That article really has got me thinkin...maybe I won't even change the cam, just add 1.7 rockers. What do you think, 347, stock cam, 1.7's, GT-40P's, MAF, and a tune good for 300hp/350ftlbs?
I'm no expert Sloride
but I do know that 347s are notorious (amongst Chev-a-lay circles) for producing WAY more power than you'd think they could.
As jownes says(cautions) they're also notoriously mo' expensive and have mo' complications (to build) than a stock block.
I'm an 86er, like yersef' and I "knows" your pains with them raised crown pistons. Some parts guy did me a favour when I replaced my longblock in 99', by spec'ing me a later block with normal pistons and open chambered heads.
No question, if you want to use any other head than your closed chambered E6 heads, you can't re-use that 86' shortblock, with them raised crown pistons.
So, yes being an 86er, you're in for a new later shortblock. The good news is you can purchase a replacement shortblock 302 for just over a grand all day long.
You can also grab a later truck engine used for very low dough and have a local machine shop recondition it or do the machining and you can assemble it. You "may" beat the cost of a shortblock or you may just have fun doing it your way. Either way, getting a newer year shortblock is dirt cheap.
Couple that with ONLY those AFR-165 heads and NO OTHER changes and you just built a uber-reliable 5.0 litre with an extra 100 ft/lbs of torque (and hp) for pretty cheap.
A lot of guys here told me the speed density is up to the task, particularly if you stick with your stock truck cam. Not having to go MAF will save you a pile of dough, complexity and keep you bone stock reliable.
After you get it running "surf city fine" with your speed density, then do some research, ask some questions and then maybe add your 1.7s later.
One mod that I'm doing, after reading nuthin' but good things about, is going to the later 4 squirter hole injectors.
They atomize the fuel charge FAR better than our 86' single hole injectors and they "bolt-in".
Most people are claiming at least 20-25% more mileage, better performance and less clogging than the earlier design.
I got an entire set of 8 out of a 95 Mercury 4.6 for $22.00 for the set and aims to install em' in the Spring.
Do some mo' research before you buy a $600.00+ intake that only delivers 5% improvements.
BTW IIRC the 86' had 165 hp and 280 ft/lbs of torque as is. Add them AFRs and that takes you to 380 ft/bs of torque with just a head change........no real mods, no computer change, no big expenses, no change to reliability......food for thought.