dynamic compression calculator available
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Posting Guru
Joined: Aug 2005
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From: NE Ga
ya i'm lookin at having close to .060 quench with .025 deck clearance and .035 gasket. i'm hoping it doesn't cost too much to get my block decked. got any idea what would be a safe amount to take off w/o running into prob's with the intake and valve covers?
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From: Colville, Washington
I don't have any "official" info. but I know my block was decked about .010" and my heads had been milled at least twice. I had to mill for the intake alignment. I think, opinion only, that you could mill up to .020 and still be able to install the intake without any issues.
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From: Colville, Washington
DynoSim shows about 400 hp and 500 ft lb of torque. Remember I do not have flow numbers even for un ported C1AE-A heads so some guesswork is involved. I think I am realistic on the specs I have entered. The torque is above 400 ft lbs from 2000-4000 RPM, it pulls real hard.
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From: NE Ga
man i bet thats some more nasty setup. your dynomax headers-are they the 259.99 set? if so have you been pretty happy with them as far as leaking/warping with the miles you've put on your truck? was just gonna go with the 309.99 heddmans but i have a hard time swallowing that when i can save 50 or so.
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From: Colville, Washington
I had two issues with the Dynomax headers #86041. I did get the coated ones. I am using Victor NitroSeal gaskets and I milled both the head surface and the header flange(after my welding) and have had ZERO leak problems.
1. I had to weld an extra bead outside the stock bead on the head/header flange. My ports were too large for the Dynomax flange.
2. The clutch fork hit the collector, so I had to modify the fork for clearance, there are pictures in my gallery of that modification.
I rechecked my Dyno Sim numbers at 1500 RPM I show 419 TQ and at 6000 416 TQ, at 4000 an even 500.
1. I had to weld an extra bead outside the stock bead on the head/header flange. My ports were too large for the Dynomax flange.
2. The clutch fork hit the collector, so I had to modify the fork for clearance, there are pictures in my gallery of that modification.
I rechecked my Dyno Sim numbers at 1500 RPM I show 419 TQ and at 6000 416 TQ, at 4000 an even 500.
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From: NE Ga
so you had to weld a bead around the actual edge of the header flange, out around where the bolt hole is? why were your ports larger anyways? roughly how many miles have you put on your headers since install? thanks
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From: Colville, Washington
No, not around the edge of the flange, just outside the bead from the factory. The C1AE-A heads have some large ports to start with and then I made'em bigger!!
Somewhere in the neighborhood of 40k miles. I used it for a daily driver for 4 years and then for horse trailer duty after that.
I am sure that you would not have the problem with most later heads. I would get whatever headers you are going to run and then port match to that size.
Somewhere in the neighborhood of 40k miles. I used it for a daily driver for 4 years and then for horse trailer duty after that.
I am sure that you would not have the problem with most later heads. I would get whatever headers you are going to run and then port match to that size.
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From: NE Ga
ok good to know Putt, thanks for the info. I'm planning on building my 390, breaking it it, driving it about 100-200 miles all with stock logs and then swapping to headers so i'll be able to feel that 30-40 hp difference. I think it'll be a fun experiment! thanks agian!
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