:53 AM
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One thing you will find w/an original 068 cam is the wide 114 LSA. A decent cam is the Summit K2801. It has 214/224 duration, .442"/.465" lift, 112 LSA and is sort of a higher lift version of the 068 Pontiac cam.

FWIW, his '67 "143" heads were dropped mid-'67 for the "061". The 143's didn't have guide plates, both had 2.11"x 1.77" valves.

From HERE:

PONTIAC 068
intake open 31
intake close 77
exhaust open 90
exhaust close 32
overlap 63
lift .408 w/1.5:1 rocker ratio
duration adv 288/302
duration @.050 212/225
LSA 116 ICL 113
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Old 08-23-2010, 09:32 AM
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Quote:
Originally Posted by cobalt327
One thing you will find w/an original 068 cam is the wide 114 LSA. A decent cam is the Summit K2801. It has 214/224 duration, .442"/.465" lift, 112 LSA and is sort of a higher lift version of the 068 Pontiac cam.

FWIW, his '67 "143" heads were dropped mid-'67 for the "061". The 143's didn't have guide plates, both had 2.11"x 1.77" valves.

PONTIAC 068
intake open 31
intake close 77
exhaust open 90
exhaust close 32
overlap 63
lift .408 w/1.5:1 rocker ratio
duration adv 288/302
duration @.050 212/225
LSA 116 ICL 113

Yes I realize that, I've run the 066, 067, 068, 041 RA IV, along with the Comp 268, and Summit 2800, 2801, 2802, in 350, 389, 400, 455 engines. Have also built 428 engine but not with stock cams.

Have run 2801 on a 455 with 1.65 rockers, lots of torque, but runs out of breath and rpm at 5200 with stock D-port heads.

The Summit cams- 2800 is way too small and runs out of breath at a very low rpm, 2801 will rip your head off to 5200 rpm in a 455 but then shuts off like a rev limiter, 2802 has lopey idle and less torque midrange, and with stock heads won't rev over 5200 rpm anyway on a 455, because the stock heads become a restriction

having run both 068, 2801, and Comp 268, I'd have to say the Comp 268 is the best, if I had a choice- I'd take that over a Summit 2801

if I had to choose between the 068 and 2801, I'd take the 068, the wider LSA actually helps it rev a little higher with that small cam lobe, and give better mileage in a street car

it's hard to beat a stock Pontiac cam, because McKellar was such a good cam designer, the newer cams really can't improve much on what he did

race cams are another story, the newer stuff whips the old stuff

I had a pair of "061" heads, sold them on Ebay, they had unique chambers. I've also run 455HO #191 round port heads, casting #12, #13 heads w/041 cams, on 350, 400, 455 engines.

check your sources, because the casting "143" heads are listed as having 1.92/1.66 valves, not 2.11/1.77 size
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