Don Terrill’s Speed-Talk

Ditto on the 2 7/16... Call Don at Hilborn... He'll be more than happy to answer your questions.

Tom

I have purchased several sets of 227 heads, and the one time I did call to question an issue it was resolved immediately and beyond expectations. Thanks Tony =D> . In a testament of the longevity of their product... the first set was purchased in 2002 race ready 227's, 64cc chambers and the pacaloy ...

Thanks Joe!

I learn so much from this site. Not many places to go to get so many educated and practiced point of views.


Tom

You Can Count Me In!

Tom

Hello Everyone, Been thinking again... :lol: Yep, I still do that every once in awhile... In the past I have always used the same valve spring on the intake and exhaust valves, shimming them to have the same seat pressure dictated by the intake valve seat pressure after getting the open height to ab...

Using the 1.55 diameter springs installed at 1.950 subtracting the lashed lift of .730 brings the open height to 1.220 coil bind for the pac springs is 1.153 leaves 0.067 before coil bind. Is this close enough to keep the spring under control or do I need to shim to bring it closer? Using the nextek...

Wish my pockets were deep enough right now for the ti valves... I do have a jug that I store the cash for my racing parts fund... but it currently looks very copper in color instead of silver and green...

Maybe in next years budget!

Thanks,
Tom

Jon, Thanks for the reply... Helped me feel more comfortable with staying with springs at the smaller diameter (pacaloy) rather than whiching to the larger diameter (nextek) springs. The seat and open pressures were almost identical as was the spring rates 647 larger vs 644 smaller. This will give m...

Thanks for the quick reply! The Nextek Drag Springs is what peaked my curiousity. For drag racing a naturally aspirated sbc running on methanol the advantage would go to the smaller diameter spring for a high rpm motor. Just didn't know how or if the different diameter springs might effect or be eff...

Hello Everyone,
New to the board... Love the wealth of knowledge here...

I was looking for new springs and was curious... Is there any advantage to running a larger diameter (1.55" vs 1.64") valve spring? Assume Open & Seat Pressures are the same with the same spring rates. Thanks!