The heater hose connection to the intake is made to a formed pipe which is inserted into a hole in the rear of the intake. The pipe on my intake has come loose. There does not appear to be anything mechanically holding the pipe in place. I don't think that pushing the pipe back into the hole will hold since it is quite loose. What approaches have you used for this connection. I was thinking of getting a pipe thread fitting and tapping the hole, but there is not much meat around the hole and I am afraid it will crack. Pictures below.

Rolland

I might be inclined to just clean both mating surfaces thoroughly, and use two-part epoxy or JB weld to hold it in.
If you can expand the pipe just a bit in order to make it a "force fit", it might help. I would still use the adhesive.

I have the same setup, but my pipe appears to not be going anywhere. I did, however, use JB weld to block off the heater hose fitting on the back of the water pump. Then I installed a rubber cap over it. (If yours is an 86 or older, please disregard. You will need that fitting.)

I concur. You are working with cast aluminum. JB Weld will seat that tube securely

Getting off topic a bit; I was always curious whether or not the Allante Intake boosts horsepower and/or shifts the power curve. I should have a 4.9L on the road soon and it would be good to know. Any before or after dyno or road tests available?.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

yes the Allante intake adds some power. The engine breaths better and gets better top end performance. I don't have figures handy to give you though

quote Originally posted by Arns85GT: yes the Allante intake adds some power. The engine breaths better and gets better top end performance. I don't have figures handy to give you though

Well I guess a "seat of the pants" feel is some indication but I was hoping for dyno numbers. Looking at the design it would appear that the long runners will help the bottom end. Adding the Allante upper and lower to a 4.9L is a bit of work and was looking to consider the risk vs reward results

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "