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461-474 cu in Engine Builder Package / TEP w/RA 4.150-4.211" Bore / Ross Forged Piston / 4.250" str.

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Part # BPI-4250RA-TEP

Cast or Forged 4.250" Stroke 4.150-4.211 Bore Rotating Assembly
with Edelbrock RPM Heads (D Port or Rd Port Exhaust)
Comp Cam and Hyd Roller Top End Package
Kit for use with your block
BLOCK NOT INCLUDED

Availability: Ships in 2-3 weeks or sooner

Description

This Top End/Rotating Assembly Kit is designed for use with your block and a local shop to machine it for you. Butler Performance will gladly provide our recommendation of clearances and help with any other tech questions you or your machinist may have. This kit takes out all the guess work to create strong, streetable Pontiac engine running on today's pump gas.

Compression Ratio : Pump Gas (91-93 octane) 10.2-10.4 : 1 included

Cast or Forged 4.250 Str Crank

Forged Ross Custom Pistons 4.150 to 4.211 Bore

Choose Your Rods

Total Seal Rings

Clevite Bearings

Internally Balanced in our shop

Butler Custom Hyd Roller Top End Kit

Edelbrock RPM Heads- Choose Round or D-Port

**Edelbrock Performer RPM Intake port matched to chosen heads ($195 value)

Comp Custom Grind Cam

Hyd Roller Lifters

Billet Roller Timing Set

Cam Options

Choose Idle Quality/HP Level and we will spec and select the appropriate cam

Fasteners & Gaskets

ARP Pontiac Head Bolt Kit

Intake Manifold Bolt Kit

5/16" Cork/Rubber Valve Cover Gaskets

D-Port Reinforced Exhaust Gaskets

Pontiac Fel-Pro Standard Intake Gasket / Includes Heat X-Over Block Off

B.P.’s exclusive head gaskets, same as used in Butler Performance engines

Pushrods & Pushrod Checker

We include a pushrod length checking tool in each kit for measuring proper pushrod length. Because brands of lifters and rockers require different pushrod length.

Rockers

We offer (not included) many style rockers to choose from. Rockers that will work for these kits include stainless steel or aluminum from brands such as Comp, Scorpion, PRW, Crower, and more.

We recommend 1.5 ratio rockers so that pushrod slotting is not necessary.

** Performer RPM intake is1" Taller than stock. Trans Am shaker cars need a drop base such as the EP-401. Ram Air cars can have us swap to a stock height Performer or Hurricane intake. Just add the change request to the order notes in checkout.

This kit is for your block being machined by your shop or see our builder kits using your block and us do the machining

Compression Calculator

Simply fill in the form below to calculate your compression ratio

*BP Flat Top pistons normally include +8cc valve pockets. When selecting dish piston from list, do not add valve pocket cc volume. Valve pocket cc is already included in the dish piston volume*

Bore: (diameter)
Stroke:
Cylinder Head Volume:
Effective Dome Volume: ^{Use (-) for Dome and (+) for Dish.}
Deck Clearance:
Compressed Gasket Thickness:
Number of Cylinders:
Compression Ratio :
Total Displacement (in.³) :
Total Displacement cc's :