GESSLER HEAD PORTING, Quadrajet and Buick Parts - hide Shootout Intakes - Buick Nailhead 401-425 Buick Performance Parts / Q-Jet parts

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SHOOTOUT INTAKE MANIFOLDS
Buick Nailhead 401-425

Here are a few pictures to show a little of what goes into our Shootout Intake Manifolds.

Stock dual quad intake.

GHP Shootout Intake Manifold

Modified plenum area, promotes greater airflow. Divider wall can be reduced to help increase top end breathing and tailored to reduce lower RPM torque for specific traction limited applications. This particular manifold was going on a street car that was best served with the full divider wall left intact.

Nailhead Q-Jet
Intake Manifold Comparison
Flow Bench results

*CYLINDER*	1	2	3	4	5	6	7	8	*Average* *CFM*	*% of* *Balance*

Stock CFM @ 28"	221	206	208	218	255	224	235	273	230	-32.5%

Ported CFM @ 28"	252	256	255	255	257	257	245	273	256	-11.4%

Increase in CFM @ 28"	31	50	47	37	2	33	10	0.0	26
Percent of Increase	14%	24%	23%	17%	0%	15%	4%	0.0%	11.3%

Overall airflow increased more than 11%.
Percent of balance from worst to best cylinder was improved dramatically.
Stock external appearance maintained.