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Old 06-18-2008, 10:41 PM
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Question on F-BIRD'88 Build

Okay, I am in a bind with my sbc 350 build, and I am finding myself in need of some info:

1. I understand that the top piston ring on my flat top Hypereutectic Pistons need to be gapped a bit more than standard rings. What I do not know is how much that should be.

2. When I was painting the block, I managed to get some over-spray into the bores, can I wet sand this stuff out & clean it up with something like 280 grit before assembly?

3. Would it be a good idea to remove any paint on the cam cover & oil pan gasket surfaces as well?

4. The Vortec heads have been shaved .045 and now the volume cc's out to 60cc. Can I still use the Felpro .015 steel shim gasket? I installed a lift rules Isky cam, Intake duration: 278 deg. Exhaust duration: 278 deg.

5. Along what lines should I be considering for timing now? I have an HEI and I would like some suggestions as far as total advance. How fast should total advance come on? Would one of those toggle switches come in handy to allow the motor to spin a few revs before giving it the spark?

6. any suggestions on the Plugs I should be using? Heat range?

Thanks fellas, I am wanting to get the pistons & rods installed soon.

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Old 06-18-2008, 11:05 PM
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Quote:
Originally Posted by DENCOUCH
Okay, I am in a bind with my sbc 350 build, and I am finding myself in need of some info:

1. I understand that the top piston ring on my flat top Hypereutectic Pistons need to be gapped a bit more than standard rings. What I do not know is how much that should be.

2. When I was painting the block, I managed to get some over-spray into the bores, can I wet sand this stuff out & clean it up with something like 280 grit before assembly?

3. Would it be a good idea to remove any paint on the cam cover & oil pan gasket surfaces as well?

4. The Vortec heads have been shaved .045 and now the volume cc's out to 60cc. Can I still use the Felpro .015 steel shim gasket? I installed a lift rules Isky cam, Intake duration: 278 deg. Exhaust duration: 278 deg.

5. Along what lines should I be considering for timing now? I have an HEI and I would like some suggestions as far as total advance. How fast should total advance come on? Would one of those toggle switches come in handy to allow the motor to spin a few revs before giving it the spark?

6. any suggestions on the Plugs I should be using? Heat range?

Thanks fellas, I am wanting to get the pistons & rods installed soon.
#1: Info should come with the piston, rings
#2: Yes in a cross hatch pattern.
#3: Yes, no paint on gasket or seal suface
#4: Yes if Deck height isn't to low. Try .040-.045"
#5: Timing all in by 3000rpm. Total Timing 34*,Toggle=Yes,
#6: ?? Not sure.

Last edited by SSedan64; 06-18-2008 at 11:16 PM. Reason: spelling
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Old 06-19-2008, 02:27 AM
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The 280 emery is way too rough to be using on cylinder walls, scotch-brite is a much better choice, just lacquer thinner is the easiest way.
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Old 06-19-2008, 04:46 AM
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Quote:
Originally Posted by ericnova72
The 280 emery is way too rough to be using on cylinder walls, scotch-brite is a much better choice, just lacquer thinner is the easiest way.
Yes to lacquer thinner,no to sand paper of any kind.
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Old 06-19-2008, 06:44 AM
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yea... using 280 grit sandpaper just throws your machine work out the window. Just use laquer thinner.
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Old 06-19-2008, 03:14 PM
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The cam needs minimum of 24deg BTDC base timing at idle and 32 to 36deg max mechanial advance at3000rpm. This requires that you shorten the mechanical advance curve travel in the distributor from 20-24deg stock to around 10-12deg of travel. (limit the amount of mechanical advance travel.)
To get the motor up and running until you can properly modify the distributor advance curve, you can simply lock out the mechanical advance by binding it with electrical tie wraps and set the locked timing at 32 -34deg BTDC.
This will allow you to get it up and running and broken in properly.

The distributor curve should be 24 deg at idle 32-36deg at max advance ( (maxing out around 3000rpm)
+12 to 15deg of vacuum advance at high cruise. (Ported vacuum)
Use a Champion RS10YC or RS12YC spark plug (.708" reach for vortec heads)
You'll need about a 4.5" holley power valve for an automatic trans car.
Needs a high stall converter. 2800 minimum, 3500stall for best performance.
You want to degree this cam in and verify it is installed 4 deg advanced from straight up, (106 LSA) on a 102 degree installed intake C/L. for the street. Gives it a lot of snap.
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Old 06-19-2008, 05:40 PM
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Thanks guys.

Thanks for the particulars. The torque converter is on order from Jegs,
Jegs torque converter

I picked up the rings today.

My weekend is planned, thanks!

Last edited by DENCOUCH; 06-19-2008 at 05:41 PM. Reason: added link
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Old 06-19-2008, 05:45 PM
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Unless you are using KB or Silvolite hypereutectic pistons, you do NOT need additional ring end gap.

tom
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