First off, the car specs:
Dodge Mirada 1983
318cid (stock) / 904 / stock 8.25 diff.
I have been rebuilding the engine for street and leisure cruising (the whole car actually) and so far I have done/bought these:
-Cylinders bored 0.02"
-New pistons 0.02" oversize
-Crankshaft polished (stock size)
-Bearing surfaces polished
-New cam/crank bearings
The heads/cam:
-Bought: Comp Cams xe256h (20-221-3)
-New lifters, push rods, timing kit etc.
-The heads (other one at least) had this number stamped: 4027183? (looks like 4027188...)
-Took the heads to shop
Original Carter Thermoquad
Original 4-barrel intake
For the heads the mechanic/owner (who has built many street and racing engines) recommended milling, new valves (stock 1.75" / 1.5"), new valve guides and grinding the exhaust side ports larger for better performance.
Here the problems begun:
The shop has been making up excuses for why the heads are not done (other projects, health issues...), it's been 10 months and now I called and told I'll fetch them back and go elsewhere.
The questions which have risen:
-Is the recommended XE256H a good cam for stock engine?
-Does it need new valve springs?
-Are the stock heads good enough? The small exhaust ports are my biggest concern. Should I look for other heads? Try to get someone else do the grinding as the previous shop promised? Or are they good as they are? Of course new valves, guides and milling the surface will be done.
-I read the (Grand Cherokee) Magnum exhaust manifolds should flow a lot better. And if they would be out of a 93-95 G.C. they don't interfere with the firewall unlike the 96-98 and for example Pick-up ones.
-Is there anything to gain with better exhaust (manifold) with stock small exhaust port heads?
I had really readied for refurbing the heads, not buy new ones.
Sorry for long post, but I am lost with the subject...
Dodge Mirada 1983
318cid (stock) / 904 / stock 8.25 diff.
I have been rebuilding the engine for street and leisure cruising (the whole car actually) and so far I have done/bought these:
-Cylinders bored 0.02"
-New pistons 0.02" oversize
-Crankshaft polished (stock size)
-Bearing surfaces polished
-New cam/crank bearings
The heads/cam:
-Bought: Comp Cams xe256h (20-221-3)
-New lifters, push rods, timing kit etc.
-The heads (other one at least) had this number stamped: 4027183? (looks like 4027188...)
-Took the heads to shop
Original Carter Thermoquad
Original 4-barrel intake
For the heads the mechanic/owner (who has built many street and racing engines) recommended milling, new valves (stock 1.75" / 1.5"), new valve guides and grinding the exhaust side ports larger for better performance.
Here the problems begun:
The shop has been making up excuses for why the heads are not done (other projects, health issues...), it's been 10 months and now I called and told I'll fetch them back and go elsewhere.
The questions which have risen:
-Is the recommended XE256H a good cam for stock engine?
-Does it need new valve springs?
-Are the stock heads good enough? The small exhaust ports are my biggest concern. Should I look for other heads? Try to get someone else do the grinding as the previous shop promised? Or are they good as they are? Of course new valves, guides and milling the surface will be done.
-I read the (Grand Cherokee) Magnum exhaust manifolds should flow a lot better. And if they would be out of a 93-95 G.C. they don't interfere with the firewall unlike the 96-98 and for example Pick-up ones.
-Is there anything to gain with better exhaust (manifold) with stock small exhaust port heads?
I had really readied for refurbing the heads, not buy new ones.
Sorry for long post, but I am lost with the subject...
