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GT6 Increasing GT6 compression...opinions and advice

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F

Flinkly

Jedi Trainee
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after reading my competition prep manual for the umpteenth time, i'm really starting to think about skimming my block and head to increase my compression ration to at least 9 to 1 (from a supposed 8 to 1). here are the questions for today:

First, i was thinking of going up to 9.25 to 1 since early GT6's seemed to exist nicely at this point for some time. What kind of gas will this require and what are the upsides to going a bit higher or lower?

Second, i am going to skim the block to the level of the pistons, do i need to get a regular GT6 head gasket instead of my recessed bore gasket? and what abuot my change in piston to .02? (new to engine rebuilding!)

third, i want to get some opinions on if this is all worth it. i figure it will be easier now then after i put it all back together and back in the car and the increase in power is always nice. overall, i want a very easygoing street car that can keep up with todays traffic needs. oh, and my only real performance changes is a sports exhaust system with the regular manifold, maybe k&n's in the future too.

oh, and how easy is it to have my block restamped? and general cost of a head and block skim?

thanks for the info guys, you're all a treasure trove of information.
 
Not very sexy, but you might want to give a re-curved distributor with a Pertronix a try first. You can always use it with a rebuilt/enhanced engine anyway, but MUCH cheaper to get started.

I was pleasantly shocked at the difference it made on the TR6.
 
i've already got a redone dizzy with a plate for points and for pertronix. and i'd love to try it out too, but the engine is in the shop waiting for a single valve collar.

<span style='font-size: 8pt'>to tell you the truth, i've never driven a gt6...just don't tell anyone.</span>
 
Ah - I'll have to defer to others on the skimming Q&A. I don't have any experience with that and don't want to offer guesswork.

Good luck!
 
If you have a later O-Ring block then you can take very little from the top without getting into trouble.

Alan T
 
wow.

quite a read Tom, really gives you the meat and potatoes. i love how he adds the gravy right at the end with a suggested list of order, which leads me to cool my jets.

Since i haven't committed to "marrying" this gt6, i think i'm going to zip her up how she came and leave any major work for a little later down the road, enjoying her all the way there.

LET TRIUMPH ENJOYMENT CONTINUE!

<span style='font-size: 8pt'>less downtime and more money for me anyways...</span>
 
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