We do not stock this item.
All Air Flow Research cylinder heads are built-to-order and will take 3-6 weeks, or more, for delivery. Thank you.
Attn: CALIFORNIA RESIDENTS; ALL SHIPMENTS GOING TO CALIFORNIA, MUST PAY CA STATE & LOCAL SALES TAX ON THIS ITEM.
Air Flow Research 245cc LSX Mongoose Strip Aluminum Cylinder Heads
PN 1690
AFR's Max Effort Cathedral Port Offering
These heads are covered by AFR's Limited Lifetime Warranty! see details below
A tremendous amount of time and energy was invested to bring you our
245cc LS1/LS2/LS6 Gen III cylinder head. It represents the pinnacle in bolt on cathedral
port performance. With over 355 CFM available it has intake
flow numbers approaching GM's famed (and much larger) LS7 head with
much stronger exhaust flow in comparison. This head is our take no
prisoners LSX cathedral shaped offering and its focus is large
displacement combination's (415 - 454 CID) with a minimum bore size of
4.000". It requires a head gasket bore of 4.200 or larger and comes
standard with lightweight 2.160 intake valves / 1.600 exhaust.
Another unique feature of this head is that it is “solid roller
friendly” having been designed and machined to accept larger .375
pushrods without additional clearancing (in most applications) and comes
direct from the factory with 1.570 spring pockets (Note: Under no
condition can these pockets be machined deeper). With an aggressive
set-up this head is capable of producing power in the 700 HP range while
still providing gobs of low and midrange torque. It is still a factory
direct bolt on with standard length valves, stock valve train geometry, and everything
in their respective OEM locations. It comes standard with AFR's trademark 3/4” head deck and the same rugged
castings found in the rest of the AFR LSX line up. Make sure you’re
packing lots of displacement to fully realize the benefits this head can
offer you and hang on when its time to go WOT!
Fully-Assembled, complete pair of cylinder heads including:
·245cc CNC-ported AFR LSX aluminum heads
·72cc combustion chambers (64cc chambers also available, PN 1680)
·1.270"-dia hydraulic roller valve springs std. (AFR spring #8019; 155lbs. on seat, 410lbs. open, .650" max lift)
·7-degree 1.250" Titanium retainers std.
·7-degree Bead-Locks & Viton seals
·Spring cups
·Extra thick deck surfaces to resist warpage
Notes:
Designed for use on 4.000" or larger bore engines
REQUIRES 4.200" bore cylinder head gasket, or larger (AFR #6845 gasket recommended)
245cc Large Bore LSX Aluminum Cylinder Head Flow Chart
Tested on 4.155" bore
This is just a partial listing. We also offer heads many more heads to work on all engines. Any head combo can be custom-tailored to fit your needs. From mild-to-wild, we can put together a package to make your ride scream!
No-interest 3- or 6-month Layaway plan available
Terms: Minimum 20% down payment due at close of
sale. The remaining balance will be divided into 2 equal payments for the
3-month plan, or 5 equal payments for the 6-month plan. Payments are due each
month thereafter. Item will be ordered and/or shipped after full payment has
been received. All Deposit and Layaway payments are non-refundable.
We offer UPS Ground shipping to the 48 states. AK, HI, and P.R. shipping extra.
Feel free to call for more info or to customize your kit accordingly.
International Shipping may be available for extra cost.
Please provide a shipping address for quote.
Hardcore Horsepower, LLC
Franklin, TN
615/595-0060
10am-6pm Monday thru Friday
USA Central Time
Check out all of the other great deals available
in our eBay Store!!!
We Make It Go Fast!!!
Note:
Hydraulic roller cams in "LS" Gen III engines typically experience valve float at 6600-6800 RPM's. If you are using aftermarket rocker arms valve float will become prominent and AFR highly recommends upgrading to our #8019 spring. If you plan on running over .600 gross valve lift and/or 6600 RPM, AFR suggests you upgrade your springs to AFR part #8019. Our upgrade spring has higher seat and open pressures (155/410+) to better reduce the risk of valve float in more aggressive applications.
FYI:
LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.
LSX Cylinder Head Footnotes
General special parts/requirements
As with all aftermarket heads, a different length pushrod might be required.
As with all aftermarket heads, your factory self aligning rockers might no longer provide the reliability required.
Due to many available factory OEM style/variations your existing stud girdle may not fit.
As with all aftermarket heads with 1.550 O.D. springs, head bolt, or studs with smaller diameter head might be required for easier installation. As with all aftermarket SB Chevy or Ford heads with 1.625 O.D. springs might require the spring to be removed to install the head.
Valve Springs: AFR springs that come standard with our assembled packages are very high quality and are sufficient for most applications. However, forced induction applications and cams with aggressive ramp rates (some cam manufacturers now offer much faster ramp designs and more aggressive cam profiles) may require additional spring pressure. We offer optional valve springs for these types of applications. AFR also recommends the use of billet cam cores which tolerate higher spring loads. Please don't hesitate to contact us directly if you question which spring is more ideally suited to your application.
AFR assumes no responsibility for damage if the end user builds an engine without properly verifying he 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 .200 minimum around the perimeter of each valve. Clay is recommended to visually verify both depth as well as radial clearance. Just checking depth is not enough...the position of the valve pocket must also be addressed.
See below what factory OEM head AFR used for CAD/CAM modeling.
Please see footnotes and the specific product page your researching for specific variances from OEM heads.
AFR LS1
Was modeled after the GM LS6 #243 aluminum cylinder head.
AFR LS1 cylinder heads do not have provisions for 1997-1998 perimeter bolt valve covers, conversion kits available.
These heads are covered by AFR's Limited Lifetime Warranty! see details below
AFR's Limited Lifetime Warranty!
AFR warranties the aluminum cylinder head casting for the
lifetime to the original purchaser with proof of purchase. Additionally,
valves, guides, valve seats, valve springs, valve job, retainers,
locks, studs, guide plates, valve seals are warranted for two years to
the original purchaser with proof of purchase. All returns must have a
RMA number in order to be returned, call for a RMA number. Parts must be
returned prepaid freight by the original purchaser. When it has been
determined, by AFR at its sole discretion, that the product does indeed
have a warrantable problem from workmanship, materials or an
undetermined cause (mystery failure) AFR will repair at no charge and
reimburse UPS ground freight and return UPS ground freight. AFR will
repair or replace the casting at its option. This warranty doesn’t cover
fitness for purpose and/or merchantability on any product sold by AFR.
This warranty does not cover the following:
Failure due to improper installation or maintenance, abuse,
misuse, unauthorized repairs, modifications, or alterations determined
at the sole discretion of AFR. If your machine shop, engine builder or
installer performs any unauthorized repairs, AFR warranty is voided and
AFR will not reimburse any cost you incurred.
