Recent content by RMBuilder

Ted, Here is our card on the HP 500. Bob

Fixxxer, Rollmaster makes a billet, double row Gen VI timing set for STD. . .002”/.004”/.006” line hone applications. They will fit under the 6 and 10 bolt covers. What sets them apart is the Iwis chain, which is undoubtedly the best in the industry. Bob

Fixxxer, The lifters are the Lunati “street roller” lifters manufactured by Morel. The primary use for these is as an OEM replacement. It is hard to assess from these photos, however the scuffing in the skirt area would tend to suggest improper lifter/bore clearance. We do not recommend these...

Scott, Rene and I extend our deepest sympathies to your entire family in this difficult time. Regards, Bob & Rene Madara

42JOHNNY The standard bore size for the newer GM 502 is 4.466”, some previous Gen blocks delivered @ 4.468”. If (big if) you have the SRP OEM replacement pistons for the 502 they would be part # 281916. The .002” over on the SRP pistons would accommodate the hone, while keeping the piston to...

BradB, If the camshaft is the 420 OEM product, it would be a Crane 132561. The 951432 is likely the serial number and CMC designates the core supplier, Camshaft Machine Company. Mercury never put cam supplier or grind numbers on their cams for obvious reasons. The cam can be replicated...

Ted, Donation sent, keep up the good work for a great cause. Bob

SM, The issues that plagued the Mercury were isolated to the (99896-16) HP500 spring. Back in the late 90’s, early 2000’s, there was a batch problem with specific spring wire (used in the 99896 spring) that suffered from improper heat treat. Because there are only three companies in Kobe that...

Cylinder head cc Combustion chamber

Cam Follower "Finger follower" pushrod actuation

Cylinder Head Cylinder Head

Valve Train 2 Valve Train 2

Valve Train Valve Train

Chuck, That engine was a work of art. Let me see if I get the photo posting correct. Bob

Good example of, + 16º/11º additional duration, + .128"/.108" lift, and some boost does for the same engine. Bob