hard brake pedal after HCI

[88mouse]

Swap a different motor in to my car last week. Now the brake pedal is hard after the first time I hit them. Is this normal? I didn't have this problem with the 347 last year.

New set up is stock bottem end with TFS 1 cam ,1.6RR, tri state al heads 170cc intake runners, and pro products intake.

 

[5.0Droptop]

no its not normal. I would think you have a vacume issue.

 

[Foxfan88]

make sure your brake boost is getting vacuum. sounds like a vac issues to me. spray carb cleaner around and see if you can find a leak. after working on or swapping a motor its pretty easy to overlook something simple.

with that cam you should pull more than enough vac to operate the brakes properly.

good luck.

 

[88mouse]

Got the car in the shop this morning. At idle it only has 4inch's vac. and 13inch's at 1500rpm. I double checked all the vac. line. Car only has power brakes, one for fuel pressure regulator, heater controls and pcv. I sprayed starting fluid at all the intake gaskets nothing changed. Idles at about 800rpm.

This motor had a holley systemax on it before and didn't have this problem. I'm going to check it out a little more after work.