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79 K5 H-Bomb build

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Just got off the phone with Comp Cam... They suggested using the xm270hr cam. It's a marine cam but he said dont get tied up by the "names" they give them... they are just what they are typically used in.

https://www.summitracing.com/parts/cca-k01-445-8/overview/

seems close to the same cam I had previously picked but with an LSA of 112 which they said would give me a very good chance of passing DEQ with it.

desktop dyno puts that one at 562hp @ 5000 and 611tq @ 4000 and still pump gas friendly (and running a cat). Seems like a decent choice.
 
While I am in a holding pattern for the motor I actually decided to get out the shop and do something that I've been putting off for while...

the first cut hurts the most...

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I'm trying set up the shocks so I pulled out all the leafs except the main so I can move the springs to full compression to determine shock mount placement:

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This is what I would consider full stuff... any further and the springs start to invert. It's also getting close to the pan and crossmember. I do have a ORD "high clearance" crossmember to use when I put the BB in there. I'm hoping that the bigger oil pan doesn't interfere.

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For a nice BBC cam, I wouldn't go under .540 lift. I run the 11-239-3 cam in my 468 and it has get up and go w/ great bottom end. Gets my K5 going in a hurry....
 
beags86 said:
I am going to run the lunati 201107112 cam in my 496.
http://www.lunatipower.com/Product.aspx?id=2156&gid=289

Not sure if your going roller or not.
But I am looking for 600hp/600tq
Click to expand...

Roller cams produce more power and torque than a flat tappet but you also need the heads and intake to flow to get into the 600 area.... That's not a bad cam @ all but won't rev much more than stated. I spin my .544/.564 lift flat tappet cam to 6K but it doesn't like much more than that but you have more lift but same rpm range...
 
Well me personally, I'll have enough head and intake for that cam. I can't say what the H BOMB is going to have.

And if I am spinning my 496 at 6 thou my rear tires would have turned into rubber soup by then. As my 496 is Destined for my 2wd....
 
I'm not looking for rpm past 5500-6000 for this application. That cam puts the curve where I want it for the most part. The lsa of the cam that I picked will give it a good chance of passing emissions and have a nice idle. Sure I would love to have the "rowdy sound" of a cam with lots of overlap but that could cause a problem when I need to grunt through a off camber hill climb. Control/low-mid power is more important in this application than sound and peak horsepower.
 
brokenparts said:
I'm not looking for rpm past 5500-6000 for this application. That cam puts the curve where I want it for the most part. The lsa of the cam that I picked will give it a good chance of passing emissions and have a nice idle. Sure I would love to have the "rowdy sound" of a cam with lots of overlap but that could cause a problem when I need to grunt through a off camber hill climb. Control/low-mid power is more important in this application than sound and peak horsepower.
Click to expand...

People pick cams based on sound?:pimp:
 
Hoss7979 said:
You would be amazed what people want now a days.....as long as it's sounds mean I want it! Even though it only revs to 2500rpm.....hahaha
Click to expand...
Quit picking on my stock sBC with a flowmaster 40 series...
 
brokenparts said:
I'm not looking for rpm past 5500-6000 for this application. That cam puts the curve where I want it for the most part. The lsa of the cam that I picked will give it a good chance of passing emissions and have a nice idle. Sure I would love to have the "rowdy sound" of a cam with lots of overlap but that could cause a problem when I need to grunt through a off camber hill climb. Control/low-mid power is more important in this application than sound and peak horsepower.
Click to expand...

:angry1: Damn emissions the true killers of engines!!! :angry1:
I hear ya that's why I went w/ the 11-239-3, at the time all my friends had trail rigs and that's what I was building my 468 for. Well by the time I'd gotten all the parts rounded up and engine installed they had sold all there stuff. So I was kinda stuck in limbo, great trail engine but not so much on the mud bog seen! But this winter in installing a bigger turbo/blower cam to help w/ my new nitrous setup.

I might have missed it but what heads, intake, and fuel delivery are you gonna be running?
 
Hoss7979 said:
:angry1: Damn emissions the true killers of engines!!! :angry1:
I hear ya that's why I went w/ the 11-239-3, at the time all my friends had trail rigs and that's what I was building my 468 for. Well by the time I'd gotten all the parts rounded up and engine installed they had sold all there stuff. So I was kinda stuck in limbo, great trail engine but not so much on the mud bog seen! But this winter in installing a bigger turbo/blower cam to help w/ my new nitrous setup.

I might have missed it but what heads, intake, and fuel delivery are you gonna be running?
Click to expand...

Heads- worked over 049s, pocket ported, 2.19/1.88 valves
Intake- eldebrock dual plane performer rpm
Fuel- either Holley sniper or fitech fuel injection
Cam-xm270hr roller cam/ comp full roller rockers
Block- zero decked/punched .070 over forged pistons/I beam rods/ cast steel stroker crank (eagle) -makes it a 498.ci.
 
brokenparts said:
Heads- worked over 049s, pocket ported, 2.19/1.88 valves
Intake- eldebrock dual plane performer rpm
Fuel- either Holley sniper or fitech fuel injection
Cam-xm270hr roller cam/ comp full roller rockers
Block- zero decked/punched .070 over forged pistons/I beam rods/ cast steel stroker crank (eagle) -makes it a 498.ci.
Click to expand...

Not a bad little setup, you looking @ 9.5:1 or so?
 
82355 said:
Why not go 0.100" over and top the 500 cubic inch mark?

Martin
Click to expand...

No particular reason against or for... just didnt bother. :dunno:

Did some more work trimming at full bump and getting the shock mounts tacked in:

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I see why the lower panel develops rust:

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Obviously, I need to trim down those Ford tower mounts but I'm inching along. Having a th400 built next week and need to tear apart my doubler again to swap out the input. After I get trans and x-fer case mounted I can measure for drivelines.
Next on the list is thinking about a master cylinder or maybe hydrobosst brakes, floor mount shifter, and kickdown cable.
 
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