pistons?
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
I had a set of D2TE-AA heads CC'd, they came out to 73, so I'll use that.
Those pistons have a 20cc dish.
The Fel-Pro head gasket is .041" thick.
Using the above, we come up with 8.69:1 compression.
Is that wrong? I dont know, depends on the rest of the motor and what you intend to use it for.
If you changed out the head gaskets to .020" Mr. Gasket steel shims, you'd have 9.13:1.
Those pistons have a 20cc dish.
The Fel-Pro head gasket is .041" thick.
Using the above, we come up with 8.69:1 compression.
Is that wrong? I dont know, depends on the rest of the motor and what you intend to use it for.
If you changed out the head gaskets to .020" Mr. Gasket steel shims, you'd have 9.13:1.
Thread Starter
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More Turbo
Joined: Sep 2002
Posts: 513
Likes: 0
From: Alberta
I've got it in a 6500lb crewcab and I pull a trailer quite a bit. Cam is a crane 343901, heads are pocket ported, headers, dual 2 1/2" exhaust with flowmasters, 600cfm Vac Sec Holley on stock 4v intake. It just doesn't seem to have the snort everyone talks about on here. I used to have the Comp 268H cam which had a bit more mid to upper power but the crane has more low end I think.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
I'd suspect more of a tuning issue than a problem with the motor. Even then, in a big heavy crewcab, you cant expect a lot of acceleration.
Check your timing. Read the plugs. Make sure the secondaries are opening.
Check your timing. Read the plugs. Make sure the secondaries are opening.
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More Turbo
Joined: Sep 2002
Posts: 513
Likes: 0
From: Alberta
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well did you try different setups, like different secondary springs, power valves, jetting? How do the plugs read? How much timing are you running?
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More Turbo
Joined: Sep 2002
Posts: 513
Likes: 0
From: Alberta
This motor was brand new 2 years ago and I'm a little pi**ed if it is only 8.7:1 compression. Everything I have read on this site says you need more compression to get decent power.
Posting Guru
Joined: Oct 2005
Posts: 1,235
Likes: 2
put in the .020 head gaskets.. already had a good 360 short block laying around and the 390 toasted all the rods bearings after the oil pump locked up due to valve stem seals, so the crank was thrashed.. just threw in some gaskets and swapped on another set of heads i had laying around to get the truck running again while i built another motor, now the debate is 390 or save some extra cash and go 410....
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
the edelbrock is no performance piece. Your truck is heavy, I don't recall getting any rearend gear and tire combo's. I know my truck from 0-20mph at wot is a dog, and thats at 5200lbs. A 8.5cr for a heavy truck and towing is ideal, especially with a smaller camshaft.
AS for secondary springs, i happen to run a light spring even though my truck is kinda heavy. I have the 670 street avenger and it comes with a lighter spring and a stiffer one. They say the stiff one should be used with heavy vehicles and vice versa but as mentioned I like the light one.
As someone said, you should make sure your secondaries are opening all the way. Usually, if your gas pedal is high and has a lot of travel you are fine. But if you are about an inch or so off the floor, i would check that.
Heck you might want to check your timing and make sure the vaccum advance cannister is working.
AS for secondary springs, i happen to run a light spring even though my truck is kinda heavy. I have the 670 street avenger and it comes with a lighter spring and a stiffer one. They say the stiff one should be used with heavy vehicles and vice versa but as mentioned I like the light one.
As someone said, you should make sure your secondaries are opening all the way. Usually, if your gas pedal is high and has a lot of travel you are fine. But if you are about an inch or so off the floor, i would check that.
Heck you might want to check your timing and make sure the vaccum advance cannister is working.
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More Turbo
Joined: Sep 2002
Posts: 513
Likes: 0
From: Alberta
I've got 3.73 gears in it with 285/75 R16 tires. I had 4.11 gears but I the highway speed was too slow for me. My truck pulls off the line pretty good but on the highway if I don't run even a small hill I lose speed. And with a trailer its way worse.