Pepmeier Engine Development
Specializing in 1990 - 1995 Chevrolet LT5 engines
Billet Steel Camshafts
High Strength Fasteners
Cylinder Liners
We can supply new billet steel camshafts, either as semi-finished cores, or fully finished with custom lobe profiles. These are premium 4140 steel and compatible with OE or aftermarket cam followers. Proper heat treatment is critical to durability, and these are proven to last.
Lobe profiles are virtually unlimited, including a selection of existing "off the shelf" designs (some of which have powered very successful endurance and touring car engines). Custom profiles can be tailored to your exact engine and induction system design, for an extra charge. One of our recent projects picked up over 60 horsepower compared to "Stage 3" cams on a full race engine.
We offer several types of high strength steel fasteners for the most stressed areas of the LT5 engine. All studs are made from extremely high quality aerospace steel such as 17-4ph, 13-8ph, and more. As with most motorsport fasteners, both the fine and coarse threads are rolled, and the body is undercut.
We currently have main bearing studs and lower sump perimeter studs for 2-bolt motors which provide significantly more clamping force compared to the OE fasteners. This essentially eliminates main cap "walk" in high speed applications. 4-bolt studs are being developed.
Head studs are also available, made from 13-8ph steel.
We can provide at least three types of cylinder liners for your LT5 build. The LA sleeve ductile iron liner has been the standard for 4.000" bore engines for many years. We are an authorized LA Sleeve dealer.
More exotic sleeves have been designed and sourced for unique requirements. Aluminum, nikasil coated, open-deck sleeves can accomodate a 4.000" finished bore. To ensure adequate liner thickness, the cylinder block must be bored oversize before installation.
For the ultimate large-bore build, we can supply ductile iron "closed-deck" style liners for up to 4.125" finished bore. As with the aluminum liners, block machining is required.