502 rebuild
#32
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Join Date: Oct 2018
Location: California
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Afr 305 vs 325
One builder is wanting to go with 305 for the smaller valve size another is telling me run the 325 that the bore is plenty big enough. Only looking for around 625HP. Any thoughts
thanks !!
thanks !!
#34
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You won’t make 600+ NA in full marine trim without sweeper style headers. Manifolds and etops just don’t have long enough runners. Even the 525 has sweeper headers to help with its power. Eickert manifolds would be the only manifold capable but they have long runners also. Don’t know which “builders” you’re referring too but talk to mark rinda at Mer performance or eddie young at young performance. Those are 2 quality guys who will lead you in the right direction to make the best power within budget. Remember budget is the most important. Cheap, fast, reliable. Pick 2
#35
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Lots of good recipes for 509's. Endeavour32 purchased a couple of used ones from tinkerer a few years back that made well over 600 hp. I might be wrong but seems like they made just under 650. (Doubt marine dressed and likely dyno headers). Tinkerer would be able to tell you more than likely. Pretty simple builds with dart pro one 310 heads with Dart intakes worked over and set up by Valako. Holley hp 950 carbs and 741 cams. Boat ran very well. After a season I believe endeavour32 swapped out intakes to Brodix hv2000's and quick fuel 1000 carbs and made some very worthy gains on the water. Reliable builds and made great power. Only thing I may have missed was the 1.8's on the intakes.
I'm not certain what they CC'd out at after the heads were ported however I'd imagine around 325. Like I said there are many ways you can achieve your goals but just thought I'd share.
Very important to be sure and have your heads set up properly for marine use what ever route you choose to go.
I'm not certain what they CC'd out at after the heads were ported however I'd imagine around 325. Like I said there are many ways you can achieve your goals but just thought I'd share.
Very important to be sure and have your heads set up properly for marine use what ever route you choose to go.
#36
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Those Tinkerer/Endeavor motors had the Eickert/now Diamond Performance exhaust Diamond Performance Parts on them. Every boat that has had these exhausts have been over achievers.
#38
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Here are the specs on my old engines.
509 CI
10:1 compression (I think)
Crane 741 cam
1.8/ 1.7 Crane Gold rockers
Brodix HPV 2001 intakes
Dart Pro 1 310 heads- ported by Jim Valako (320 cc after porting)
Dominator AED carbs 1050's
Daytona Sensor Ignition with stock thunder bolt distributor
Eickert Exhaust
This was a he!! of a combo- originally it came with Dart single plane intakes and Holley 950 hp carbs. Moving up to dominators really helped pick up some power. This combo pushed a Formula 292 to 88 mph. That is not a fast hull, and needs around 650 hp a side to hit those speeds.
If you are only building one engine, I have a new in the box Daytona ignition I'll make you a deal on.
509 CI
10:1 compression (I think)
Crane 741 cam
1.8/ 1.7 Crane Gold rockers
Brodix HPV 2001 intakes
Dart Pro 1 310 heads- ported by Jim Valako (320 cc after porting)
Dominator AED carbs 1050's
Daytona Sensor Ignition with stock thunder bolt distributor
Eickert Exhaust
This was a he!! of a combo- originally it came with Dart single plane intakes and Holley 950 hp carbs. Moving up to dominators really helped pick up some power. This combo pushed a Formula 292 to 88 mph. That is not a fast hull, and needs around 650 hp a side to hit those speeds.
If you are only building one engine, I have a new in the box Daytona ignition I'll make you a deal on.
Last edited by endeavour32; 11-02-2018 at 04:27 PM.
#39
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Thanks for catching my mistake on the intake and carb combo. For some reason I thought you stayed 4150. You did forget to mention your custom made hatch air ports. That boat starved for air after your engine swaps. Makes ya wonder if most consider after almost doubling NA power. When in doubt crack the hatch. lol
#40
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Thanks for catching my mistake on the intake and carb combo. For some reason I thought you stayed 4150. You did forget to mention your custom made hatch air ports. That boat starved for air after your engine swaps. Makes ya wonder if most consider after almost doubling NA power. When in doubt crack the hatch. lol