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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: Russ H.]
#1387417
02/15/13 01:31 AM
02/15/13 01:31 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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all I can add is they are 2&1/4 outlets & the dr one is somewhat restricted. I'd want better for 408 cubes but as you know headers are much more difficult to deal with
live every 24 hour block of time like it's your last day on earth
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: scatpacktom]
#1387419
02/15/13 01:33 PM
02/15/13 01:33 PM
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Joined: Dec 2004
Posts: 371
Russ H.
OP
enthusiast
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OP
enthusiast
Joined: Dec 2004
Posts: 371
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Quote:
I am 
What cam are you using????????
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: Russ H.]
#1387421
02/15/13 08:07 PM
02/15/13 08:07 PM
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Joined: Oct 2003
Posts: 2,315
South, FL
cudaized
top fuel
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top fuel
Joined: Oct 2003
Posts: 2,315
South, FL
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I have a 416 stroker with factory 1970 340 exhaust manifolds - extrude honed. Cam specs: Cam: Hughes HE3844AL for high torque Lobe separation: 108 Installed centerline: 106 Intake Exhaust ----------------------------- Cam Lift 0.357 0.360 Valve Lift w/1.5:1 0.535 0.540 w/1.6:1 0.571 0.576 Valve Lash Settings .000" .000" Duration Advertised 286 290 @0.50" 237 244 Cam timing @ 0.50" Opens: 13 BTC 53 BBC Closes: 44 ABC 11 ATC 515 ft lbs of torque at 5,300 RPM. I think it runs good. 
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: not_a_charger]
#1387424
02/15/13 08:22 PM
02/15/13 08:22 PM
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Joined: Jan 2003
Posts: 3,103
Phila Pa
scatpacktom
master
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master
Joined: Jan 2003
Posts: 3,103
Phila Pa
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Quote:
Was the Extrude Honing worth the money? I know it ain't cheap.
No its not 
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: ScottSmith_Harms]
#1387427
02/16/13 08:55 PM
02/16/13 08:55 PM
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Joined: Oct 2003
Posts: 2,315
South, FL
cudaized
top fuel
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top fuel
Joined: Oct 2003
Posts: 2,315
South, FL
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Quote:
The problem with my engine is not the exhaust, the cork is the intake at this point, there may well be some more HP available from the manifolds once I open up the intake etc.. Tough to say until the exhaust becomes the biggest restriction.
I went searching for this too. I found a little bit, but don't get your hopes up to high. Your numbers are about right for these "stock" appearing set ups.
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: cudaized]
#1387429
02/17/13 03:00 AM
02/17/13 03:00 AM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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Quote:
Quote:
The problem with my engine is not the exhaust, the cork is the intake at this point, there may well be some more HP available from the manifolds once I open up the intake etc.. Tough to say until the exhaust becomes the biggest restriction.
I went searching for this too. I found a little bit, but don't get your hopes up to high. Your numbers are about right for these "stock" appearing set ups.
right but there are more than a few that look stock running much higher CR, and much bigger solid rollers, with tricked out carbs and intakes, many of those engines are well over 500hp
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: ademon]
#1387430
02/17/13 11:46 AM
02/17/13 11:46 AM
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Joined: Oct 2003
Posts: 2,315
South, FL
cudaized
top fuel
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top fuel
Joined: Oct 2003
Posts: 2,315
South, FL
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Quote:
right but there are more than a few that look stock running much higher CR, and much bigger solid rollers, with tricked out carbs and intakes, many of those engines are well over 500hp
Yes they are. Here is what I ended up with.
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: Russ H.]
#1387431
02/17/13 02:56 PM
02/17/13 02:56 PM
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Joined: Jan 2003
Posts: 3,103
Phila Pa
scatpacktom
master
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master
Joined: Jan 2003
Posts: 3,103
Phila Pa
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Quote:
Are any of you F.A.S.T. or stock appearing guys running hydraulic roller cams in stroked small blocks with the 340 HP Exhaust manifolds? If so, whose cam and specs?
A hydraulic cam has no business being in a race engine.
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: Russ H.]
#1387432
02/17/13 03:00 PM
02/17/13 03:00 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Most shelf type cams are totally wrong for a engine running exhaust manifolds.There are several things to consider with manifolds, and what you " think should work", probably is way off base. They have " special needs", just like most of us. 
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Anyone running a 408 stroker with 340 Exhaust Manifolds
[Re: CompWedgeEngines]
#1387433
02/17/13 03:07 PM
02/17/13 03:07 PM
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Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing
master
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master
Joined: Mar 2007
Posts: 3,300
Northern Indiana
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Quote:
Most shelf type cams are totally wrong for a engine running exhaust manifolds.There are several things to consider with manifolds, and what you " think should work", probably is way off base. They have " special needs", just like most of us.
I agree 100% . Get in touch with somebody that builds and tests several engines and has a good idea of what it takes.
Most cam companies tech lines get it wrong too.
Keith
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