Quote:
Originally Posted by 1QWIKBIRD
Matt,
What is your budget to get the motor completed? Without knowing your budget, this is all window dressing. You need to clearly define the budget and stay within it. Otherwise it can and will become a slipperly slope to no where land.....I also think you need to have someone with more experience than yourself look over the bottom end. Did you run a leak down test or at least a compression test prior to popping the heads off? Without that info you have no verifiable way to know the general condition of the motor o ther than the previous owners word???. Can you see any cross hatch in the cylinder bores? Is there a carbon ridge at the top of the cylinders? Has the motor ever been rebuilt, meaning is it already 0.030 over?
I am not being difficult, but you need to know the condition of the bottom end, figure out what can be reused, then proceed with the rebuild. If you stab a nice cam in and bolt on a nice set of vortecs only to discover the bottom end has issues after your money is gone, where does that leave you?
The more homework you do know the more rewarding the outcome will be.
Without knowing your alloted budget, its kinda tough to make recommendations on heads, as that is the main expenditure. Everything else is pretty much a fixed cost, but heads can vary big time in $$$$.
At the very least, I would pop off the main caps and check the bearings for any signs of wear, same with a few of the rod caps. If all check out ok, and there was still some sign of cross hatch in the cylinders, then leave the bottom end alone for now. Money saved. Clean, the head mating surfaces thoroughly, but be gentle don't gouge or grind the surface. Use a composite type head gasket as they are more forgiving if the surface is less than perfect. Run the heads that make sense for your budget, if iron vortecs meet your requirements then so be it. Cam (hyd. flat tappet like what has been suggested) to match the heads. Valvetrain (springs, retainers, pushrods, rockers) to match the cam and the intended rpm range. RPM airgap intake with an MSD 6AL to light the fire (has the rev limiter built in, chips are used to adjust) with the 750-800 cfm carb probably a vacuum secondary for use with the 700r4 and maybe a little bit more economy.
Emissions might be a little tough, but with the right timing and carb adjustment you should be ok.
400 are great motors, make great power. The stock 5.565 rods are kinda weak, but in a street motor they should be good to the occasional 6000 blast. If the short block did need attention, I'd immediatley go to a 5.7 rod/piston combo.
But without knowing the budget......its all.....well...just a guess
Chris
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Hi he being very young and not knowing little more than the BUZZ words he is not going to be able to understand exactly what you are talking about or do the kind of checking you corectly talked about, ( and they have him confused ) , its all well to have all these things heads cams what ever - but he has no idea what he is getting into and the more he reads the comic books ( super chevy ) and alike posts on sites who we all know are full of it -- the deaper into believing he needs all this stuff -- what happened to your first car HZHHZHHAHAH in a first car still two years away from getting to drive it -- if i and others were able to explain he first should only listen to one or 2 guys, who do this and follow the directions that make what he is trying to do -- smart choices -- the very first thing is to as has been said check the rotating assembly, it has dish pistons so compression w/ a 72 cc head is around 8 to 1 not going to be peppy with out smaller chamber or a flat piston top -- one of the better places to get stuff from is the place i use ---
www.competitionproducts.com --- or --
www.DougHerbert.com --
both will send paper catalogs and have very good pricing, jegs and summit are the K marts of the performance buzz and some of the cheap stuff they sell is seconds and thirds if you can believe their is a third --( JUNK ) sent back same set of heads 4 times till i got a set that dident have blems and still had to re do the valve job, and cut them flat -- but they were a good deal customer said -- jz