MLS "thin" v. FelPro head gasket; gains worth $? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 04-20-2007, 03:48 PM   #11
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Quote:
Originally Posted by agrazela
(Current plan is stock lifters and pushrods, stock valves and locks, viton valveseals, and no change to valveguides unless they need replacing due to scoring and/or slop, in which case I was going to go with stock valveguide replacements)
Sounds good.

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Originally Posted by agrazela
What advantage over a "standard" valve-job (or even a plain-Jane home-lap job, if the seats are good enough for it?)
Would a 3-angle valveseat job require the valves to be re-ground, also? Expected cost?
A 3-angle is a pretty basic valve job. Race heads will come with 5, 9, or full radiused. The higher of cuts will wear down faster. Valve jobs are a huge part of flow numbers for heads. So, if your looking for flow, a valve job will definitely help. IIRC, the valves get cut to match the heads.

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Originally Posted by agrazela
Milling 0.020" wouldn't change spring install height / seat pressure, right? And the stock lifters and pushrods can absorb that difference, right? What about the 3-angle valve seat job...what will that do to spring install height?
The lifters should compensate up to 0.020" and are self adjusting. Your next option pushrod length wise is 7" (from 7.05") so instead of being 0.020" away from stock, you would be 0.030" away from stock.
Valve jobs do raise the spring install height slightly. I know ZZP compensates for this with thier heads. Possibly with a shim?

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Originally Posted by agrazela
Am I asking too many questions?
No way. These are really good ones.

I'm not really sure about the pricing. As Ben mentioned, it would probably be best to give a shop a call.
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Old 04-20-2007, 09:13 PM   #12
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if you plan on running 12+lbs of boost on your DD either gaskets are fine (if the MLS seal, and 1 out of 5 don't due to instal error). However either way you go the studs are very helpful in keeping the Felpros from blowing out. Stock TTY bolts suck under boost..for the $40 more you get 10x the reliability.
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