I tig'd one out of aluminum for my ford 351c.... like ya say, use a gasket as a template and away ya go...

Mine is around 2" high, but i want as much mid range torque as poss,and with the combination of my 509*/509* cam and the predator carb is sweet...

the predator was really crappy without the spacer, wasnt getting much
fuel vapor, more like i was turnin a frickin tap on.....riser has given the turb's i needed and is a good low cost tuning mod..

Hey Tech.. what gains do ya get running inlet risers and spacers together??