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  1. the domed pistons was a cost consideration to allow the same head on engines in export markets with low and normal compression ratios saving the head milling expense.
  2. If you are building a 2.0L engine you need a head that is .100' thinner than a 2.5L. I had a 2.0l head on a 2.5 with very bad results. I then changed to a US spec. 2.5 crank and head (so 2.5 displacement) and then needed to remove .100" from the late 2.5 US head to get to 9.2:1 per Richard Good research. https://www.goodparts.com/tech_docs/TR6_Compression_Ratio.html. The narrow port head was an early TR6 head and only TR6 intake manifolds exist which don't accommodate the gt6 low hood. there are GT6 wide port manifolds which can be used on 2.0 and 2.5. I would think a MK3 gt6 head w
  3. https://www.facebook.com/john.maccarone/media_set?set=a.2343643625743904&type=3 Clickable
  4. annual Jag meet. I used the link so all the photos are not up loaded. https://www.facebook.com/john.maccarone/media_set?set=a.2343643625743904&type=3
  5. negative pressure is need in the crank case of any engine in any application. It can be applied to the engine or a catch can connected to the engine.
  6. Valve spring compressors measure rate of pressure. You measure the pressure at the spring's installed height to determine the pressure on the seat with the valve closed and the pressure at full cam lift/max. spring compression to determine force on the cam lobe. if you wish to determine the volume of oil in the sump drain it and fill until the dip stick read full.
  7. sory about the amazon link.https://www.ebay.com/itm/Wilwood-260-2636-Aluminum-Master-Cylinder-5-8-Bore-Girling-Style-Master-/113134987201
  8. https://www.amazon.com/Wilwood-260-2636-Master-Cylinder-Girling/dp/B003XVEFHC/ref=sr_1_1?gclid=CjwKCAjw8e7mBRBsEiwAPVxxiA80ml26DHBuluxjToVMiLRGOEM8LBldrXJIZhLzUObG7HSC-7buhBoCrCcQAvD_BwE&hvadid=253496469582&hvdev=c&hvlocphy=9002229&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=5399091468700986628&hvtargid=kwd-423710107655&hydadcr=5741_9590435&keywords=wilwood+5%2F8+master+cylinder&qid=1557976094&s=gateway&sr=8-1 these are reasonably priced. I have been using one for about 5 years. I also am using there master cylinder on my Amazon. Kits are only availab
  9. "off with its head! " exactly. otherwise it's like trying to sew a button on you shirt while you are wearing
  10. there are several inexpensive tools for removing valve springs on installed heads (plus compressed air to keep the valve seated). Once the valve spring is removed tape on the stem will keep it in place. Once all are remove the seat pressure at installed height and pressure at max lift can be measured.
  11. Nice looking and at a fair price. https://www.facebook.com/groups/2555366852/permalink/10155816737571853/
  12. you need negative pressure in the engine so applying metered manifold vacuum to a baffled catch can with a mesh screen is simple, cheap and effective. It could be made with a coffee tin steel wool and tubing.
  13. if you a happy with a rely box with lights have you considered a a momentary switch to engage a latching circuit that will de-energize the OD circuit if you shift out of 4th gear. The OD will not re-energize with out the momentary switch being reapplied.
  14. I have found that bearing spacers stiffen the hub/spindle connection diminishing pad push back and pedal travel on the first application. An inexpensive fix
  15. If you want to install different wheels to your TR7 determine the space in the rear wheel opening between the inner body and the rear axle flange. Minus a little clearance that is your max back space. The front will have plenty of room. The offset is where the wheel mounting flange is in relation to the rim center. Most modern production wheels are 35 to 45 mm off center. A 7 inch rim is 178 mm. With a center at 89mm plus 43mm offset equals 132mm backspace plus about 12mm for the rim lip. Wheel spacers/ adapters have their own studs and can be a different bolt circle diameter than the axle fl
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