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Old 12-08-2006, 12:10 PM
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Sbc Help

I have a 1972 C10 with a 327 (HEI Ignition) in it and I have came across a set of 461 Double Humps for $150 and I am gonna buy them and have new valves and springs..etc. I have got a Xtreme Energy 284 cam (.507/.510 lift), lifters, and Comp pushrods. The truck has a 750 Holley Carb on it....and backing this is a TH350 all heavy duty internals...shift kit...etc...and 12 bolt rear end with a 3.73 gear.....but I can't figure out which stall I need I am on a very very tight budget and have found 2 torque converters both from JEGS and are Jegs brand one is 2000-2300 ($99.99) and the other is a 2300-2700 (129.99)the cam recommends a 2800-3000 which in my opinion is to big for a street car/truck. The guy that rebuilds our carbs and tunes them says he can make it run great with either one of those stalls, but which one would be best would the smaller one be enough or would the larger rev my engine to much for street use and damage it?
Thanks
PS approx how much horsepower would this combo have I was guessing 300-375 HP

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Old 12-08-2006, 12:30 PM
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I would run the larger of the two converters, cam needs it. What is your CR? I Would guess that HP will be in the 330-360 range depending on your conpression. The 461 are gonna hurt power a litte but should be fine.
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Old 12-08-2006, 12:39 PM
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If the heads need guides you`d likely come out even by buying a new set of aftermarket heads. You`d be ahead power wise and have a new set of heads on top of that. I would go with a smaller cam since it`s a 327, this way, you could use a smaller converter and it would be more street friendly to a heavy truck.
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Old 12-08-2006, 02:02 PM
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Well I got the cam for free and its new...CR is around 10:1
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Old 12-08-2006, 02:03 PM
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How will the 461 hurt the power it would raise my compression considering the heads it has on it now are 76cc and the 461's are like 62.5 or 63cc?
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Old 12-08-2006, 05:01 PM
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You didnt say what the truck will be used for but assuming its your daily driver then I would not recommend that big of a cam, free doesnt meen squat if it wont work in your engine nor would I use a 750 cfm Holley for a 327. If you want a lot of rump-rump that would still be fairly streetable then the Comp XE-268-H, 224/230 dur. 477/480 lift or its equivalent would be a better deal. I'd stay with a 650 or even 600 Holley and you wouldnt have to run that much converter. The 461 heads are 62cc. and will work if all you need is valves and springs. Most of us understand budgets but If they are totally shot then junk them and get some Vortechs. Only a couple hundred more than doing a complete redo on the 461's and the Vortechs and the above cam will really make that little 327 scream.
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Old 12-08-2006, 05:48 PM
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How much better would those Vortecs work compared to the Double Humps?
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Old 12-08-2006, 06:51 PM
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Like night and day, probably give you 30 hp over the 461's, ....and they're new!, you dont have to worry about the machine work. Even if they were brand new the couldnt come close to the Vortechs, thats how good they are, guys on this forum swear by them.
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Old 12-08-2006, 07:08 PM
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How much can I get a set for to accommodate for that cam?
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Old 12-08-2006, 07:09 PM
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The new Vortechs go for around $500, you will also need an intake manifold to go with them . Edelbrock makes a good Performer that will work.

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Old 12-08-2006, 11:33 PM
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If you go vortec, you`ll need a intake and self aligning rockers, if you buy GM vortecs the guides will need clearenced, so that is more money on already tight budget. I would look into world`s heads or RHS heads that have a set that are ready to bolt on and you can use your existing intake. You would still be power ahead over the 461`s. The 461`s are good heads but somewhat old technology. The 268 cam would work fine and still give it a good idle. RHS took over the pro topline company, and they have some good heads at good prices. If the 461`s don`t need guides then I would use them, but If they need guides I`d sell them.
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Old 12-08-2006, 11:38 PM
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I agree with the vortecs.Much more effecient.I had a
350 9.25:1
461 camel bump heads 2.02/1.60
256H comp cam
Gear drive
Performer rpm intake
600 cfm edelbrock carb
1.52 roller rockers
Stock TH400 with 2000 stall
It ran really good.For a while,It got around 16mpg on the highway.It would've done a lot better if I did'nt have such steep gears.I had 4.10's in the back.So on the freeway it was keeping at 3600-3800rpm a little loud.But I changed to 3.42 gears in the back and it dropped the rpm by 1000.And I was getting 18mpg.The only reason I pulled it was because I started to get chocolate milk oil in it.I ended up upgrading to a
383ci 9.67:1
Vortec heads L31 1.94/1.50
1.52 roller rockers
268XE cam
Gear drive
Performer intake
600cfm edelbrock carb 1406
TH700-R4,2400 stall
And swapping to 3.73 gear with a powertrax diff.
im still assembling the motor.I have'nt decided for sure on the cam So I just have the short block assembled.
But a 284XE cam.Would sound nice,but not be practical if you drove the truck everyday.I probably would'nt go any bigger than the 268XE cam.
Being a 327 the cam will seem bigger in it than it would in a 350.More rough idle.I built a 67' C10 that sounded just like youre's
327ci 9.6:1
Camel bump heads 2.02/1.60
1.52 comp roller rockers
Pete Jackson gear drive
265H dual energy comp cam
Performer rpm intake
600 cfm edelbrock(Rebuilt)
HEI 50K
TH700-R4 with breakaway stall(2400)
3.73 gears
It had a mild lopey sound at idle.But it came on real strong in the mid range.Around 1500 and pulled real hard to 6000rpm.
It was a great truck I did a complete frame off restoration.A friend of my fathers sold me it as his work truck,for $500.00.I loved the look on the guys face when I brought it back to show it off after I completely restored it.I was only 18 when I built it.And it was the second truck I built.I sold it for $20,500 on ebay.I was suprised it went that high.But I probably being I only put $10,000 in it.
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