Frankenstein F710MB F-Series 277cc LS7 CNC Ported 10 Degree Cylinder Head, 65cc Chambers - Medium Bore

Frankenstein's F710 277cc LS7 CNC ported intake and exhaust chambers cylinder head feature our Black Nitride Coated Stainless Steel Intake Valve 2.180″ and Exhaust Valve 1.615″, Titanium Retainers and your choice of Custom PAC Racing .700 Hydraulic Roller Dual Valve Springs or .900 lift solid roller springs available *Only for shaft-style rocker setup. FED F-Series Valve Covers are required 4-bolt standard valve covers will not work!

F-Series is Frankenstein’s master creation for maximum horsepower, designed to endure and thrive in severe performance racing applications. Every detail of the F-Series is configured to achieve a stable, efficient and enduring system that removes limits imposed by traditional racing cylinder heads designs.

Sold as a single head, add 2 to cart for a set of heads.

Note: Select your valve spring type, casting type, head stud size by using the product options! Assembly type must select by using the product options!

*Notice, See Bottom of page for General Recommendations for Frankenstein Cylinder Heads

247cc LS F-Series Cylinder Head Flow Chart
	.200	.300	.400	.500	.600	.700	.800	.900	.1000
Int	157	232	294	348	390	398	405	412	412
Exh	127	172	220	255	274	284	290	291	292

 

Description	Specification
Min. Bore Dia.	4.065"
Intake Port Volume	277cc
Exhaust Port Volume	109cc
Combustion Chamber Volume	65cc
Intake Valves	FED Prime Grade – Black Nitride Coated Stainless 2.180/ 5.655
Exhaust Valves	FED Prime Grade – Black Nitride Coated Stainless 1.615 / 5.675
Valve Springs	Your option of .700 Hyd. Roller springs or .900 Solid Roller Springs.
Rocker Type	OE LS7-Style Rockers or Shaft Mount Rockers
Valve Cover Type	*Requires FED F-Series Valve Covers (see product options)
Retainers	FED 6AL-4V Grade 5 Retainer – LS Dual Spring
Locators	FED Steel Valve Spring Locator (Blk Oxide) .565 guide / .060 thickness
Valve Lock	GM Valve Lock
Valve Seals	Viton High Heat Seal
Guides	FED – F-Series Bronze Valve Guide – LS 2700-502-308-270-E-7-C
Exhaust Gaskets	FED Custom #227(Green), 2-1/8 ID x 2-3/8 OD, High-Temp Silicone O-Ring 1/8 thick
Intake Valve Seat	F-Series Intake Valve Seat – LS – Ductile Iron
Valve Seat	F-Series Exhaust Valve Seat – LS – Ductile Iron
Pushrod	Must measure
Lifters	Johnson Link Bar lifters recommended

General Recommendations for Frankenstein Cylinder Heads:

Pushrods – Please make sure to properly check pushrod length and wall clearance. We recommend a clearance of at least .030” between the pushrod and the wall. Please do not clearance the pushrod holes any further. We have a minimum port thickness required to pass QC and that is set at our facility. Every lifter brand and style use a different pushrod length, so make sure to properly check the length needed for your application.

Surfacing – Flat or angle milling will affect flow numbers and may require a thicker intake gasket. The intake manifold will also need to be corrected to match the intake ports for optimal performance.

Boosted/Nitrous Applications – With any power adder applications comes increased stress and longevity issues for the valvetrain. We highly suggest the use of Inconel exhaust valves in any power adder combos. We also suggest our upgraded valve spring kits to help properly control the valve train in these stressful conditions.

All MARINE Applications – We strongly recommend Inconel exhaust valves & also offer a hard-anodized coating to slow the effects of corrosion. Please see note on guide clearance below.

Valve Guide Clearance – Your FED Heads come with proper guide clearance for most applications. Boosted/Nitrous or marine applications might require additional clearance and it is the customer’s responsibility to verify proper clearance in these applications.

Valve Springs – Forced induction, nitrous oxide and cams with aggressive ramp rates may require additional spring pressure. We offer upgraded valve springs for these types of applications. FED also recommends the use of billet 8620 cam cores and high-quality lifters. VALVE SPRINGS MAY NOT BE COMPATIBLE WITH YOUR CAMSHAFT COMBINATION. PLEASE CHECK BEFORE ENGINE ASSEMBLY. IMPROPER SPRING AND CAMSHAFT COMBO CAN CAUSE SEVERE DAMAGE.

Piston to Valve – FED assumes no responsibility for damage if the end user builds an engine without properly verifying he or she has enough piston to valve clearance (depth and radial clearance both checked). We recommend a minimum depth of .080″ on the intake valve and .100″ on the exhaust with a radial clearance of .030″ minimum around the perimeter of each valve. Just checking depth is not enough, the position of the valve pocket must also be addressed. It is the customers responsibility to verify proper piston to valve clearance.

CNC Porting – Occasionally a 100% CNC ported head might have a very small area left “as cast”, this in no way affects performance.

Valve Spring Installed Heights – FED valve spring installed height spec is +/- .015” which is the smallest shim available for adjustment. This small of a difference will have no issues and should be of no concern.

Stock GM Rocker Arms – GM Rocker Arms are not designed/engineered to endure aggressive aftermarket cams or higher spring pressures/rates. At a minimum FED recommends using CHE Bushing Trunnion Kits. Without the proper parts you will experience accelerated guide wear over an extended period.

O-Rings – O-rings will wear out over time. Removal of components, such as headers for example, may cause O-rings to wear faster. We highly recommend a thorough inspection of any O-rings during removal and prior to installation. Worn or damaged O-rings should be replaced.

Head Stud Sizes- Make sure to get the proper head stud diameter and length for your head and block combo.