Thread: Dyno-Sim combinations

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I was asked to do this sim on a PM.....

428 Ford FE, bored 0.030" to 4.165". Stroke 3.980", 433 CID.
Edelbrock 60069 heads. I used the flow numbers that Edelbrock publishes for this head.
Tunnel Ram single plane intake mounting two 660 carbs.
Zoomie headers.
CompCams 33-781-9 solid roller cam, installed straight up at 106 ICL.
33-781-9 - Magnum
Advancing or retarding the cam lost power over installing straight up.
9.97:1 static compression ratio. 7.96:1 dynamic compression ratio on the KB calculator.

RPM HP TQ
2000 105 277
2500 198 417
3000 272 476
3500 344 516
4000 424 557
4500 502 586
5000 567 595
5500 606 579
6000 630 551
6500 619 500

Peak volumetric efficiency 111.2% @5500
Peak BMEP 207.0 psi @5000

This cam would prefer another full point of static compression ratio, from 9.97:1 to 10.97:1. It would make 655 HP @6000 and 615 FT/LBS @5000, with a dynamic compression ratio of 8.7:1. The builder should observe that the Edelbrock springs, if he uses the Edelbrock springs, are good to 0.600", while valve lift is 0.645" with the Comp cam. Check closely for piston to valve, retainer to guide clearance as well as checking for stacking solid of the spring coils. This is a solid cam and you have the margin of valve lash, so it might be ok.