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CV-1 Specifications

At the beginning of development, the following list of criteria were specified:
 

*Applicable to both factory and aftermarket blocks 
*Use off the shelf valvetrain components
*No shaft rockers required
*No offset lifters
*No pushrod "bulge"
*Use conventional Pontiac cam profiles
*Standard round port exhaust (optional convertible port)
*Retain full complement of accessory bolt holes (even A/C)
*Retain stock water crossover mount location
*Oil drain path options, minimizing windage
*Provision for down nozzles in intake ports
 
Additional features listed in the options table below:

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           Guideplates

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         Moroso #68040

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Convertible exhaust port option

The new Spread Port CV-1 can produce dramatic power increases over the factory head designs with no additional porting required.  Therefore, it is mandatory to include quality components in the short block to handle the increased power. Even better, enlist the services of a reputable performance engine builder for an assembly that can be tailored to your needs.

**Some applications could experience clearance issues with underhood accessories which may require modification**  

The following four options must be specified when ordering a set of CV-1 cylinder heads for your traditional Pontiac powered vehicle. There are no extra charges for options except where noted:

1. Small or large combustion chamber volume- 65cc or 92cc
2. Round port exhaust or *convertible port* (see above) with tapped bosses for custom headers
3. Roller rocker or offset shaft rocker usage. The latter comes with pushrod reliefs minimized for maximum porting(available soon)
4. Water jacketed or *solid dry head*

*Extra charge- see pricing*

When ordering, please specify the answers in writing to these options and fax or email it with your name, business shipping address, method of payment, and daytime phone #.

                                    Parts List

Intake
valves
Manley #11868-8  2.25" dia 11/32" stem 5.49" length- 1.95" spring ht. 
Manley #11878-8  2.30" dia 11/32" stem 5.61" length- 2.07" spring ht.
Exhaust
valves

Manley #11353-8 (Pontiac E-head) 1.66" dia 11/32" stem 5.23" length 1.95"-spring ht.
SI #1600SG 1.73" dia 11/32" stem 5.35" length 2.07"-spring ht.

Pushrods &
guideplates
Hardened, 5/16" or 3/8" dia;  Int 9.45"-9.75" length   Exh 9.60"-9.90" (CV products)
Guideplates available for 5/16" or 3/8" pushrods

Rocker arms
& accessories

BBC rockers that measure **LESS THAN 1.60" OVERALL WIDTH**   STUDS: ARP #135-7101
Rocker shafts: Yella Terra #YT-6317 BBC rockers (16)#YT-6235 bases (16)#YT-6088 bolts
Source: IEPG (601)693-8282 Charlie

Valve covers
& gaskets
Custom valve covers (see home page for contacts)
Moroso #68040,#68041,#68042 & Ford 351C gaskets (slightly modified)

Head gasket
& studs

Any head gaskets (must notch for exhaust pushrods clearance)
ARP 1/2" studs: (8)5.25" (6)5.40" (6) 3.25"  Source: CV products (800) 448 1223

Pistons

Ross Pistons- contact Ian
JE pistons- Outlaw Racing Engines (909)931-4612
BRC pistons- Ken's Speed and Machine (352)796-8800

As cast flow figures on Superflow SF-600 flowbench.  4.15" bore;  2.25" / 1.66" valves.
*Bowl blended only; values may vary on different test equipment*

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Setup

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Results