ogles824

We are working on my sons project K5 Blazer 4x4. It is an 88 model with the TBI system 350. In about 2 years it will be considered an antique, eligible for antique tags and exempt from any emmisions laws here in Texas so we are thinking about going to a tunnel ram and carbs and aluminum heads with a hyd. roller cam. This motor is all factory original and has the center valve cover bolt iron heads. We are wanting to put pre-87 style aluminum heads and a 383 claimer kit bottom end in it since basically this motor will just be to get it on and off the trailer and make a cruise night every once in a while and will never see any high rpm running at all. Will the old pre-87 heads fit this block? Will these blocks handle a .060 over bore ok even if we have a compression ratio between 11:1 and 12:1? Also I noticed that they make the rotating assemblies with either 5.7 or 6 inch rods. Why is there 2 different lengths?

fast75vega

you can use the old heads but yu will need to use the old style manifold too

ogles824

Thanks fast75vega, that's what we had in mind.....

hotrod1994

why run a tunnel ram ( even though im rather fond of them) , 11:1 , and aluminum heads on a trailer queen id go with cheaper iorn heads and like 9.5:1 for pump gas and flat tappet cam i dont see any sence in spending a bunch of money if it all gonna be all show and no go you can still make a beautiful looking car and have it still sound beefy with iorn heads and oem parts and cheaper non roller cam the comp cams thumpr cams have a great sound to them

just my opinion good luck with it though
-logan

ogles824

I may do a set of iron heads if I can get them at a reasonable price. Wouldn't mine running a set of the the World Products heads. I just like the aluminum units because I can shed some weight and get more out of the lift kit we are going to install. I love tunnel rams too...

hotrod1994

yeah i hear ya good luck man ill be looking for some pictures when you get her done