525 EFI clone
03-26-2014 | 11:59 AM
#11
Thread Starter
Neno the mind boggler
Joined: Sep 2001
Posts: 13,080
Likes: 320
From: toledo oh
Much easier and less expensive to build a hopped up 500EFI clone.
502 GM Block
GM Rect port heads with some port work and Manley valves
Use a 500EFI intake and MEFI 4
GM forged crank
Manley rods
JE Pistons
Cam similar to a 525EFI cam(Crane 741 on a 114 lob sep) and matching springs
I would work with Bob M and duplicate something he has already spec'd and something that somebody already has an ECM tune for.
I would not use 525EFI heads as it limits the exhaust you can use and increases the price.
You could go to Dart Pro 1 heads or AFR's to boost the HP some more.
The 500efi intake is only good to about 600hp before it becomes a limiting factor.
502 GM Block
GM Rect port heads with some port work and Manley valves
Use a 500EFI intake and MEFI 4
GM forged crank
Manley rods
JE Pistons
Cam similar to a 525EFI cam(Crane 741 on a 114 lob sep) and matching springs
I would work with Bob M and duplicate something he has already spec'd and something that somebody already has an ECM tune for.
I would not use 525EFI heads as it limits the exhaust you can use and increases the price.
You could go to Dart Pro 1 heads or AFR's to boost the HP some more.
The 500efi intake is only good to about 600hp before it becomes a limiting factor.
Griff you are a warehouse of knowledge
which AFR's btw? Tell ya something else i like about the EFI's . . . .you can throw a towel across the tops of the intakes and lay on 'em to work on the boat
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
Last edited by glassdave; 03-26-2014 at 12:04 PM.
03-26-2014 | 07:15 PM
#13
Registered
Joined: Oct 2005
Posts: 5,825
Likes: 612
From: Clarkston, Michigan
I think that the intake manifold and throttle body are a key part of the 525. I'm also liking the intake system on the new 565 a lot. Full length headers are a must for scavenging. Dual mechanical & electric fuel pumps and fuel cooler are another interesting part of the package. Must be able to run on 87 octane. I have to disagree on using ported GM heads. When you can buy a very low hour 525 take-out for $20,000 I think that it would be hard to duplicate this engine for that amount. As pointed out earlier there are all of the bolt on pieces like pulleys, high output alternator, high output steering pump, raw water system, fuel cooler, p/s cooler, oil cooler, headers alone are 4-5G.
