273 said

Here's a stock high cr 340 with various upgrades, so say if you took 20 hp or so off each peak for lower cr and 1.88 valve.

If you look at that 360 video in post #6 it final stage of mods is similar to phase 6 of this 340 making around 385 hp but stock cr.


Phase 1:Stock 340 baseline, Chrysler electronic ignitionPhase 2:Replace small production AVS with Edelbrock 800 CFM carbPhase 3:Replace factory HP manifolds with Hooker 151/48-inch headersPhase 4:Replace factory iron 340 HP intake with Edelbrock Performer RPM Air GapPhase 5:Replace SSI springs and retainers with Engle #604LS retainers and #993 springsPhase 6:Replace stock 340 HP cam with Comp Xtreme Energy 268

Dyno Results
Westech Performance Group
Superflow Dyno
Horsepower
RPM	Phase 1	Phase 2	Phase 3	Phase 4	Phase 5	Phase 6
3000	185.2	195.5	199.6	206.4	206.2	214.7
3200	195.4	206.1	213.9	220.7	220.8	229.3
3400	208.9	224.6	233.0	240.6	240.5	251.5
3600	224.8	238.7	252.7	260.8	259.9	275.7
3800	236.4	253.7	266.6	277.0	276.9	298.1
4000	249.5	267.6	280.0	291.8	291.8	311.7
4200	259.3	278.9	292.9	306.0	306.2	327.1
4400	265.0	287.1	304.3	321.3	321.3	344.6
4600	268.8	297.2	313.3	335.2	334.7	355.9
4800	274.7	306.8	321.1	343.1	342.5	366.7
5000	278.5	312.7	329.1	352.6	350.4	377.0
5100	280.2	316.9	330.6	354.5	352.4	381.3
5200	281.3	316.9	330.8	353.6	353.6	384.3
5400	273.7	314.9	329.3	350.8	355.4	386.1
5500	273.5	313.9	330.4	350.7	355.9	387.4
5600	269.3	314.5	330.2	350.9	353.5	389.4
5700		312.7	329.3	348.6	353.3	391.6
5800		308.8	326.2	347.6	351.4	387.2
6000				329.2	353.4	383.7
6200					314.8	373.7

https://www.motortrend.com/articles/mopp-0102-1970-340-high-performance-mill-dyno/

Click to expand...