I rebuilt a 5.0 and put on a set of AFR 165 heads for my 76. The block was 0 decked at the machine shop. Due to core shift when the block was cast, the machinist had to 0 deck it to get the block squared up. The bulk of the material was removed from one bank of the block. Now I am having issues getting the Explorer lower intake to seal the ports correctly. From what I have been able to google, having the block 0 decked shouldnt require having the intake milled. Does that sound correct? So far, I have had the intake off 3 or 4 times. Are there any tricks to getting these lower intakes to seal correctly? Do I need to get my intake machined due to the block being 0 decked?
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Intake Sealing Issue
- Thread starter Knuck
- Start date
Broncobowsher
Total hack
- Joined
- Jun 4, 2002
- Messages
- 37,076
I think you answered your own question. There was instructions in an old Ford Motorsports catalog that gave the math of how much intake needed to be milled based on how much was cut off the block/heads.
With no gasket, just set the raw lower intake on the heads, how does it look? Nice part about the Explorer lower is you can look down the ports and see the alignment pretty good.
Next up is the aftermarket heads with big ports. That has been known to cause sealing issues with some gaskets. I want to say the FelPro 1250 is bad and the fix is the 1250S, being a steel core added. But there might be other issues as well.
With no gasket, just set the raw lower intake on the heads, how does it look? Nice part about the Explorer lower is you can look down the ports and see the alignment pretty good.
Next up is the aftermarket heads with big ports. That has been known to cause sealing issues with some gaskets. I want to say the FelPro 1250 is bad and the fix is the 1250S, being a steel core added. But there might be other issues as well.
The AFR 165 heads dont have huge intake runners, so thats good. I am going to pull the intake this week and spend some time with feeler gauges, and a bore scope to see whats up. Also going to build a smoke machine to try and isolate the leak. I have read the 1262 s3 gaskets are good, so plan to try those. The 1262 R series are also good, and come in different thicknesses, so those are an option as well. I just want this dang thing sealed up once and for all so the guy I hired to tune it can work his magic. Tired of not being able to drive it. I think this vacuum leak in the intake is the last problem to solve (Famous last words) before he can do his thing.
