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  #1  
Old Feb 15th, 11, 7:35 PM
WVU454SS WVU454SS is offline
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Dave
 
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Default 496" BBC Build

I'm officially starting my build thread for my next BBC.
This will be an on going thread showing progression from beginning to end results on the engine dyno.

This is going to be a 496" pump gas BBC.
HP goal is ~740-760hp @ 6800-7100 RPM
TQ goal is ~640-660hp @ 4700-4900 RPM

Details:

- 1976 2-bolt main block. Yes, I'm going to test the strength of a studded 2-bolt block with this build.
- Forged 4340 internal balance 4.25" stroke crank
- Forged 4340 H-Beam 6.385" rods w/ ARP 2000 bolts
- Mahle 18cc small dome 4.310" coated pistons
- Rotating assy is balanced to 0.1 gram
- Mahle regular tension ring pack
- Clevite H Bearings on rods/mains
- Block is @ machine shop getting line honed, bored +.060", honed with tq. plates, parallel decked, setting deck height to 9.786" leaving the pistons .006" in the hole, running an .039" gasket gives a ~.045" quench.
- Dart Pro 1 335cc CNC heads. 2.30 Intake valve, 1.88 Exhaust valve. Stock 121cc chambers yields ~9.91:1 SCR
- I was thinking about having the heads milled to 114cc to get a 10.56:1 SCR but I don't see the HP/$ gains worth it. 0.5 point of compression which = ~10 hp not worth $250.
- Dart single plane intake
- Pro-Systems 4150 1000hp carb
- Preliminary billet solid roller cam specs are:
275*/285* @ 0.050"
.720"/.690" Gross Lift
109 LSA installed on a 106 ICL
- Isky Red Zone EZ roll lifters
- 1.8 stud mount Harland Sharp Rocker
- ARP fasteners throughout

A pretty basic deal really.

Pics:
















Rods (chinese junk)





Mahle's Powerpak Coated Pistons






......
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  #2  
Old Feb 15th, 11, 7:36 PM
WVU454SS WVU454SS is offline
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Dave
 
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Default Re: 496" BBC Build

Pro-Systems Carb




Block being cleaned and deburred prior to machining






Starting on the lifter valley




Also deburring the outside so it will look pretty with some black paint on it






Outside almost finished










Stay tuned for more!

Dave
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  #3  
Old Feb 15th, 11, 7:45 PM
VORTECPRO VORTECPRO is offline
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MARK
 
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Default Re: 496" BBC Build

Quote:
Originally Posted by WVU454SS View Post
I'm officially starting my build thread for my next BBC.
This will be an on going thread showing progression from beginning to end results on the engine dyno.

This is going to be a 496" pump gas BBC.
HP goal is ~740-760hp @ 6800-7100 RPM
TQ goal is ~640-660hp @ 4700-4900 RPM

Details:

- 1976 2-bolt main block. Yes, I'm going to test the strength of a studded 2-bolt block with this build.
- Forged 4340 internal balance 4.25" stroke crank
- Forged 4340 H-Beam 6.385" rods w/ ARP 2000 bolts
- Mahle 18cc small dome 4.310" coated pistons
- Rotating assy is balanced to 0.1 gram
- Mahle regular tension ring pack
- Clevite H Bearings on rods/mains
- Block is @ machine shop getting line honed, bored +.060", honed with tq. plates, parallel decked, setting deck height to 9.786" leaving the pistons .006" in the hole, running an .039" gasket gives a ~.045" quench.
- Dart Pro 1 335cc CNC heads. 2.30 Intake valve, 1.88 Exhaust valve. Stock 121cc chambers yields ~9.91:1 SCR
- I was thinking about having the heads milled to 114cc to get a 10.56:1 SCR but I don't see the HP/$ gains worth it. 0.5 point of compression which = ~10 hp not worth $250.
- Dart single plane intake
- Pro-Systems 4150 1000hp carb
- Preliminary billet solid roller cam specs are:
275*/285* @ 0.050"
.720"/.690" Gross Lift
109 LSA installed on a 106 ICL
- Isky Red Zone EZ roll lifters
- 1.8 stud mount Harland Sharp Rocker
- ARP fasteners throughout

A pretty basic deal really.

Pics:
















Rods (chinese junk)





Mahle's Powerpak Coated Pistons






......
Well you didnt ask for opinions, but I cant resist. You dont have enogh compression to make that cam work, spend the money and cut the heads. You would be wise to check the stroke on the crank, and rod lengths, and recalculate your deck clearence. Dont forget to knotch the deck of the block.
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  #4  
Old Feb 15th, 11, 7:54 PM
WVU454SS WVU454SS is offline
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Dave
 
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Default Re: 496" BBC Build

Woops! I meant to add thoughts, opinions at the end of the post.


Thank you for the advice. I guess I will reconsider having the heads milled.

Thoughts on recalculating my deck height? Am I not going about this correctly? How can I go about accurately measuring rod length and stroke?

