Tang2

I'm running an old set of Thunder Racing/GTP ported 5.7 heads that were machined to accept Comp 987 springs. The cam I have is the TR227 which has an intake lift of .569 and an exhaust lift of .563. I have roughly 16000 miles on them and will replace them this winter. Which valve springs would you recommend? I was thinking of just doing the 918's, but would they work with the heads being machined for the 987's?

Fbodyjunkie06

iTrader: (10)

That spring is a 1.43" OD so it's a good bit larger in OD than a 918, but the 918 will still work with the correct retainer and locator.

A PAC 1218 would also work well and is rated up to .600" lift with appropriate seated and open pressures to use with your current camshaft.

Tang2

Thanks for the advice, I'll give the 1218's a look.