So I have a TC88 with an Andrews 37H and a 4 degree offset, a heavy breather, and a Fat Cat installed now and the heads are going out to get ported and milled down to 78CC to up my compression to 9.54:1, 8.99:1 corrected. I have higher flowing injectors with the corrected angle to install when reassembled but while the heads are off are there any suggestions for other work? Engine has 47K on it and I've thought about just getting the 95CI bore and new pistons done but it just sounds like that stage would just add maybe 7-8% and eat up a lot of gas. It doesn't seem worth the $600 for boring, pistons, and compression releases.

 

Boring to 98" (not 95") is worth the $500-$600. Bore to 98", run CP pistons with 3cc dome, headwork but retain the 85cc chambers, 86 the 4* advance key. Static will be about 10:1 and corrected about 9.35:1; should be a runner with the heavy breather and Fat Cat. If you can't afford to get heads done now, do the 98" top end and have heads cleaned up, compression releases, new guide seals and good valve job and have heads ported when funds are available. You did not mention fuel management; need a good tuner and tune with that setup. If carbed, consider an programmable ignition like DTT TC88. JMHO.......

 

Thanks, djl. I've been wondering about a measurement that is on the compression calculator. They state that the stock 88 and 96 head gasket bore is 3.850 and that the big bores are 3.910. What is this measurement and is it just inherent to boring the cylinder to increase the gasket bore? Is this just the inner diameter of the gasket itself?

 

88 and 96 stock bore diameter is 3.750". Big bore diameter for both is 3.875"; 3.910" is the ID of the bigger bore head gasket.

 

Ide go 98" too

 

I'll triple that suggeston.

 

While you're in there.... let's see...

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Got my quotes for the work and asked about getting a pocket port since they are already doing a valve job and wondering if it is really worth the additional $300 or if I should just wait to save up for a $1000 full CNC and enlarged valve job.

 

lots of very good headwork out there for a hell of a lot less than a grand

 

Actually once bored to 98", with the proper compression, you will traditionally/historically increase fuel economy
Our Stage I Heads, with our 98" piston/boring/complete Cometic gasket set, ring end gaps are set and installed on the pistons is only $1300.00.
Bolt it together and tune/ride/smile.
Scott