Originally Posted by TomZ (Post 4801314)

Nice engine!!

Originally Posted by JaniH (Post 4760804)

Final engine specs. feel free to estimate power/torque

-Gm 502,gen6 block, bored 030 over, bores notched.
-Eagle forged crank
-Eagle 6.385 h-beam rods, l19 bolts
-Mahle -13cc dome powerpack forged pistons
-Comp ratio 9.5:1
-Quench: 0.037"
-Gm 360 casting peanut heads,ported, stock size 2,06"/1,72" ferrea stainless steel valves, intake flow with intake manifold, bad 273cfm @ 0.600" lift, good 283cfm @ 0.600" lift, exhaust 202cfm without pipe.
- Weiand street warrior 2123, dual plane intake
-Rochester q-jet 800cfm
-Crane gold 1.7 rockers
-Gm roller lifters
-Comp 930 valve springs
-Cam specs=?, will post the specs later
-Melling select series HV oil pump
-8qt marine oil pan
-merc thunderbolt ignition
-Stainless marine exhaust manifolds, 6" taller risers, vertical part of the riser extended 4" to silent choice diverters.
-Bearing clearances: mains 0.0031"(number 5=0.0039"), rods 0.0029".
-Piston to wall clearance: 0.0065"

Originally Posted by PartyRob (Post 4813368)

thanks for posting! I’m basically building the same motor. It’s a 7.4, but had a cast crank. So, since I’m replacing the crank, I’m stroking the motor. But still using peanuts. I’m not planning on running higher than 5500 rpm, so I think the peanuts will be fine. I may upgrade to aluminum heads at some point, but for now, this is it.

Originally Posted by JaniH (Post 4813375)

Sometimes you have to go what you have, and those 360 castings aint so bad at all for mild combo. i would not make full rebuild for peanut heads, too much dollars if you dont own a machine shop, but if your valve guides are in good shape, clean the bowls, reshape the short turns and get the seats cut, 30dg back cut for the valves. The stock intake port CSA is around 2.2sq" and puts your peak hp around 5000rpm with your 496cid displacement. In marine trim (wet exhaust) my engine made 507hp @5300, 564lbft @3600 saeJ1349 corrected power/tq, wich equals 530hp/590lbft STP corrected power/torque. with chevelle long tube headers, 526hp/596lbft J1349 power, wich equals 550hp/625lbft STP corrected power, so i think i can say that you dont need big valves or big intake runner to make well over 500hp marine bbc.

Originally Posted by JaniH (Post 4813338)

Bowman FH410 for coolant and bowman EC140 (3"x15") for engine oil.

Originally Posted by Rookie (Post 4813418)

That oil cooler/exchanger says that it is only rated for 200HP.

Originally Posted by JaniH (Post 4813432)

Bowman EC140-4097-4, is rated for 300kw engine

Originally Posted by Rookie (Post 4813462)

Ahh, 400HP
I thought that was a big cooler for only supporting 200HP.
If you're making 500 keep an eye on the oil temps.