Engine Quest Head work results
05-04-2016 | 05:06 AM
#102
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Joined: Aug 2011
Posts: 2,733
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From: bel air, md
On a 532 with Eq 320's at 9.5:1 motor made 650hp @5700 small cam. I bet these heads would go 700 with the right cam on a 540" motor. Spend some money on port work, tunnel ram 2-4's and who knows 750-800???
The 532 made 650/650...
Last edited by Black Baja; 05-04-2016 at 05:11 AM.
05-04-2016 | 05:37 AM
#103
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Joined: Nov 2004
Posts: 14,104
Likes: 3,692
From: On A Dirt Floor
Yup, like 60-70hp increase going to carb. Been a few builds up's exactly same (including same heads(RHS,now EQ, identical cam, same 502-509cid and compression) with carburetors. 600-620hp.
EFI too using the Holley EFI intake
Last edited by SB; 05-04-2016 at 05:41 AM.
05-04-2016 | 06:34 AM
#105
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Good info guys.
Black Baja, Im surprised the 454 made any power with a 320cc cylinder head. I was told a 320cc head on a 454 would equal a gutless turd
Seriosuly though, its nice to see theres another iron head option for us performance boaters out there.
Black Baja, Im surprised the 454 made any power with a 320cc cylinder head. I was told a 320cc head on a 454 would equal a gutless turd
Seriosuly though, its nice to see theres another iron head option for us performance boaters out there.
05-07-2016 | 09:31 AM
#108
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Joined: Nov 2004
Posts: 14,104
Likes: 3,692
From: On A Dirt Floor
MT - is your exhaust on yet ?
If not, and I mentioned this before, would be cool (and good) to see how the exhaust ports compare to the exhaust.
I kind of wish more people (including myself at times) would check to see if the exhaust manifold port openings don't protrude over the cyl head port openings. The times I had done this on automobiles, usually proved worthwhile,
Only takes about 15 minutes or so.
I've usually described how to do it, but looking for an article I can link instead, just found this on Stahl's site that explains it.
http://www.stahlheaders.com/ports.htm then scroll to 2nd half of page.
If not, and I mentioned this before, would be cool (and good) to see how the exhaust ports compare to the exhaust.
I kind of wish more people (including myself at times) would check to see if the exhaust manifold port openings don't protrude over the cyl head port openings. The times I had done this on automobiles, usually proved worthwhile,
Only takes about 15 minutes or so.
I've usually described how to do it, but looking for an article I can link instead, just found this on Stahl's site that explains it.
http://www.stahlheaders.com/ports.htm then scroll to 2nd half of page.
Last edited by SB; 05-07-2016 at 09:33 AM.
05-08-2016 | 10:26 AM
#109
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
MT - is your exhaust on yet ?
If not, and I mentioned this before, would be cool (and good) to see how the exhaust ports compare to the exhaust.
I kind of wish more people (including myself at times) would check to see if the exhaust manifold port openings don't protrude over the cyl head port openings. The times I had done this on automobiles, usually proved worthwhile,
Only takes about 15 minutes or so.
I've usually described how to do it, but looking for an article I can link instead, just found this on Stahl's site that explains it.
http://www.stahlheaders.com/ports.htm then scroll to 2nd half of page.
If not, and I mentioned this before, would be cool (and good) to see how the exhaust ports compare to the exhaust.
I kind of wish more people (including myself at times) would check to see if the exhaust manifold port openings don't protrude over the cyl head port openings. The times I had done this on automobiles, usually proved worthwhile,
Only takes about 15 minutes or so.
I've usually described how to do it, but looking for an article I can link instead, just found this on Stahl's site that explains it.
http://www.stahlheaders.com/ports.htm then scroll to 2nd half of page.
Ran mine on the dyno yesterday.
468ci
8:1 static
EQ heads
236/245 114 LSA .630/.630 lift cam
Stellings green headers with 1 7/8 primarys and 4" tails
B&M 420 blower with chiller
Ran in full marine trim, made 818HP with 8psi boost.
My last combo, was same shortblock, dart heads, 9:1 static, no chiller, same cams, made 800HP with no accessories, 2.25ID open dyno headers, 7lbs boost. Hard to compare, as major changes made, plus totally different dyno.
I will say, I had to add a chit ton more jetting to get the AFR's to where they were with old combo. Guess the boat will tell the story as far as if I am making more power in the boat.
05-23-2016 | 10:12 PM
#110
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
Ran and made final tuning adjustments with the boat I built the MPI's for yesterday. So far I've seen a 500rpm gain.
No idea what speed but the old setup was spinning 5000. New setup is 5500 with full load of fuel and two guys.
I'm gonna guess mid 70's mph. I was too busy with watching AFR's while monitoring MAP readings and making tuning adjustments to the fuel table to see how fast we were going. But anyway, the 500 rpm gain tells the story of the power the package I built has over stock.
No idea what speed but the old setup was spinning 5000. New setup is 5500 with full load of fuel and two guys.
I'm gonna guess mid 70's mph. I was too busy with watching AFR's while monitoring MAP readings and making tuning adjustments to the fuel table to see how fast we were going. But anyway, the 500 rpm gain tells the story of the power the package I built has over stock.
