demonpixel

iTrader: (19)

How does an engine shop/machine shop know what specs a pair of heads should have when rebuilding them?

I get that an LS engine shop will be familiar with LS heads, but what if I needed gen I sbc heads rebuilt or late 60s-early 70s pontiac heads rebuilt? i know they rebuild heads from all kinds of performance applications but how do they know how much spring tension each head should have, or what diameter the valve stems need to be? Do they cross reference a database or look this up in a factory book?

i'm embarassed i don't know this but am dying to know

thanks again guys

whytryz28

iTrader: (28)

Experience, books, other people telling them. Heck even reading forums like this. Ive learned what i know from other peoples mistakes, and making them.

jsteele90

iTrader: (13)

xxrillixx

iTrader: (118)

Depends on the quality of the shop.

Id say most places would have a good idea... but just because they machine heads doesnt mean they know anything about the heads they are machining, or what you want out of the project for that matter. Machining a stock ls1 head someone could be doing a stock cam... someone else could be doing a .650 lift and needs dual springs... same head, same car, different application, different springs.

You should do the research and get the spings you want. IMHO

demonpixel

iTrader: (19)

good advice, thanks man. after you get the specs on what you want, i guess you just communicate what you need to the shop, correct?