I'm assuming you mean notching the block for intake valve clearance? Can you elaborate on this a little more?

I'm no engine builder but plan on building this one, and would like to do it as "correctly" as possible. Hence the reason I posted this, for people like you to respond with suggestions.

Thank you,

Dave
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  #5  
Old Feb 15th, 11, 8:26 PM
VORTECPRO VORTECPRO is offline
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Default Re: 496" BBC Build

Quote:
Originally Posted by WVU454SS View Post
Woops! I meant to add thoughts, opinions at the end of the post.


Thank you for the advice. I guess I will reconsider having the heads milled.

Thoughts on recalculating my deck height? Am I not going about this correctly? How can I go about accurately measuring rod length and stroke?

I'm assuming you mean notching the block for intake valve clearance? Can you elaborate on this a little more?

I'm no engine builder but plan on building this one, and would like to do it as "correctly" as possible. Hence the reason I posted this, for people like you to respond with suggestions.

Thank you,

Dave
The intake valve notch is correct. On these cranks the stroke varies quite a bit, as with the rod length. These are the tools I use to check this.
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  #6  
Old Feb 15th, 11, 8:30 PM
WVU454SS WVU454SS is offline
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Default Re: 496" BBC Build

Ok. Thank you.

So I should have everything measured and then set my deck height to where I want based off of the longest stroke/rod combo?

How much does a machine shop typically get for measuring these pieces?

Thanks,

Dave
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  #7  
Old Feb 15th, 11, 8:46 PM
VORTECPRO VORTECPRO is offline
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MARK
 
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Default Re: 496" BBC Build

Quote:
Originally Posted by WVU454SS View Post
Ok. Thank you.

So I should have everything measured and then set my deck height to where I want based off of the longest stroke/rod combo?

How much does a machine shop typically get for measuring these pieces?

Thanks,

Dave
I cant tell you what they charge. But mix and match rods to the crank throughs to help even them out, theres an "engine building secret"
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  #8  
Old Feb 15th, 11, 8:46 PM
Joe G Joe G is offline
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Default Re: 496" BBC Build

I think it would be money well spent to box that up and send over to Mark. This way it'll be done correctly and live. But that's just my opinion.
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  #9  
Old Feb 15th, 11, 8:49 PM
WVU454SS WVU454SS is offline
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Default Re: 496" BBC Build

Quote:
Originally Posted by VORTECPRO View Post
I cant tell you what they charge. But mix and match rods to the crank throughs to help even them out, theres an "engine building secret"
Thank you sir!
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  #10  
Old Feb 15th, 11, 8:52 PM
Rokker Rokker is offline
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Default Re: 496" BBC Build

I`m following this one !
subscribe - check
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  #11  
Old Feb 15th, 11, 8:59 PM
BillsCamino BillsCamino is offline
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Default Re: 496" BBC Build

Quote:
275*/285* @ 0.050"
That cam is HUGE...bigger than any cam I ever ran in my 540 with over a point more compression.
And IMO, those heads are too big for those inches...unless you're planning on turning this to 8K.
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  #12  
Old Feb 15th, 11, 9:08 PM
o6r1man o6r1man is offline
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Default Re: 496" BBC Build

I have out of the box dart 325s on my 10:2 TO 1 496 and it loves rpm....If I short shift it kills the ET
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  #13  
Old Feb 15th, 11, 9:26 PM
WVU454SS WVU454SS is offline
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Default Re: 496" BBC Build

Quote:
Originally Posted by BillsCamino View Post
That cam is HUGE...bigger than any cam I ever ran in my 540 with over a point more compression.
And IMO, those heads are too big for those inches...unless you're planning on turning this to 8K.
These are just preliminary cam specs.

I understand the heads probably aren't optimal for the CID and RPM range I'm planning, but this is a budget build and those are the heads I have to work with.

If I could've started from scratch and bought everything new I would use some different parts, but this is what I have and I what I need to work with.

Just trying to get it done on a college kid's budget.

Dave
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  #14  
Old Feb 15th, 11, 9:27 PM
WVU454SS WVU454SS is offline
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Dave
 
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Default Re: 496" BBC Build

Quote:
Originally Posted by o6r1man View Post
I have out of the box dart 325s on my 10:2 TO 1 496 and it loves rpm....If I short shift it kills the ET
How much cam are you running? Where does it make peak power?
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  #15  
Old Feb 15th, 11, 9:27 PM
Ron454 Ron454 is offline
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Default Re: 496" BBC Build

Nobody here has a 496 that runs worth crap.

I'm in for the follow along, my engine guy still teases that now that mine has gone 5 years, we ought to tweak it a bit. It made 700.

Interesting Dart intake, is that something new? World makes something similar. Since it has a 4500 flange, why not use a real dominator on it?
I used a Brodix HV2001 and a Quick Fuel 1050 custom dominator.

My setup runs pretty good in a 3600 lb. Nova, on pump gas.

Ron
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