How much HP
03-09-2007, 10:15 AM
#11
It should be at around 520-530 Not going to an aluminum head cost you about 75 hp.
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03-09-2007, 10:34 AM
#12
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Less 75 hp = less 3-4 mph
I also ran out of funds cause knowing that I was upgrading the engine, I had get a full dual ram hydraulic steering as well, and that means more $$$$$
03-10-2007, 04:17 AM
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03-10-2007, 07:58 AM
#15
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JimV is a member here on OSO. Here is his website.
http://hometown.aol.com/valakoracehe...raceheads.html
http://hometown.aol.com/valakoracehe...raceheads.html
03-10-2007, 08:30 AM
#16
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520-540 hp my guess,the intake your using makes good low end torque but suffers on top end,even with runners shorten.Stock gm heads hold engine back,aluminum afr hard coat anodized with cnc porting worth 50-70 hp with same camshaft,I have also used dart iron eagles,they make good power,although donnot use the first versions of them(5-7years ago)they use to crack and fill your engine full of water.Dart stop making them,but then put them back into production,claimed the problem was in the harding process and they got it all straight.We work on these type of engines all the time and dyno test every thing we build
03-10-2007, 11:12 PM
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If you did nothing except put the 741 cam in it, you would be at 525 HP,(or more) as thats the setup that Merc uses on the 525 EFI. Just putting any aluminum heads on isn't always good for anything. Aluminum heads by themselves are not magic. Yea, using AFR's will gain big numbers for a big check. If you have taken your rect port GM heads, and done a decent port job on them, you will be amazed at how well they work. The same applies to your intake. Add the decent exhaust, CR of about 9-1 and I'll stand by my number.
I was thinking somewhere around 525. Well that's good news. So I should expect high 70's on my 22 scarab.
03-12-2007, 10:38 AM
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If you did nothing except put the 741 cam in it, you would be at 525 HP,(or more) as thats the setup that Merc uses on the 525 EFI. Just putting any aluminum heads on isn't always good for anything. Aluminum heads by themselves are not magic. Yea, using AFR's will gain big numbers for a big check. If you have taken your rect port GM heads, and done a decent port job on them, you will be amazed at how well they work. The same applies to your intake. Add the decent exhaust, CR of about 9-1 and I'll stand by my number.
Thanks
03-12-2007, 11:44 AM
#19
Just be aware that the stock GM rectangle port heads have a tendency to CRACK between the seats. If you can't afford aluminum heads at least replace the cast iron GM heads with some good aftermarket cast iron heads if you can swing it. Otherwise, you're taking a risk with the GM heads cracking---I have seen it happen to guys many times over the years---especially after they have dumped a lot of their hard earned $$$ into their engine projects. Have fun.
03-12-2007, 11:56 AM
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Just be aware that the stock GM rectangle port heads have a tendency to CRACK between the seats. If you can't afford aluminum heads at least replace the cast iron GM heads with some good aftermarket cast iron heads if you can swing it. Otherwise, you're taking a risk with the GM heads cracking---I have seen it happen to guys many times over the years---especially after they have dumped a lot of their hard earned $$$ into their engine projects. Have fun.
