Technical 392 Hemi Blower Intake Questions

I have a 1958 392 and have a line on a blower intake for it. i alreasy have a rebuilt blower, but will need a drive etx.

My questions are as follows:

1. Will this blower intake have any clearanee issues with drives or distributors that are readily available?

2. Would this be good for a street motor or opt for a new Hot Heads intake which may have improvements, better design than this?

3. Where can I source springs for the blow off/bypass/relief valve?

Thanks in advance

 

The blower intake should clear most any distributor or magneto without issue. The hotheads intake is no doubt a better design, but likely not enough to be noticable unless you plan on racing. The Mickey Thompson intake has a much better look if your trying to keep a period correct look. Dyers blowers in Summit IL should be able to suply any parts your missing.

 

I do like this for the early look

 

Everyone of the original intakes has a different height and some have a different blower location. If you bolt the intake on the engine and a pulley on the crank and use a straightedge vertically, you can get the dimension of which drive you will need. When it comes time for belt length, you will need center to center plus the number of pulley teeth to get the correct belt. I'm referring to Gilmer belts. If you're doing v belts, it's a different story.

 

I don't have any constructive input. However, that is bad ass.

 

Any idea where to come up with springs for the pressure relief plate?

Also do such plates use a gasket?

 

The springs on my Weiand SBC manifold look like springs used on tooling for punch press dies. I’ll try and get some measurements later.
Yes, there is a gasket, not paper thin, it has some body to it. On a street car with occasional blasts through the gears the blow off probably will never come into play but when starting a cold engine give the throttle a couple of good pumps to prevent backfire. The manifold plenum is relatively large and needs the extra fuel.

 

Technically I would opt for the carb setup. There is a lot more to going with a blower than just bolting it on if the drive and dizzy fit. I would encourage you to learn about adding boost to a motor before going that route.

 

To configure the spring requirements, you can do the following: Measure the area of the blow off hole. Calculate the square inches of area from that. Decide how much pressure you want to open the valve such as 12psi. Assuming you are going to run no more than 7psi. Multiply the square inches of area by the desired relief pressure. Then divide that by 2. That will give you the desired spring seat pressure for each spring. Start looking at valve springs until you find something appropriate and find a retainer to modify for the correct fastener diameter through the keeper location. That's what I have done on every manifold I have purchased before burst panels became mandatory. Bear in mind that if you have a 20psi max boost you will need to add at least 10% to that number for any protection. A backfire can put upwards of 100psi in the manifold. That is what will bend the rotors and be the end of your blower.

 

Intake is on the way to me now.I have a brand new 8v71 pinned etc for gas car, I need to get the adapter plate asthe 8v71 I have is rhe one with angled bolts. I need to see what type of clearance I will have from plate to top of intake bolt heads, may need button / pan allen bolts.

Any idea what length intake bolts this would have originally? maybe someone has an M/T catalog or knows specs. Guessing a couple length bolts.

Thanks all!