500 to 525
#14
Platinum Member
Platinum Member
We use the 525: system with great results. Dustin Whipple does our tuning. You should be able to use your stock heads, the intake is the limiting factor.
#16
As said before. Strongly recommend checking with Mark at precision or Eddie young. Intake and injectors are a huge limiting factor to these engines. Save yourself time and money and listen to what they say and what packages they have made work.
#17
Platinum Member
Platinum Member
The 525 head is made for Merc by Edelbrock, really nothing special. The head off a hp500 carb is really pretty close. If he is going to keep it close to stock they should work ok. He will have to make a few spacers to get his belts to align because of the crank target wheel. Unless he has the newer version with it under the timing cover.
#18
Charter Member # 55
Charter Member
Stock 525EFI cam will work well.
525EFI's are 525hp at the prop and dyno in the 560-570hp.
I agree with talking to Young Perf or Precision Marine before you buy parts. They may have a parts list for a similar build and have a PCM tune ready.
525EFI's are 525hp at the prop and dyno in the 560-570hp.
I agree with talking to Young Perf or Precision Marine before you buy parts. They may have a parts list for a similar build and have a PCM tune ready.