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Old 11-28-2010, 05:09 PM
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Your estimate on horsepower.

427 BBC .030 over
TRW forged 2268 closed chamber pistons .030 over Goal (10.0 compression)
049 heads open chamber 2.19 int an 1.88 exh. gasket matched Ported
Link to camshaft http://www.summitracing.com/parts/CCA-CL11-772-8/
Holley 850 DP
Edelbrock 2904 intake Victor JR 3500-7500
Balanced rotating parts.

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Old 11-28-2010, 05:55 PM
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570 HP, 549 FT lbs with that exact cam and intake and the 850, figuring full large tube headers and open or free flowing mufflers.

If you can get me rough flow specs on the heads I can give you a better

I have Edelbrock numbers and when I put in the performer Aluminum head flow numbers I get

580, 561

Edelbrock victor JR
605, 567

Hope that helps
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Old 11-28-2010, 05:57 PM
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My thoughts are about 550hp, the compression ratio is a little low for that cam.
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Old 11-28-2010, 06:07 PM
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Quote:
Originally Posted by ericnova72
My thoughts are about 550hp, the compression ratio is a little low for that cam.
I was thinking that too. May try to get it around 10.2 or 10.3. Those are the pistons I have to work with or spend about $650 est. for another set. Just to get 10.5.

Any thoughts?
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Old 11-28-2010, 06:17 PM
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Quote:
Originally Posted by Bowtie man
I was thinking that too. May try to get it around 10.2 or 10.3. Those are the pistons I have to work with or spend about $650 est. for another set. Just to get 10.5.

Any thoughts?
If you can't easily get it to 10.8-1+ without spending a bunch then I wouldn't even worry about it, live with what it is. It will still run hard enough to scare most people. Just going to from 10.0 to 10.2-10.3 isn't going to do enough to bother with IMO if it is already together.

If it isn't together yet then mill the heads or deck the block to get 3/4+ of a point, get what you can easily.
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Old 11-28-2010, 06:33 PM
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Quote:
Originally Posted by ericnova72
If you can't easily get it to 10.8-1+ without spending a bunch then I wouldn't even worry about it, live with what it is. It will still run hard enough to scare most people. Just going to from 10.0 to 10.2-10.3 isn't going to do enough to bother with IMO if it is already together.

If it isn't together yet then mill the heads or deck the block to get 3/4+ of a point, get what you can easily.
It is not together yet. But, I have the pistons, block an heads now. What would be a safe ratio for pump fuel? I know it plays in line with the cam too.
I am not dead set on that cam.

Here is the other cam I was thinking about. I just want a little more upper end.
http://www.summitracing.com/parts/CCA-CL11-692-8/
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Old 11-28-2010, 09:21 PM
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With pump gas I would leave it at 10-1, no sense pushing what you can get away with, and I'd stay with your initial cam choice, a 427 is going to want to rev to make power.

For pump gas you have a good thought out combo from the beginning
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Old 12-01-2010, 05:04 PM
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427 BBC .030 over
TRW forged 2268 closed chamber pistons .030 over Goal (10.3-10.6 compression)
049 heads open chamber 2.19 int an 1.88 exh. gasket matched Ported
Link to camshaft http://www.summitracing.com/parts/CCA-CL11-772-8/
Holley 850 DP
Edelbrock 2904 intake Victor JR 3500-7500
Balanced rotating parts.


I have since learned that the compression is going to be 10.3-10.6. This is going in a pickup, who would of thought. Ok, the truck weighs 4120 with me in it an a full tank of fuel. I think I can get it down to about 3700 with me in it. Lighter would be better. Looking for your thoughts or suggestions. I have plans for a built 350 turbo an a 10" TCI converter. Posi in the rear an gears are a ? Thinking 4.11's but do like 4.56's. This a weekend driver never much farther than a trip 25 miles one way. If farther, I will just trailer it.

What gears in your opinions?
Anything else, feel free to discuss.
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Old 12-01-2010, 05:17 PM
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4.56's, especially if the tire size is 28" OD or bigger. Make sure whoever does your TH350 knows what they are doing, it will need an aftermarket Direct drum with the 36 element "dog bone" sprag in place of the stock weak roller sprag and drum. A heavy duty sun shell and a 700R4 low roller support would be smart too.
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Old 12-03-2010, 05:23 PM
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Quote:
Originally Posted by ericnova72
4.56's, especially if the tire size is 28" OD or bigger. Make sure whoever does your TH350 knows what they are doing, it will need an aftermarket Direct drum with the 36 element "dog bone" sprag in place of the stock weak roller sprag and drum. A heavy duty sun shell and a 700R4 low roller support would be smart too.

I am going with one of the best in the state as for as I know on the transmission. I lot of racers all over the state use him. We have discussed everything you spoke of above.

One other question that comes to mind. How do you think the frame is going to respond to that much torque being put on the ground? If I use 4.56 an 28"x 11.50 tires? I have plans of some racing shocks an springs for the back.
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Old 12-03-2010, 06:36 PM
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Frame should have no problem dealing with it.

What rear axle is in it, 8.5" Corporate 10 bolt or a 12-bolt??
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Old 12-03-2010, 06:49 PM
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Quote:
Originally Posted by ericnova72
Frame should have no problem dealing with it.

What rear axle is in it, 8.5" Corporate 10 bolt or a 12-bolt??

4.10's 12 bolt. Going to put or thinking about Eaton posi unit with 4.56.
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Old 12-03-2010, 07:52 PM
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As long as the 4.10's are already there, give them a try-out, it will give you an indication on how far you want to go if you find you need more gear and plan to change them.

C-clip eliminators will be needed if you plan any track time. A girdle cover would also be a smart move, especially at that much weight.
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Old 03-11-2011, 06:30 PM
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427 BBC .030 over
TRW forged 2239's closed chamber pistons .030 over Goal (10.3-10.6 compression)
049 heads open chamber 2.19 int an 1.88 exh. gasket matched Ported an flowed.
Link to camshaft http://www.summitracing.com/parts/CCA-CL11-772-8/
Holley 850 DP
Edelbrock 2904 intake Victor JR 3500-7500
Balanced rotating parts.


I thinking about splayed caps making it a four bolt main splayed block. What are the thoughts on here? I know it is better safe than sorry. But, do you think it would be a must?
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Old 03-11-2011, 09:02 PM
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The BBC 2-bolt cap is a much bigger cap than a SBC 2-bolt cap. With the BBC cap walk at higher rpm isn't a common problem like it is with a SBC.

I'd say that unless you choose to head over 7500 rpm on a regular basis I wouldn't see the need for 4-bolt straight or 4-bolt splayed caps.

Does anyone even make splayed caps for a BBC?? I had thought all BBC 4- bolt caps, stock or aftermarket, are straight??
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