NIB custom ET Performance 245's
05-08-2007, 10:15 PM
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NIB custom ET Performance 245's
They're new 245cc runner ET performance cylinder heads with around $2000 worth of extra machine work and porting. They've been angle milled 1* so they're now a 10* cylinder head. The intake flange and bolt hole faces were all corrected for the angle mill, but you might need to run a little thicker intake gasket now to get the manifold fit back to where it needs to be. The combustion chambers have been totally overhauled and mirror polished, they measure 64cc's and are setup for a 4.030 bore. They have a custom 45* intake valve job cut on a 2.125 instead of the 2.08, and the exhaust is a custom 50* seat valve job cut at a 1.550. The intake ports have also been overhauled and now are up about 20cfm over what they were from ET Performance. The intake pushrod holes have also been sleeved to run a much larger pushrod on the intake side. I also have valves with these, they're 5/16 2.125's intake(backcut was changed from rev back cut to maximize flow), and 1.600 rev exhaust valves cut down to a 1.550 and put on a 50* seat to insure there was a nice thick margain on the exhaust side. Also these heads have been flowed on 2 seperate flow benches, a SF600 and a SF1020 Probench, both of which read a little low over average. The SF1020 reads about 10cfm low over Weld Tech's bench so on some other benches these things could flow upwards of 370cfm. $2200 plus shipping... need to get rid of these ASAP.
Flowed at 28* of water
.200 lift: 149cfm
.300 lift: 225cfm
.400 lift: 281cfm
.450 lift: 302cfm
.500 lift: 325cfm
.550 lift: 340cfm
.600 lift: 354cfm
.650 lift: 362cfm
.700 lift: 344cfm
Also i need to add that these were done to be a max effort ls1 head, not so much for a street car and would probably work best with a sheet metal or a single plane manifold.
Flowed at 28* of water
.200 lift: 149cfm
.300 lift: 225cfm
.400 lift: 281cfm
.450 lift: 302cfm
.500 lift: 325cfm
.550 lift: 340cfm
.600 lift: 354cfm
.650 lift: 362cfm
.700 lift: 344cfm
Also i need to add that these were done to be a max effort ls1 head, not so much for a street car and would probably work best with a sheet metal or a single plane manifold.
Last edited by git_sum; 05-14-2007 at 11:25 AM.
05-09-2007, 09:00 AM
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I did all the work, I went to SAM. Had a few opportunities to work elsewhere, had a job lined out at CRD(5liter 24hour of lemans ls1 prototype engiens) doing the cylinder heads there but that didn't work out, got a job offer from Joe Gibbs Racing and turend it down and am now in the process of opening up my own shop and i need to get rid of these because i need some more money to get the business going.
05-09-2007, 07:10 PM
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Yea i can, what is it that you need done. And i'm not real sure what i would have been doing at JGR, something in the engine department. I would of had to of went for the interview before i would have known for sure.
05-12-2007, 09:59 PM
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These heads would make killer power on any 4inch + bore engine. These heads from ET with just valves would almost run you this much, not counting all the extra work to make these cylinder heads as good as they are.
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