# Heads

**URL:** <https://forums.speedlife.net/t/heads/243145>\
**Category:** Shift518 Automotive\
**Created:** [March 29, 2009, 11:15am UTC](https://forums.speedlife.net/t/heads/243145 "2009-03-29T11:15:25Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)\
**Post date:** [March 29, 2009, 6:07pm UTC](https://forums.speedlife.net/t/heads/243145/17 "2009-03-29T18:07:25Z")

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> [@The new Muscle Car Wars begin](https://forums.speedlife.net/t/the-new-muscle-car-wars-begin/16354/21):
>
> I found a good deal on a set of new Canfield heads but Im waiting to find out what size the rocker studs are. Theyre 54cc so the compression will be even higher.
> 
> What happens if I buy heads and a cam and the ptvc isnt right?

Thicker head gasket, and/or flycut/change pistons.

As I recall you want .080 on the intake side and .100 on the exhaust side, min.

A good engine builder can give you a close estimate on your PTV clearance with cam/block/head/etc specs.

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