I know this has been beaten to death here and I have read all the posts about this but I still have a couple of questions. I have a stock 318 with good compression in my 85 RC. This fall I need to be able to pull a 2 horse trailer (with horses) about 400 miles over a fairly decent range of mountains. I am on a very low budget but I have good mechanical abilities.
I currently have the stock 2 barrel carb. At the JY I found a q-jet carb for $50 and a stock cast iron 4 barrel manifold (probably from a 360) for $25. I know the ports are probably larger on the manifold than the ports on my 318 heads. I am still trying to identify which specific q-jet I have and then I'll rebuild it.
What I'd like to do is put on the q-jet with the cast iron manifold and probably put in a better cam (suggestions?) and a new/better timing chain. Later I will put on 3" single exhaust and a high flow cat and muffler.
The questions are: Is the carb & manifold worth doing without either port matching the heads or getting different heads? Will the 3" exhaust be worth doing without headers? Does a new cam require new value springs? Is there anyway to change value springs without pulling the heads?
Thanks,
d.t.
I currently have the stock 2 barrel carb. At the JY I found a q-jet carb for $50 and a stock cast iron 4 barrel manifold (probably from a 360) for $25. I know the ports are probably larger on the manifold than the ports on my 318 heads. I am still trying to identify which specific q-jet I have and then I'll rebuild it.
What I'd like to do is put on the q-jet with the cast iron manifold and probably put in a better cam (suggestions?) and a new/better timing chain. Later I will put on 3" single exhaust and a high flow cat and muffler.
The questions are: Is the carb & manifold worth doing without either port matching the heads or getting different heads? Will the 3" exhaust be worth doing without headers? Does a new cam require new value springs? Is there anyway to change value springs without pulling the heads?
Thanks,
d.t.