Re: 500 stroker build
[Re: Canam800]
#2516870
07/03/18 01:53 PM
07/03/18 01:53 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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The cam I bought was ordered by Benschoff (SP?) racing from Comp Cams, it was a solid roller that had 260@.050 on the intake with .420 lobe lift. 266 @.050 with .409 exhaust lobe lift ground on a 108 lobe separation angle installed from 106 to 107 intake lobe center. It had a set of Harland Sharp 1.65 roller rockers also on the second and third set of heads. The first time I dyno tested the motor on a DTS engine dyno in Ontario, CA at the Carb Shop dyno it made 612 HP at 5500 RPM and 644 Ft. Lbs. at 4500 RPM with a low deck 6 pack and set of iron 906 heads that made 9.25 to 1 compression ratio, I liked those results a lot That was a 1976 400 block with four sleeves in it bored to 4.375 with a 4.250 stroke crankshaft and a set of CAT 6.800 long BB Chevy H beam rods, Ross -22.0 CC dished pistons installed .025 down from the deck with Fel Pro 8519 PT head gaskets, nothing magic about any of those parts The next time I dyno tested it was with a set CNC ported Eddy RPM heads and a new 4.300 stroke crankshaft to raise the compression ratio up to 10.29 to 1, same cam, rods, pistons and so on Those tests where done in the middle of winter here in central OR at 2500 Ft altitude on a Stucka dyno that was not calibrated correctly That dyno said it made over 700 HP with the six pack(720 HP at 5600 RPM) and a Team G dominator intake(710 HP at 5800 RPM) with a 1050 Dominator carb with a Wilson intake Manifold 1.5 inch reversion spacer The last time I dyno tested it was with the same short block and a set of Indy SR M.W. intake port heads with the same rocker arms as the Eddy RPM heads, those heads had 76.00 CC combustion chambers that raised the compression ratio up to 10.78 to 1 with the Fel Pro 8519 PT head gaskets and they flowed 30 CFM more than the RPM heads did on the same flow bench. I used a Indy 400-3 intake with the Wilson 4500 reversion spacer and a Holley #9375 Dominator carb with the stock jetting. It was dyno on a another DTS engine dyno in Klamath Falls, OR at 4300 Ft elevation and it made 727 HP at 7000 RPM and a little less torque than HP on Oregon 91 octane non ethanol pump swill On your deal go big on the heads and camshaft and rocker arm ratio, it will pay off big with a lot of tire smoke and almost out of control power
Last edited by Cab_Burge; 07/03/18 01:55 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 500 stroker build
[Re: Canam800]
#2517081
07/03/18 04:33 PM
07/03/18 04:33 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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the compression ends up a little higher as long as I put enough cam in it to run on pump gas
The cam isn't an adjustment for static CR.
Boffin Emeritus
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Re: 500 stroker build
[Re: Canam800]
#2517089
07/03/18 05:12 PM
07/03/18 05:12 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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As long as the OP doesn’t have any qualms about running a higher octane fuel if required, the motor should run great with 11.5cr.
If real pump gas compatibility was the goal, Then I’d be looking to have the motor be around 10.5cr, which is really going to require a piston change.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 500 stroker build
[Re: Canam800]
#2517099
07/03/18 05:45 PM
07/03/18 05:45 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I had flattop pistons at first for my 440/493 as I was going to use 84cc RPM heads but when I decided to go with the 75cc EZ heads I switched to the D-dish type of piston. It still has a flat portion to get good quench but dropped my comp from about 11.8 to 10.6 which is what I was shooting for in my pump gas build. I was lucky as I traded my flattop pistons to my brother for some Hughes roller tip rockers and then bought new pistons. Good luck with your build. Ron
Last edited by 383man; 07/03/18 05:45 PM.
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Re: 500 stroker build
[Re: Canam800]
#2517352
07/04/18 10:54 AM
07/04/18 10:54 AM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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For intakes to fit your criteria, the two choices are the Indy dual plane or the Mopar 337, which is no longer produced so you’ll have to hunt for one.
For a street car, I’m not of the “run all the lift you possibly can” mindset. You don’t need .850” lift in that type of application. Do yourself a favor, and keep the lift and ramp speeds within reason, which will allow you to run lower spring loads, and when the right combination of parts are used..... the reliability is pretty good. I’m talking solid roller here.
That’s what I’d use if the goal is really 650+hp.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 500 stroker build
[Re: fast68plymouth]
#2517439
07/04/18 01:21 PM
07/04/18 01:21 PM
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Joined: Jan 2003
Posts: 31,041 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,041
Oregon
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Yeah the Mopar 337 is a good suggestion, I had forgotten about that one since I haven't seen any in a while. But that would probably be a decent choice if a person could find ont.
I'm enjoying the hyd roller in my 512. It is 246 at 050 and pulls hard to 6500. I think my engine was around 575 to 600 hp on the engine dyno but I'd have to pull out the sheets. I'll get it on the chassis dyno later this month and then we'll see how far it will rev and what kind of power it is making in the car.
I think I'll stick with hyd rollers for the street from now on but it does seem to be a crap shoot. I've seen more than a few hyd roller setups give up early on the dyno.
Last edited by AndyF; 07/04/18 01:22 PM.
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