408 on dyno, what will it make?

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gregsdart

gregsdart

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Dyno session tomorrow!
Take a stab at what this combo will make.
408, 10.1/1 compression, EQ heads with 2.02 intake valves, bowl ported, 272 cfm at .600 flow. 850 quick fuel Q, Comp 235/249/107 duration. @ .050 cam with about .560 intake lift, Airgap intake on top of 1 inch open spacer, dyno headers, probably 1 7/8 tubes.
Second guess on power;
the motor will be tested with 1 5/8 step to 13/4 with 3 inch by 18 collectors, 14×3 air cleaner with high flow lid.
What do you think it will make in each mode?
 
I'm going to say 500ish with the dyno headers, I think it would like a Weiand X-Cellerator if you can find one.
 
Dinky cam, even for that compression, but it should make somewhere between 475-500, depending on exhaust.
My old 318 enginemasters motor made 477 with dyno headers, identical flow number on heads, and an airgap knockoff. Cam was 248@ 50 with 10.44 compression. Lot of little tricks in the motor though, obviously, to make that at 323 cubes.
This 408 should make a little more than that i would think, maybe not.
 
Forgot to mention cam is in at 105. So far most are close to what I hope for, 480 to 500 hp.
 
Mine makes over 500 hp and 500 FT torque. Your should be very close to that.. IMO
 
Late flow and smallish cam, doh.

1 5/8 489hp 502 tq

1 7/8 499hp 512 tq

The 850 on top will help it get there with the cam split and big primary.
Who came up with this combo and do you have any .200-.500 lift flow numbers?
 
0823171625.jpg
Results are in IMMs' Brian Halfegers' estimate of 470 to 490 Hp was a bit conservative because he didn't do the heads. He did however pick out and supply the basic combo, and give me a baseline for tuning. They were done locally in Minnesota by Brian Hansen at R&R performance in Spring Lake Park Minnesota. Brian at R&R did a fine job on the block machine work and bowl porting the heads after installing 2.02 valves. So a big thanks to both Brians!
The numbers!
504 hp at 5700 and 5800 rpm! Torque peaked at 518 ft lbs at 4600 rpm.
 
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gregsdart said:
Results are in IMMs' Brian Halfegers' estimate of 470 to 490 Hp was a bit conservative because he didn't do the heads. He did however pick out and supply the basic combo, and give me a baseline for tuning. They were done locally in Minnesota by Brian Hansen at R&R performance in Spring Lake Park Minnesota. Brian at R&R did a fine job on the block machine work and bowl porting the heads after installing 2.02 valves. So a big thanks to both Brians!
The numbers!
504 hp at 5700 and 5800 rpm! Torque peaked at 518 ft lbs at 4600 rpm.
Click to expand...
Those are the numbers I first guessed, then went conservative and edited down 5 hp.
Congrats, hope you love it.
 
Some pics,,,, 1 3/4 Dyno headers

0823171625.jpg
 
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Curve. I am surprised it went over 500 hp with the Airgap dual plane!

0823171636.jpg
 
A big thanks also to Ron Quanstrom at R&R for his expertise in finding the power! It is always fun to watch a master at work!!
 
MOPAROFFICIAL said:
Late flow and smallish cam, doh.

1 5/8 489hp 502 tq

1 7/8 499hp 512 tq

The 850 on top will help it get there with the cam split and big primary.
Who came up with this combo and do you have any .200-.500 lift flow numbers?
Click to expand...

0623171739.jpg
 
MOPAROFFICIAL said:
There it is. With 272 @.600 I was assuming a 248-255 @.500, that intake does well right there.
Click to expand...
These heads have no extra work beyond a bowl blend for the 2.02 valves. Stock guide bosses, stock pinch area. I am impressed with that.
 
Wow... I am impressed! That is a pretty straight forward build .
I am doing a similar motor but with W2s and solid roller. Cam specs yet to be determined.
I will feel pretty dumb/humbled if I spend all that money and you outpower me...lol
 
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