thinking about upgrading my 88 to 95. want to run andrews 37 they say they should run 9.7 - 9.8.1 compression. would wiseco domed pistons fit with the stock heads. that would bring it up to 9.5.1 then use 030 gasket should get me close to the compression i want. the bike is a 06 streetglide

 

Depends on the dome volume and the chamber volume. Best to CC the head and use a compression calculator to figure out what you need to do. Most TC heads will run 85-86cc but I have seen them measure 89-90cc. Using domes and maintaining chamber volume is a better approach to set compression than using flat top pistons and cutting .060".

 

From what I here its best to run flat tops pistons.. I would send ur jugs to to big Boyz and have them bored out for 150$ new pistons 200$ and have him port the heads 300$ and for 70$ he decks the heads and u can set settle compression anywhere u want. The hole job would run u around 700$

 

We have a good client in Worcester, that we set up with a 37 last year.
Our Stage II Heads/10.0 cr/98"/51 HPI/Bassani 2 into 1/tuned at a shop in Manchester, NH.........108/112, sae.
Andrews wants to see the dyno report........I need to get that over to them sometime.
Scott

 

Using flat top pistons is one way to get there but requires that chamber volume to be reduced to 76cc; a .050" cut on the heads, to set CR at 10:1 per Scott's example in his post. That deep a cut can make intake manifold alignment difficult as well as render the heads useless in the future for a different cam set. Working the heads and ending up with say an 88cc-90cc chamber and a domed piston does not affect intake manifold alignment and makes the heads useable in the future with different cam sets which also makes that heads more attractive to a future buyer as he will not be limited in cam choices.

 

i just build mine i go with andrews 57 same as 37 more lift 10 to 1 comp
ported head 1.9 intake valve stock exhaust valve 98 ci supertrapp 2 in 1 20 disc closed end cap ist ignition ( carb bike ) not break yet but amasing change in power from 88 with 26 cam

 

Want more lift?
We, at this time are setting up a 98"er, once again for a client from Mass.
Wood 408/ 10.6 cr/roller rockers/98"/our Stage III Super-Tour Heads/55 mm HPI.
Crank is pinned, and welded.
Gonna' be a beast.
Scott

 

use 22851-99A SE pistons (9.4-1),then mill the head .027,as long as the head was 85cc`s to begin with,this should put you right in the 9.8-1 area (DONT do any machining without cc`ing heads first)