Hi.Well i have a 1967 Pontiac gto, 400So it is not stock.i have a dif intake.carbs.valves and other camshaft and other pistons and everything.BUT.the valve springs are the same then the ones that were in there.original.they were kinda old.so i orderd the crane cam double valve spring.so will the diference be noticble? will i feel any diference?These vere old ones and were kinda easy to move.and these are harder ones.o and if anybody know.what cam would be good for that car? it now has the edelbrock performance plus.its like stock.so any suggestion?
Let's not talk about performance at this momentLet's talk about compatibility of partsYou need to figure out what kind of camshaft and the actual camshaft liftThe way to do that is to call camshaft manufacturer as long you know the camshaft part If you don't then remove the camshaft, you will find couple numbers etched on the ends of camshaftYou just cannot install different valve springs and hope for the best, you need to know spring install height and pressure otherwise You will definitely wiped out your camshaft and damage your valve trainNow for performance, if the motor runs good in all RPMs, then installing different springs will not give you any noticeable performance gainBottom line, I doubt you have original 1967 valve springsThat doesn't sound rightAftermarket valve springs can look like original 1967 valve springs, the only way to tell correctly is to remove the spring and test them at proper install height and pressure Answer to you last questionWhat are you looking for? performance, fuel economy or racing? We need more information on your end before we figure out what type of camshaft is suitable for your car otherwise a wrong camshaft can easily ruined your engine.
Polystyrene is a good insulater, but there are different densities, i don't know which you have, any way the best insulation is product called kingspan, it comes in 8X4 sheets and you cut it to fit tightly between your roof trusses, you will have to strip the plaster board off to do this, building regulations dictate that there must be a flow of air around your roof trusses, therefore you cant use rockwool or a pumped insulation, you must use a solid insulation fitted in such away that it does not fit close to the roof tilesGood Luck
I agree, put the insulation in firstWe often install air conditioners and any one who goes in the roof afterwards tramples on our ducting and accidentally kicks pipes (electricians, insulation installers etc.)It is easier for the air conditioning guys to work around the insulation than the other way around.
if your attic has enough room install the a/c first The recommended attic insulation of R-38 depending on the brand will be from 13 to 16 of blown fiberglass and will be trampled quite easily by anyone in the attic doing workMuch easier to avoid, and step over ducting,then swim through the insulationAll new construction homes have the hvac system in place prior to the insulationOtherwise you would have trails through the insulationGood Luck
