906 Head shop
On 9/21/11 we tried these same heads on a 500ci motor and ended up with a train wreck.
On Comp Cams dyno, somehow, the water never got turned into the engine. At about three minutes into the ring break-in, she made some really strange noises. The exhaust valves stuck to the bronze guides and the guides were moving up and down with the valves, 15 of 16 valves were out of round, one bent pushrod and ruined adjuster.
Pulled the heads, knocked out the valves and guides, knurled the guides and punched them back in. Reamed the guides and reinstalled the valves. Replaced the pushrod and adjuster. Without retouching the heads or valves seats and with leakdown percentages past the rings, intake and exhaust valves, at 7%, 10%, 10%, 10%, 23%, 30%, 32%, 56%, it made 730 HP on 93 Octane.
On 9/21/11 we tried these same heads on a 500ci motor and ended up with a train wreck.
On Comp Cams dyno, somehow, the water never got turned into the engine. At about three minutes into the ring break-in, she made some really strange noises. The exhaust valves stuck to the bronze guides and the guides were moving up and down with the valves, 15 of 16 valves were out of round, one bent pushrod and ruined adjuster.
Pulled the heads, knocked out the valves and guides, knurled the guides and punched them back in. Reamed the guides and reinstalled the valves. Replaced the pushrod and adjuster. Without retouching the heads or valves seats and with leakdown percentages past the rings, intake and exhaust valves, at 7%, 10%, 10%, 10%, 23%, 30%, 32%, 56%, it made 730 HP on 93 Octane.