340 or 408?

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Couldn't find a 500+ hp 340 build but here's a little more than you wanted 592 hp @ 7,100/7,200 rpm
460 tq @ 6,000 rpm 400 tq @ 4,000 rpm, 12.5 cr W2 tunnel 263°/268° @ 0.050" solid cam'd 345.

You go a little on everything you get a little less hp.

https://www.motortrend.com/articles/mopp-0205-340-big-block-engine-buildup/

https://www.motortrend.com/articles/mopp-0206-340-big-block-engine-buildup/

RPMFt/LbHPBSFC LBS/HR
4000400.3300.9.392
4500421.6361.2.385
5000459.0437.0.373
5200459.3454.7.381
5400458.0470.9.379
5600454.9485.0.392
5800449.9496.8.396
6000460.1525.7.415
6200454.0535.9.435
6400452.0550.9.438
6600457.7575.2.436
6800446.8578.5.442
7000439.2585.4.457
7100437.7591.7.550
7200431.6591.6.586
7400414.4583.9.552
7500407.1581.4.536
 
273 said:
Couldn't find a 500+ hp 340 build but here's a little more than you wanted 592 hp @ 7,100/7,200 rpm
460 tq @ 6,000 rpm 400 tq @ 4,000 rpm, 12.5 cr W2 tunnel 263°/268° @ 0.050" solid cam'd 345.

You go a little on everything you get a little less hp.

https://www.motortrend.com/articles/mopp-0205-340-big-block-engine-buildup/

https://www.motortrend.com/articles/mopp-0206-340-big-block-engine-buildup/

RPMFt/LbHPBSFC LBS/HR
4000400.3300.9.392
4500421.6361.2.385
5000459.0437.0.373
5200459.3454.7.381
5400458.0470.9.379
5600454.9485.0.392
5800449.9496.8.396
6000460.1525.7.415
6200454.0535.9.435
6400452.0550.9.438
6600457.7575.2.436
6800446.8578.5.442
7000439.2585.4.457
7100437.7591.7.550
7200431.6591.6.586
7400414.4583.9.552
7500407.1581.4.536
Click to expand...


I’ll have to read that one later. Is that pump gas??
 
9secRR said:
11.4 comp
W2 heads, flow 286
Indy intake
264/268 @ .050 Hughes SFT
Ductile iron rockers
3.46” stroke
BME aluminum rods
904
5600 stall
4.86 gear
2700 lbs
Click to expand...
May I inquire into your oiling system. What does it take to keep the rod bearings alive in your set up. I lost #7 on my 340 some years ago. After it was rebuilt it survived plenty of 6700 rpm pulls street racing, yet I lacked confidence in camming it up more. Surely your spinning your combination up far higher than I did, and I would like to have confidence in getting into the mid 7000 rpm range.
 
Illahe said:
May I inquire into your oiling system. What does it take to keep the rod bearings alive in your set up. I lost #7 on my 340 some years ago. After it was rebuilt it survived plenty of 6700 rpm pulls street racing, yet I lacked confidence in camming it up more. Surely your spinning your combination up far higher than I did, and I would like to have confidence in getting into the mid 7000 rpm range.
Click to expand...
there is zero oiling mods done. engine has been together since 2021 and it does see 7400 rpm at the top end.
 
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