HP500 buildup questions
05-06-2011, 07:23 AM
#31
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The biggest thing that will hold your build up from making really good numbers is going to be the world heads, they are STONES compared to afr's
http://racingfeed.com/downloads/chevy_flow_data.pdf
The merlins flow 320 intake/201 exhaust at .600 lift
The afr 315's flow 380 intake/296 exhaust at .600 lift
I built my first 540 almost 10 years ago running a procharger m-3 and I used MERLIN heads, the motor did not even break 700 hp under boost , when I freshened it a few years later I made 950 hp after switching to the afr's and a cam 1/2 size bigger than previously (designed by Bob Madera/RMBUILDER). Now, I know you are not building a blower motor BUT head flow is head flow and Merlins almost identical to out of the box rectangle port factory heads. Its no secret that heads that flowed 30% better than my Merlins were a big help in gaining 35% more power, this hold true in normally aspirated applications too, it WILL help make the difference between you making 540 hp and being dissappointed and making 650 hp and being satisfied, Smitty
http://racingfeed.com/downloads/chevy_flow_data.pdf
The merlins flow 320 intake/201 exhaust at .600 lift
The afr 315's flow 380 intake/296 exhaust at .600 lift
I built my first 540 almost 10 years ago running a procharger m-3 and I used MERLIN heads, the motor did not even break 700 hp under boost , when I freshened it a few years later I made 950 hp after switching to the afr's and a cam 1/2 size bigger than previously (designed by Bob Madera/RMBUILDER). Now, I know you are not building a blower motor BUT head flow is head flow and Merlins almost identical to out of the box rectangle port factory heads. Its no secret that heads that flowed 30% better than my Merlins were a big help in gaining 35% more power, this hold true in normally aspirated applications too, it WILL help make the difference between you making 540 hp and being dissappointed and making 650 hp and being satisfied, Smitty
Smitty,
Are your AFR's CNC ported like AXA's? I have alos talked with a couple of engine builders who say the some of the oil passages are too small on AFR's? Smitty what are the Part numbers of your AFR heads, and are they the Hard anadized ones you run in salt water?
BTW, Impressive motor!
Thanks,
Dean
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Last edited by Dean Ferry; 05-06-2011 at 09:02 AM.
05-06-2011, 08:07 AM
#32
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Hard anodized and inconel exhaust valves are a must too.
I just freshened up my heads, with the exception of a valve spring change in 2008, and all that needed to be done was exhaust guides, seals and a valve job. I chose to replace the Isky Tool Room springs while I had them apart. So, longevity is looking pretty good. As for the Crane roller lifters, 31 were still good! 1 was on it's way out. So lesson learned...250 hours, replace the litters too!
Dave
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05-06-2011, 10:43 AM
#33
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Smitty,
Are your AFR's CNC ported like AXA's? I have alos talked with a couple of engine builders who say the some of the oil passages are too small on AFR's? Smitty what are the Part numbers of your AFR heads, and are they the Hard anadized ones you run in salt water?
BTW, Impressive motor!
Thanks,
Dean
Are your AFR's CNC ported like AXA's? I have alos talked with a couple of engine builders who say the some of the oil passages are too small on AFR's? Smitty what are the Part numbers of your AFR heads, and are they the Hard anadized ones you run in salt water?
BTW, Impressive motor!
Thanks,
Dean
Last edited by articfriends; 05-06-2011 at 11:04 AM.
05-06-2011, 01:50 PM
#34
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BLOWERS,,, Whipple ,,, or buy a complete rotating assy and convert it to a 540cu motor....merlin heads are a bad choice,,,castings are all over the place for alignment,,,Dart Pro1 CNC 335 heads and a 240 248dur 621 632 lift cam and you will go 90+ all day,,, also carb is to small,,,,,,, you can run blowers on pump gas 89 or 93 just depends on how much boost you run,,,,,you can get an Eagle crank and H beam rods that will be fine for this build since your on a budget to build it to a 540,,, do not get headers,,, they all leak,, Stainless marine III is the way to go
05-06-2011, 09:25 PM
#35
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Hey Dean, if you're up here look us up, Dave and I are both at Hutchinsons. If you end up here boatless you can spend the day with us on the River.
If you're missing the north country check out the Raquette River action videos on the TIBBC thread in the Formula forum.
05-07-2011, 09:15 PM
#36
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There are 2 sets of flowed Dart aluminum heads sitting on my builders shelf ready to go, but we discussed this and think its best to stick with the bullet proof iron Merlins for now. He had some pretty hefty porting work done on them and we want to see what they will bring on the dyno. Now as for the cams, the ones we pulled appear to be original Merc racing (engraved MHP300 16-20-98) on the ends, but the grind number stamped on the billet is foreign to me (169516 98D2 A). We mic'ed em and they appear to be similar to the Crane 169621 grind, but I'd like to know what these are. As of now, we are leaning towards using with the Crane 16HR00004 cams (what Crane indicates were used in the HP525) for the new motors (610/632 lift - 235/244 duration @050). Any thoughts?
05-10-2011, 06:20 AM
#37
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Thanks guys
Hey Dean, if you're up here look us up, Dave and I are both at Hutchinsons. If you end up here boatless you can spend the day with us on the River.
If you're missing the north country check out the Raquette River action videos on the TIBBC thread in the Formula forum.
If you're missing the north country check out the Raquette River action videos on the TIBBC thread in the Formula forum.
Thanks for the generous invite, I'm working with HQ, (the wife
) right now on summer vacation plans. As soon as she releases the 2011 Ferry summer vacations schedule I'll know better when we will be coming. If we don't bring a boat, I'll have plenty of gas monies!
Now back to our regular HP500 programing.......
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Everything is for sale @ a certain $$
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05-16-2011, 12:15 PM
#39
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There are 2 sets of flowed Dart aluminum heads sitting on my builders shelf ready to go, but we discussed this and think its best to stick with the bullet proof iron Merlins for now. He had some pretty hefty porting work done on them and we want to see what they will bring on the dyno. Now as for the cams, the ones we pulled appear to be original Merc racing (engraved MHP300 16-20-98) on the ends, but the grind number stamped on the billet is foreign to me (169516 98D2 A). We mic'ed em and they appear to be similar to the Crane 169621 grind, but I'd like to know what these are. As of now, we are leaning towards using with the Crane 16HR00004 cams (what Crane indicates were used in the HP525) for the new motors (610/632 lift - 235/244 duration @050). Any thoughts?
The 525EFI cam is a good choice. Its a Crane 168741 ground with a 114 lob sep.
