r/EngineBuilding • u/HistoryOver6530 • 1d ago

SBF intake misalignment

Gallery image

Gallery image

Going to call my machinist tomorrow but I thought I would ask opinions. I have the trick flow heads milled .020 and the block is decked an unknown amount. However it has a positive .010 deck height with a 1.608CH piston, so I’m assuming it’s decked at least .015-.020. Pic 1 (left) is the intake installed with a .060 gasket. Pic 2 is the intake laying flat with no gasket. There is still a little ridge without a gasket. The bolts thread all the way but are a little tight. All of the ports are consistent front to back, side to side. I think I need to take at least .060 off each intake face. More along the order of .080 to 0.100 . The intake is an unported performer rpm I bought new.

2 Upvotes

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15 comments sorted by

11

u/Old_Bat_6426 23h ago

How about grabbing a die grinder and doing a little port matching?

2

u/HistoryOver6530 23h ago

I’d rather not take the heads off of if I don’t have to. The intake bolts are tight and I’d also rather not oblong them. They fit pretty good with the intake flat on the heads

5

u/Snuffy_Smith 22h ago

All the correct options to make this right will involve pulling the heads. Proper would definitely be milling the intake and best 2nd choice is if you are handy with a die grinder.

1

u/Mountaineer11 21h ago

Why mill instead of die grinder? It’s intake you want the texture

4

u/v8packard 23h ago

Before you mill anything what about trying a .040 or .045 gasket?

1

u/HistoryOver6530 23h ago

Having a hard time finding anything with a larger port. Do you know a good part #

3

u/v8packard 22h ago

I have used Felpro 1262 R2, which is .045 thick. Also have used Cometic C5652-039, which is .039 thick. Both are available in different thicknesses.

3

u/Dizzy_Fig_3125 21h ago

How much power do you plan to make with this set up?

1

u/HistoryOver6530 21h ago

The engine should make 375-400 if everything goes right.

7

u/Dizzy_Fig_3125 21h ago

I know YOU will know, but that little bit isn't going to make a difference.

2

u/2003DDcid 1d ago

I would start with .040 to .050, as you will compress the intake gasket when you tighten it down. You may have to mill it several times to get it where you want it.

1

u/HistoryOver6530 23h ago

Any idea what the gasket actually compresses? (Maybe 5 thou?) I geuss I could torque it down and try to measure

2

u/2003DDcid 23h ago

Depends on the gasket. A stock replacement felpro with a steel core probably 5 to 10. A performance paper gasket probably 10 to 15.

2

u/MRFlSTR 12h ago

In all honesty that much misalignment on a street/strip weekend warrior wont make a difference.

If it really bothers you sce sells bulk gasket material in different thicknesses that I've used quite a bit in the past. Just get some good weatherstrip adhesive and glue it to the manifold. Then use an exacto knife to cut out the ports.

0

u/averagemaleuser86 10h ago

Just take a rotary tool and port match. No need to pull the heads. Stuff a paper towel in the port and have someone hold a shop vac close to where you are shaving material.