Need engine advice N A 598 cubic inch rebuild
12-31-2014 | 02:55 PM
#102
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From: chicago
12-31-2014 | 03:08 PM
#103
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From: yorkville,il
12-31-2014 | 03:14 PM
#104
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From: taxachusetts
12-31-2014 | 05:41 PM
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From: bel air, md
12-31-2014 | 07:51 PM
#106
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From: Moscow OH.
12-31-2014 | 08:11 PM
#107
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From: Vancouver BC
Yessir, 9.8 to 1, 89 octane, similar sized cam to what you're running, maybe a hair smaller. 2000cfm throttle body, Holley efi intake. It was a low rpm deal, made 770hp. I built a 600" with AFR 305's last year. I wouldn't try to argue with anyone that those are the right heads for a 600" motor, but it worked really well for it's application, and the throttle response was nothing short of violent. It made 705hp and 740 tq through a set of Dana's. I do a lot of engines for big white water jet boats that have a very narrow efficient rpm range so I experiment a lot with different combos. When the pump manufacturers are designing new impellers, they use a shaft dyno to calculate the KW absorption of the impeller. My dyno numbers always match the numbers in the boat. The 357's are a killer head, and a perfect match for a 598 if, in my opinion, you were shooting for 850-900hp. I was just saying that on an engine that mild, I couldn't see spending the money on them. I'd go with cheaper heads and buy shaft rockers instead. 
https://youtube.com/watch?v=I1XC7qqFY9E
https://youtube.com/watch?v=I1XC7qqFY9E
12-31-2014 | 08:13 PM
#108
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From: Moscow OH.
S30, that's a pretty expensive set of heads to only make 740hp with. If that's all you were shooting for, the 325's out of the box would do it no problem.
Mayor, sounds like a great build, and is right where it should be on power with the components you used. Obviously there's a fair bit of power potential left with a cam swap, given the cubes and compression. But, realistically do you need any more? It will be a very reliable combo I'm sure.
Mayor, sounds like a great build, and is right where it should be on power with the components you used. Obviously there's a fair bit of power potential left with a cam swap, given the cubes and compression. But, realistically do you need any more? It will be a very reliable combo I'm sure.
Last edited by the mayor; 12-31-2014 at 08:17 PM.
12-31-2014 | 10:21 PM
#109
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From: Houston, TX
Yessir, 9.8 to 1, 89 octane, similar sized cam to what you're running, maybe a hair smaller. 2000cfm throttle body, Holley efi intake. It was a low rpm deal, made 770hp. I built a 600" with AFR 305's last year. I wouldn't try to argue with anyone that those are the right heads for a 600" motor, but it worked really well for it's application, and the throttle response was nothing short of violent. It made 705hp and 740 tq through a set of Dana's. I do a lot of engines for big white water jet boats that have a very narrow efficient rpm range so I experiment a lot with different combos. When the pump manufacturers are designing new impellers, they use a shaft dyno to calculate the KW absorption of the impeller. My dyno numbers always match the numbers in the boat. The 357's are a killer head, and a perfect match for a 598 if, in my opinion, you were shooting for 850-900hp. I was just saying that on an engine that mild, I couldn't see spending the money on them. I'd go with cheaper heads and buy shaft rockers instead.
https://youtube.com/watch?v=I1XC7qqFY9E
https://youtube.com/watch?v=I1XC7qqFY9E
