302DZ Crossram build
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Joined: Feb 2017
Posts: 4,174
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From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
302DZ Crossram build
No, not another 302 cid engine build.
But if you had the crossram intake (either single or dual) and were determined to put a SBC under it, what would you choose for street use? Assume your typical street car - 3500#, 3.73 rear gear, 28" tall tires, shift at 7000 rpm, no racing fuel. I love 8000, but let's be practical here. And 6000 rpm is boring.

I guess that Grumpy already had this discussion: the cross ram intake | Grumpys Performance Garage
... keep in mind that the cross-ram intake works best on a 350-406 with a cam and gearing that keeps the engine in the 3500rpm-7000rpm band, so both the cam and the intake design match that OPERATIONAL RPM BAND and REQUIRES a decent set of high flow rate heads, (generally look for heads that reach or exceed 250cfm at .600 lift) with a matching 10.5:1-12.5:1 cr and generally a 4.11:1-4.56:1 rear gear and manual transmission, when road racing, to operate correctly in its intended rpm band and flow rate. you could drop back to a 3.73:1-3.90:1 on a street car.
What do you think?
But if you had the crossram intake (either single or dual) and were determined to put a SBC under it, what would you choose for street use? Assume your typical street car - 3500#, 3.73 rear gear, 28" tall tires, shift at 7000 rpm, no racing fuel. I love 8000, but let's be practical here. And 6000 rpm is boring.I guess that Grumpy already had this discussion: the cross ram intake | Grumpys Performance Garage
... keep in mind that the cross-ram intake works best on a 350-406 with a cam and gearing that keeps the engine in the 3500rpm-7000rpm band, so both the cam and the intake design match that OPERATIONAL RPM BAND and REQUIRES a decent set of high flow rate heads, (generally look for heads that reach or exceed 250cfm at .600 lift) with a matching 10.5:1-12.5:1 cr and generally a 4.11:1-4.56:1 rear gear and manual transmission, when road racing, to operate correctly in its intended rpm band and flow rate. you could drop back to a 3.73:1-3.90:1 on a street car.
What do you think?
Last edited by NoEmissions84TA; Feb 13, 2026 at 07:27 PM.
Re: 302DZ Crossram build
I build engines. Mostly circle track, lots of resto-mod stuff, and a bit of drag race plants. With sbc builds my go to's are 383 based for torque and 377 based for high rpm and HP. Even built a stroker 305 once with a DZ302 cam. Was a very lineal power.
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