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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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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
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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.
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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.
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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
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Rocker arms & accessories
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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
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Custom valve covers (see home page for contacts)
Moroso #68040,#68041,#68042 & Ford 351C gaskets (slightly modified)
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Head gasket
& studs
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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
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Pistons
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Ross Pistons- contact Ian
JE pistons- Outlaw Racing Engines (909)931-4612
BRC pistons- Ken's Speed and Machine (352)796-8800
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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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